INSTALLATION
INSTRUCTIONS
E20 Lennox Industries Inc.
Dallas, Texas, USA
Elite® Series XP16 Units
HEAT PUMPS
506640−01
12/10
These instructions are intended as a
Litho U.S.A.
general guide and do not supersede
local codes in any way. Consult
authorities having jurisdiction before
installation.
Supersedes 11/10
TABLE OF CONTENTS
Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification . . . . . . . . . . . . . . . . . . . .
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Parts Arrangement . . . . . . . . . . . . . . . . . . . . . .
Caps and Fasteners Torque Requirements . . . . . . . .
Operating Gauge Set and Service Valves . . . . . . . . .
Recovering Refrigerant from Existing System . . . . .
New Outdoor Unit Placement . . . . . . . . . . . . . . . . . . .
Removing and Installing Panels . . . . . . . . . . . . . . . . .
Line Set Requirements . . . . . . . . . . . . . . . . . . . . . . . . .
RETAIN THESE INSTRUCTIONS FOR FUTURE
REFERENCE
NOTICE TO INSTALLER
BRAZING LINE SET TO SERVICE VALVES
It is imperative to follow the brazing technique illustrated starting on
Indoor Refrigerant Metering Device Removal and
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
Servicing and Weighing In Refrigerant for Units
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HFCs, and HCFCs) as of July 1,
1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incarceration
may be levied for noncompliance.
Shipping and Packing List
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox XP16 Engineering Handbook.
Coils previously charged with HCFC−22 must be
flushed.
Check unit for shipping damage. Consult last carrier
immediately if damage is found.
1 − Assembled outdoor unit
General
The XP16 outdoor unit uses HFC−410A refrigerant. This
unit must be installed with a matching indoor blower coil
and line set as outlined in the XP16 Lennox Engineering
Handbook. Elite® Series outdoor units are designed for
use in check / expansion valve (CTXV) systems only and
are not to be used with other refrigerant flow control
devices. An indoor coil check / expansion valve approved
for use with HFC−410A must be ordered separately and
installed prior to operating the unit.
CAUTION
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
12/10
506640−01
Page 1
*2P1210*
*P506640-01*
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Typical Unit Parts Arrangement
FOR COIL SENSOR (RT21)
LOCATION SEE DETAIL A
COMPRESSOR
DUAL RUN CAPACITOR (C12)
(−024, −036 AND −048 ONLY)
SINGLE RUN CAPACITOR (C1)
(−060 ONLY)
DEMAND DEFROST
CONTROL (A108)
DISCHARGE LINE
SENSOR (RT28)
REVERSING
VALVE (L1)
TRUE SUCTION
PORT
HIGH PRESSURE
SWITCH (S4)
EXPANSION VALVE
SENSING BULB
CHECK /
EXPANSION
VALVE
LIQUID VALVE AND GAUGE
PORT / LIQUID LINE
CONNECTIONS
LIQUID LINE
BI−FLOW FILTER
DRIER
GROUND
LUG
LOW PRESSURE
SWITCH (S87)
SINGLE POLE
CONTACTOR
(K1)
AMBIENT
TEMPERATURE
SENSOR (RT13)
VAPOR VALVE AND GAUGE PORT /
SUCTION LINE CONNECTIONS
DETAIL A
XP16−048
COIL SENSOR − EIGHT HAIRPIN
UP FROM THE BOTTOM ON
INSIDE ROW.
XP16−036
XP16−060
COIL SENSOR −
SIXTH HAIRPIN UP
FROM THE BOTTOM
COIL SENSOR − NINTH
HAIRPIN UP FROM THE
BOTTOM ON INSIDE
ROW.
ON INSIDE ROW.
XP16−024
COIL SENSOR −THIRD
HAIRPIN DOWN FROM
THE TOP ON INSIDE
ROW.
Figure 1. Unit Parts Arrangement
Caps and Fasteners Torque Requirements
When servicing or repairing HVAC equipment and
components, ensure the fasteners are appropriately
fasteners.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc −
Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Table 1. Torque Requirements
Parts
Recommended Torque
Service valve stems are factory−torqued (from 9 ft−lbs for
small valves, to 25 ft−lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap
8 ft.− lb.
11 NM
2 NM
16 in.− lb.
28 in.− lb.
90 in.− lb.
8 ft.− lb.
3 NM
10 NM
11 NM
See the Lennox Service and Application Notes
Corp.0807−L5 (C−08−1) for further details and
information.
Page 3
XP16 SERIES
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Operating Gauge Set and Service Valves
USING MANIFOLD GAUGE SET
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
When checking the system charge, only use a manifold
gauge set that features low−loss anti−blow back fittings.
Manifold gauge set used for HFC−410A refrigerant
systems must be capable of handling the higher system
operating pressures. The manifold gauges should be rated
for:
OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for
refrigerant recovery, flushing, leak testing, evacuating,
weighing in refrigerant and optimizing system charge.
S
S
S
High side ꢀ Pressure range of 0 − 800 pound−force per
square inch gauge (psig)
Low side ꢀ Use with 30" vacuum to 250 psig with
dampened speed to 500 psig
Each valve is equipped with a service port which has a
factory−installed valve core. Figure 2 provides information
on how to access and operate both angle− and ball−type
service valves.
Manifold gauge set hoses must be rated for use to 800
psig of pressure with a 4000 psig burst rating.
Operating Angle−Type Service Valve:
1. Remove stem cap with an appropriately sized wrench.
INSERT HEX−HEAD
EXTENSION HERE
2
2. Use a service wrench with a hex−head extension (3/16" for liquid line valve sizes and 5/16"
for vapor line valve sizes) to back the stem out counterclockwise as far as it will go to open
the service valve.
SERVICE PORT CAP
TO INDOOR
UNIT
SERVICE PORT CORE
TO OUTDOOR
UNIT
SERVICE PORT
CORE
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
VALVE STEM
SHOWN
CLOSED
TO INDOOR
UNIT
REMOVE
STEM CAP
1
When service valve stem is in the CLOSED position,
the service port is open to the line set and indoor unit.
STEM CAP
TO OUTDOOR UNIT
To Access Service Port:
When service valve is OPEN, the service port is open to line set,
indoor and outdoor unit.
1/6 TURN
A service port cap protects the service port core from
contaminationand serves as the primary leak seal.
Operating Ball−Type Service Valve:
12
6
1
5
11
10
1. Remove service port cap with an appropriately sized
wrench.
2
1. Remove stem cap with an appropriately sized wrench.
2. Use an appropriately sized wrenched to open.
9
3
2. Connect gauge set to service port.
4
8
7
A
To open rotate stem
counterclockwise
90°.
3. When testing is completed, replace service port cap and
tighten as follows:
TO INDOOR UNIT
S
B
To close rotate stem
clockwise 90°.
S
Reinstall Stem Cap:
Without torque wrench: Finger tighten and use an appropriately sized
wrench to turn an additional 1/6 turn clockwise.
1/12 TURN
BALL (SHOWN CLOSED)
VALVE STEM
2
Stem cap protects the valve stem from damage and
serves as the primary seal. Replace the stem cap and
tighten as follows:
12
1
5
11
10
SERVICE PORT
2
SERVICE PORT CORE
SERVICE PORT CAP
9
3
S
S
With Torque Wrench: Finger tighten and then
4
8
7
6
Without Torque Wrench: Finger tighten and use an
REMOVE
STEM CAP
TO OUTDOOR UNIT
appropriatelysized wrench to turn an additional 1/12 turn clockwise.
1
NOTE ꢀ A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.
Figure 2. Angle and Ball−Type Service Valves
Page 4
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Recovering Refrigerant from Existing System
CONNECT MANIFOLD GAUGE SET
DISCONNECT POWER
Connect a manifold gauge set, clean recovery cylinder and a
recovery machine to the service ports of the existing unit..
Disconnect all power to the existing outdoor unit at the disconnect
switch and/or main fuse box/breaker panel.
2
1
NOTE ꢀ Use the recovery machine instructions to make
the correct manifold gauge set connections for recovery
refrigerant.The illustration below is a typical connection.
MAIN FUSE
BOX/BREAKER
PANEL
MANIFOLD GAUGES
DISCONNECT
SWITCH
RECOVERY MACHINE
LOW
HIGH
OUTDOOR UNIT
CLEAN RECOVERY
CYLINDER
RECOVERING REFRIGERANT
3
Remove existing HCFC−22 refrigerant using one of the following procedures:
METHOD 2 LIMITATIONS
METHOD 1:
Use Method 1 if the existing outdoor unit is not equipped with shut−off valves, or
if the unit is not operational and you plan to use the existing HCFC−22 to flush
the system.
NOTE ꢀ When using Method 2, the listed devices
below could prevent full system charge recovery into
the outdoor unit:
Recover all HCFC−22 refrigerant from the existing system using a recovery
machine and clean recovery cylinder. Check gauges after shutdown to confirm
that the entire system is completely void of refrigerant.
S
Outdoor unit’s high or low−pressure switches (if
applicable) when tripped can cycle the
compressor OFF.
S
S
Compressor can stop pumping due to tripped
internal pressure relief valve.
METHOD 2:
Use Method 2 if the existing outdoor unit is equipped with manual shut−off valves,
and you plan to use new HCFC−22 refrigerant to flush the system.
Compressor has internal vacuum protection that
is designed to unload the scrolls (compressor
stops pumping) when the pressure ratio meets a
certain value or when the suction pressure is as
high as 20 psig. (Compressor suction
pressuresshould never be allowed to go into
a vacuum. Prolonged operation at low suction
pressures will result in overheating of the
scrolls and permanent damage to the scroll
tips, drive bearings and internal seals.)
Perform the following task:
A
Start the existing HCFC−22 system in the cooling mode and close the liquid line
valve.
B
Use the compressor to pump as much of the existing HCFC−22 refrigerant into
the outdoor unit until the outdoor system is full. Turn the outdoor unit main power
OFF and use a recovery machine to remove the remaining refrigerant from the
system.
NOTE ꢀ It may be necessary to bypass the low pressure switches (if equipped) to
ensure complete refrigerant evacuation.
Once the compressor can not pump down to a lower
pressure due to any of the above mentioned system
conditions, shut off the vapor valve. Turn OFF the main
power to unit and use a recovery machine to recover
any refrigerant left in the indoor coil and line set.
C
D
When the low side system pressures reach 0 psig, close the vapor line valve.
Check gauges after shutdown to confirm that the valves are not allowing
refrigerantto flow back into the low side of the system.
Figure 3. Refrigerant Recovery
IMPORTANT
The Environmental Protection Agency (EPA) prohibits the intentional venting of HFC refrigerants during maintenance,
service, repair and disposal of appliance. Approved methods of recovery, recycling or reclaiming must be followed.
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.
Failure to follow this warning may result in personal injury or death.
Page 5
XP16 SERIES
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New Outdoor Unit Placement
If additional elevation is necessary, raise the unit by
extending the height of the unit support feet. This may be
achieved by using a 2 inch (50.8mm) schedule 40 female
threaded adapter.
CAUTION
In order to avoid injury, take proper precaution when lift-
ing heavy objects.
The specified coupling will fit snuggly into the recessed
portion of the feet. Use additional 2 inch (50.8mm)
Schedule 40 male threaded adaptors which can be
threaded into the female threaded adaptors to make
additional adjustments to the level of the unit.
Remove existing outdoor unit prior to placement of new
mounting slab, platforms or supports. Refer to figure 4 for
mandatory installation clearance requirements.
NOTE ꢀ Keep the height of extenders short enough to
ensure a sturdy installation. If it is necessary to extend
further, consider a different type of field−fabricated
framework that is sturdy enough for greater heights.
POSITIONING CONSIDERATIONS
Consider the following when positioning the unit:
S
Some localities are adopting sound ordinances based
on the unit’s sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line.
ROOF MOUNTING
Install the unit a minimum of 6 inches (152 mm) above the
roof surface to avoid ice build−up around the unit. Locate
the unit above a load bearing wall or area of the roof that
can adequately support the unit. Consult local codes for
mounting considerations.
S
When possible, do not install the unit directly outside
a window. Glass has a very high level of sound
transmission. For proper placement of unit in relation
to a window see the provided illustration in figure 5,
detail A.
PLACING UNIT ON SLAB
When installing unit at grade level, the top of the slab
should be high enough above grade so that water from
higher ground will not collect around the unit. The slab
should have a slope tolerance as described in figure 5,
detail B.
NOTICE
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil and cause the
rubber to swell when it comes into contact with oil. The
rubber will then bubble and could cause leaks. Protect
the roof surface to avoid exposure to refrigerant and oil
during service and installation. Failure to follow this
notice could result in damage to roof surface.
NOTE ꢀ If necessary for stability, anchor unit to slab as
ELEVATING THE UNIT
Units are outfitted with elongated support feet as illustrated
MINIMUM CLEARANCE
ABOVE UNIT
CLEARANCE ON ALL SIDES ꢀ INCHES (MILLIMETERS)
6 (152)
ACCESS PANEL
NOTES:
S
S
Clearance to one of the other three
sides must be 36 inches (914mm).
30 (762)
48 (1219)
12 (305)
Clearance to one of the remaining
two sides may be 12 inches
(305mm) and the final side may be
6 inches (152mm).
LINE SET
CONNECTIONS
36 (914)
MINIMUM CLEARANCE BETWEEN TWO UNITS
24
(610)
Figure 4. Installation Clearances
Page 6
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ꢀ Outside Unit Placement
DETAIL A
Install unit away from windows.
ꢀ Slab Mounting at Ground Level
DETAIL B
Install unit level or, if on a slope, maintain slope tolerance of two (2)
degrees (or two inches per five feet [50 mm per 1.5 m]) away from
building structure.
BUILDING
STRUCTURE
MOUNTING
SLAB
GROUND LEVEL
TWO 90° ELBOWS INSTALLED IN LINE SET WILL
REDUCE LINE SET VIBRATION.
Elevated Slab Mounting
DETAIL C ꢀ
ꢀ Slab Side Mounting
DETAIL D
using Feet Extenders
#10 1/2" LONG SELF−DRILLING
SHEET METAL SCREWS
COIL
STABILIZING BRACKET (18 GAUGE
METAL ꢀ 2" WIDTH; HEIGHT AS
REQUIRED)
BASE PAN
#10 1−1/4" LONG HEX HD SCREW
AND FLAT WASHER
CORNER POST
Concrete slab ꢀ use two plastic anchors (hole
drill 1/4")
BASE
Wood or plastic slab ꢀ no plastic anchor (hole
drill 1/8")
Stabilizing bracket (18 gauge metal ꢀ 2" (50.8mm) width; height as required); bend to form
right angle as exampled below.
LEG DETAIL
2" (50.8MM) SCH 40
FEMALE THREADED
ADAPTER
ꢀ Roof Top Mounting
DETAIL F
If unit coil cannot be mounted away from prevailing winter winds, a wind barrier should be
constructed. Size barrier at least the same height and width as outdoor unit. Mount barrier 24
inches (610 mm) from the sides of the unit in the direction of prevailing winds as illustrated.
2" (50.8MM) SCH 40
MALE THREADED
ADAPTER
PREVAILING WINTER WINDS
Use additional 2" SCH 40 male threaded adapters which
can be threaded into the female threaded adapters to
make additional adjustments to the level of the unit.
WIND BARRIER
INLET AIR
ꢀ Deck Top Mounting
DETAIL E
MINIMUM ONE
PER SIDE
One bracket per side
(minimum). For extra
INLET AIR
INLET AIR
stability, two brackets per
side, two inches (51mm)
from each corner.
SAME FASTENERS AS
SLAB SIDE MOUNTING.
FOR EXTRA
STABILITY
INLET AIR
Figure 5. Placement, Slab Mounting and Stabilizing Unit
Page 7
XP16 SERIES
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Removing and Installing Panels
LOUVERED PANEL REMOVAL
Remove the louvered panels as follows:
IMPORTANT! DO NOT ALLOW PANELS TO HANG ON UNIT BY TOP TAB. TAB IS FOR
ALIGNMENT AND NOT DESIGNED TO SUPPORT WEIGHT OF PANEL.
1. Remove two screws, allowing the panel to swing open
slightly.
PANEL SHOWN SLIGHTLY ROTATED TO ALLOW TOP TAB TO EXIT (OR
ENTER) TOP SLOT FOR REMOVING (OR INSTALLING) PANEL.
2. Hold the panel firmly throughout this procedure. Rotate
bottom corner of panel away from hinged corner post until
lower three tabs clear the slots as illustrated in detail B.
SCREW
HOLES
3. Move panel down until lip of upper tab clears the top slot in
corner post as illustrated in detail A.
LIP
LOUVERED PANEL INSTALLATION
Position the panel almost parallel with the unit as illustrated in
detail D with the screw side as close to the unit as possible.
Then, in a continuous motion:
Detail A
Detail B
1. Slightly rotate and guide the lip of top tab inward as
illustrated in detail A and C; then upward into the top
slot of the hinge corner post.
2. Rotate panel to vertical to fully engage all tabs.
3. Holding the panel’s hinged side firmly in place, close
the right−hand side of the panel, aligning the screw
holes.
4. When panel is correctly positioned and aligned, insert
the screws and tighten.
ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE
PANEL
HOLD DOOR FIRMLY TO THE HINGED
SIDE TO MAINTAIN
FULLY−ENGAGED TABS
ANGLE MAY BE TOO
EXTREME
Detail C
PREFERRED ANGLE
FOR INSTALLATION
Detail D
MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO
PARALLEL WITH THE UNIT AS POSSIBLE) WHILE
INSTALLING PANEL.
Figure 6. Removing and Installing Panels
WARNING
To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following:
While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause
injury to personnel, nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g.,
being bent or scratched).
While handling or stowing the panels, consider any weather conditions, especially windy conditions, that may cause
panels to be blown around and battered.
Page 8
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Line Set Requirements
This section provides information on: installation of new or
replacement line set.
S
S
Model (XP16) and size of unit (e.g. −036).
Line set diameters for the unit being installed as listed
S
S
S
Adding Polyol ester oil requirements
New or replacement line set installation
Using existing line set.
S
Number of elbows vertical rise or drop in the piping.
USING EXISTING LINE SET
ADDING POLYOL ESTER OIL REQUIREMENTS
Things to consider:
S
S
S
Liquid line that meter the refrigerant, such as RFC1
liquid line, must not be used in this application.
IMPORTANT
Mineral oils are not compatible with HFC−410A. If oil
must be added, it must be a Polyol Ester oil.
Existing line set of proper size as listed in table 2 may
be reused.
If system was previously charged with HCFC−22
refrigerant, then existing line set must be flushed (see
The compressor is charged with sufficient Polyol Ester oil
(POE) for line set lengths up to 50 feet. Recommend
adding oil to system based on the amount of refrigerant
charge in the system. Systems with 20 pounds or less of
refrigerant required no oil to be added.
If existing line set is being used, then proceed to Brazing
For systems over 20 pounds − add one ounce for every five
(5) pounds of HFC−410A refrigerant.
IMPORTANT
Recommended topping−off POE oils are Mobil EAL
ARCTIC 22 CC or ICI EMKARATEt RL32CF.
Lennox highly recommends changing line set when
converting the existing system from HCFC−22 to
HFC−410A. If that is not possible and the line set is the
proper size as reference in table 2, use the procedure
outlined under Flushing Line Set and Indoor Coil on page
13.
NEW OR REPLACEMENT LINE SET INSTALLATION
Field refrigerant piping consists of both liquid and vapor
lines from the outdoor unit to the indoor coil. Use Lennox
L15 (sweat, non−flare) series line set, or field−fabricated
refrigerant line sizes as specified in table 2.
IMPORTANT
If refrigerant lines are routed through a wall, then seal and
isolate the opening so vibration is not transmitted to the
building. Pay close attention to line set isolation during
installation of any HVAC system. When properly isolated
from building structures (walls, ceilings. floors), the
refrigerant lines will not create unnecessary vibration and
subsequent sounds. See figure 7 for recommended
installation practices.
If this unit is being matched with an approved line set
or indoor unit coil which was previously charged with
mineral oil, or if it is being matched with a coil which
was manufactured before January of 1999, the coil
and line set must be flushed prior to installation. Take
care to empty all existing traps. Polyol ester (POE) oils
are used in Lennox units charged with HFC−410A
refrigerant. Residual mineral oil can act as an
insulator, preventing proper heat transfer. It can also
clog the expansion device, and reduce the system
performance and capacity.
NOTE ꢀ When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, CORP. 9351−L9, or contact
Lennox Technical Support Product Applications for
assistance. To obtain the correct information from Lennox,
be sure to communicate the following information:
Failure to properly flush the system per the
instructions below will void the warranty.
Table 2. Refrigerant Line Set ꢀ Inches (mm)
Field Connections
Recommended Line Set
Model
Liquid Line
Suction Line
Liquid Line
Suction Line
L15 Line Set
XP16−024−230
XP16−036−230
XP16−048−230
XP16−060−230
3/8" (10 mm)
3/8" (10 mm)
3/8" (10 mm)
3/4" (19 mm)
3/8" (10 mm)
3/4" (19 mm)
L15−41 ꢀ 15 ft. − 50 ft. (4.6m − 15 m)
7/8" (22 mm)
3/8" (10 mm)
3/8" (10 mm)
7/8" (22 mm)
L15−65 ꢀ 15 ft. − 50 ft. (4.6 m − 15 m)
Field Fabricated
1−1/8" (29 mm)
1−1/8" (29 mm)
NOTE ꢀ Some applications may required a field provided 7/8" to 1−1/8" adapter
Page 9
XP16 SERIES
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Line Set Isolation ꢀ The following illustrations are examples of proper refrigerant line set isolation:
REFRIGERANT LINE SET ꢀ INSTALLING
VERTICAL RUNS (NEW CONSTRUCTION SHOWN)
REFRIGERANT LINE SET ꢀ TRANSITION
FROM VERTICAL TO HORIZONTAL
NOTE ꢀ Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperatureof the liquid line or when pressure drop is equal to or greater
than 20 psig.
ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE
AUTOMOTIVE
MUFFLER-TYPE HANGER
MUFFLER-TYPE HANGER
OUTSIDE WALL
LIQUID LINE
VAPOR LINE
WALL
STUD
WIRE TIE
INSIDE WALL
STRAP
WOOD BLOCK
BETWEEN STUDS
STRAP LIQUID LINE TO
VAPOR LINE
NON−CORROSIVE
METAL SLEEVE
WIRE TIE
LIQUID LINE
NON−CORROSIVE
METAL SLEEVE
WOOD BLOCK
WIRE TIE
VAPOR LINE − WRAPPED
IN ARMAFLEX
STRAP
REFRIGERANT LINE SET ꢀ INSTALLING
HORIZONTAL RUNS
SLEEVE
To hang line set from joist or rafter, use either metal strapping material
or anchored heavy nylon wire ties.
WIRE TIE (AROUND
VAPOR LINE ONLY)
VAPOR LINE WRAPPED
WITH ARMAFLEX
8 FEET (2.43 METERS)
OUTSIDE
WALL
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
FLOOR JOIST OR
LIQUID
LINE
ROOF RAFTER
TAPE OR
WIRE TIE
8 FEET (2.43 METERS)
PVC
PIPE
CAULK
NON−CORROSIVE
METAL SLEEVE
FIBERGLASS
INSULATION
STRAP THE VAPOR LINE TO THE JOIST
OR RAFTER AT 8 FEET (2.43 METERS)
INTERVALS THEN STRAP THE LIQUID
LINE TO THE VAPOR LINE.
TAPE OR
WIRE TIE
NOTE ꢀ Similar installation practices should be used if line set is
to be installed on exterior of outside wall.
FLOOR JOIST OR
ROOF RAFTER
Figure 7. Line Set Installation
Page 10
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Brazing Connections
WARNING
IMPORTANT
Polyol Ester (POE) oils used with HFC−410A
refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept closed
as much as possible. DO NOT remove line set caps
or service valve stub caps until you are ready to make
connections.
Allow braze joint to cool before removing the wet rag
from the service valve. Temperatures above 250ºF can
damage valve seals.
IMPORTANT
Use silver alloy brazing rods with 5% minimum silver
alloy for copper−to−copper brazing. Use 45% minimum
alloy for copper−to−brass and copper−to−steel brazing.
WARNING
Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing
torch to a pressurized system may result
in ignition of the refrigerant and oil
mixture − Check the high and low
pressures before applying heat.
WARNING
Fire, Explosion and Personal Safety
Hazard.
Failure to follow this warning could
result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause fire and/or an ex-
plosion, that could result in property
damage, personal injury or death.
WARNING
When using a high pressure gas such as
dry nitrogen to pressurize a refrigeration
or air conditioning system, use a
regulator that can control the pressure
down to 1 or 2 psig (6.9 to 13.8 kPa).
CAUTION
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well−ventilated
areas.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and flux.
Page 11
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CAP AND CORE REMOVAL
CUT AND DEBUR
Cut ends of the refrigerant lines square (free from nicks or dents)
and debur the ends. The pipe must remain round. Do not crimp end
of the line.
Remove service cap and core from
both the suction / vapor and liquid line
service ports.
2
1
CUT AND DEBUR
SERVICE PORT
CAP
SERVICE
PORT
CORE
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
SERVICE
PORT
CORE
SERVICE VALVE
CONNECTION
SERVICE
PORT CAP
COPPER TUBE
STUB
LIQUID LINE SERVICE
VALVE
SUCTION / VAPOR LINE
SERVICE VALVE
REDUCER
LINE SET SIZE IS SMALLER
THAN CONNECTION
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
REFRIGERANT LINE
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE
VALVES
3
Flow regulated nitrogen (at 1 to 2 psig) through the low−side refrigeration gauge set into the liquid line service port valve, and out of the suction /
vapor line service port valve.
A
B
C
Connect gauge set low pressure side to
liquid line service valve (service port).
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
LOW
HIGH
Connect gauge set center port to bottle of
nitrogenwith regulator.
Remove core from valve in suction / vapor
line service port to allow nitrogen to escape.
ATTACH
GAUGES
B
SUCTION / VAPOR SERVICE PORT MUST BE
OPEN TO ALLOW EXIT POINT FOR NITROGEN
SUCTION /
VAPOR LINE
SERVICE
VALVE
C
VAPOR LINE
OUTDOOR
UNIT
INDOOR
UNIT
NITROGEN
LIQUID LINE SERVICE
VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
LIQUID LINE
A
Figure 8. Brazing Procedures
WARNING
When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning
system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).
Page 12
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WRAP SERVICE VALVES
To help protect service valve seals during brazing, wrap water saturated cloths around service valve bodies and copper tube stubs. Use
additionalwater saturated cloths underneath the valve body to protect the base paint.
4
FLOW NITROGEN
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and
out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections
5
6
BRAZE LINE SET
Wrap both service valves with water saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Water
saturated cloths must remain water saturated throughout the brazing and cool−down process.
LIQUID LINE SERVICE VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
IMPORTANT ꢀ Allow braze joint to cool. Apply
additional water saturated cloths to help cool brazed
joint. Do not remove water saturated cloths until piping
has cooled. Temperatures above 250ºF will damage
valve seals.
WATER SATURATED
CLOTH
LIQUID LINE
WARNING
SUCTION / VAPOR LINE
SERVICE VALVE
1. FIRE, PERSONAL INJURY, OR PROPERTY
DAMAGE may result if you do not wrap a water
saturated cloth around both liquid and suction line
service valve bodies and copper tube stub while
brazing in the line set! The braze, when complete,
must be quenched with water to absorb any residual
heat.
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
2. Do not open service valves until refrigerant lines and
indoor coil have been leak−tested and evacuated.
Refer to procedures provided in this supplement.
SUCTION / VAPOR LINE
WATER SATURATED
CLOTH
PREPARATION FOR NEXT STEP
After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water saturated cloths to both
service valves to cool piping. Once piping is cool, remove all water saturated cloths.
7
Figure 9. Brazing Procedures (continued)
Page 13
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Indoor Refrigerant Metering Device Removal and Flushing Line Set and Indoor Coil
Flushing is only required when the existing system used HCFC−22 refrigerant. If the existing system used HFC−410a, then
remove the original indoor coil metering device and proceed to Installing New Indoor Metering Device on page 15.
TYPICAL EXISTING FIXED ORIFICE
REMOVAL PROCEDURE (UNCASED
COIL SHOWN)
TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)
OR
1B
1A
STUB END
TWO PIECE PATCH PLATE
(UNCASED COIL ONLY)
LIQUID LINE
ORIFICE
HOUSING
CHECK
EXPANSION
VALVE
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR
TUBES
®
TEFLON
RING
®
TEFLON RING
FIXED ORIFICE
BRASS NUT
®
TEFLON
RING
SENSING
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
ASSEMBLY
EQUALIZER
LINE
REMOVE AND DISCARD
®
WHITE TEFLON SEAL
(IF PRESENT)
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
A
B
On fully cased coils, remove the coil access and plumbing panels.
Remove any shipping clamps holding the liquid line and distributor as-
sembly.
MALE EQUALIZER
LINE FITTING
VAPOR
LINE
C
Using two wrenches, disconnect liquid line from liquid line orifice hous-
ing. Take care not to twist or damage distributor tubes during this pro-
cess.
LIQUID
LINE
SENSING BULB
A
B
On fully cased coils, remove the coil access and plumbing panels.
D
E
Remove and discard fixed orifice, valve stem assembly if present and
®
Teflon washer as illustrated above.
Remove any shipping clamps holding the liquid line and distributor
assembly.
Use a field−provided fitting to temporary reconnect the liquid line to the
indoor unit’s liquid line orifice housing.
C
Disconnect the equalizer line from the check expansion valve
equalizer line fitting on the vapor line.
D
E
Remove the vapor line sensing bulb.
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
Disconnect the liquid line from the check expansion valve at the liquid
line assembly.
2
INVERTED HCFC−22
GAUGE
MANIFOLD
F
Disconnect the check expansion valve from the liquid line orifice
housing.Take care not to twist or damage distributor tubes during this
process.
CYLINDER CONTAINS
CLEAN HCFC−22 TO BE
USED FOR FLUSHING.
A
®
G
H
Remove and discard check expansion valve and the two Teflon rings.
LOW
HIGH
1
Use a field−provided fitting to temporary reconnect the liquid line to the
indoor unit’s liquid line orifice housing.
NEW
OUTDOOR
UNIT
VAPOR LINE
SERVICE VALVE
FLUSHING LINE SET
OPENED
CLOSED
The line set and indoor unit coil must be flushed with at least the
same amount of clean refrigerant that previously charged the
system. Check the charge in the flushing cylinder before
proceeding.
EXISTING
INDOOR
UNIT
3
B
LIQUID LINE SERVICE
VALVE
A
Set the recovery machine for liquid recovery and start the
recovery machine. Open the gauge set valves to allow the
RECOVERY
CYLINDER
TANK
RETURN
rBecovery machine to pull a vacuum on the existing system line
set and indoor unit coil.
C
B
Invert the cylinder of clean HCFC−22 and open its valve to allow
liquid refrigerant to flow into the system through the vapor line
valve. Allow the refrigerant to pass from the cylinder and through
the line set and the indoor unit coil before it enters the recovery
machine.
INLET
D
DISCHARGE
RECOVERY MACHINE
A
Inverted HCFC−22 cylinder with clean refrigerant to the vapor service
valve.
C
D
After all of the liquid refrigerant has been recovered, switch the
recovery machine to vapor recovery so that all of the HCFC−22
vapor is recovered. Allow the recovery machine to pull down to 0
the system.
B
C
HCFC−22 gauge set (low side) to the liquid line valve.
HCFC−22 gauge set center port to inlet on the recovery machine with an
empty recovery tank to the gauge set.
Close the valve on the inverted HCFC−22 drum and the gauge
set valves. Pump the remaining refrigerant out of the recovery
machine and turn the machine off.
D
Connect recovery tank to recovery machines per machine instructions.
Figure 10. Removing Indoor Refrigerate Metering Device and Flushing Procedures
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Installing New Indoor Metering Device
This outdoor unit is designed for use in HFC−410A systems that use a check / expansion valve metering device (purchased
separately) at the indoor coil.
See the Lennox XP16 Engineering Handbook for approved check / expansion valve kit match−ups. The check / expansion
valve device can be installed either internal or external to the indoor coil. In applications where an uncased coil is being
installed in a field−provided plenum, install the check / expansion valve in a manner that will provide access for field servicing
1/2 Turn
A
B
Remove the field−provided fitting that temporarily
reconnectedthe liquid line to the indoor unit’s distributor
assembly.
INDOOR EXPANSION VALVE INSTALLATION
TWO PIECE
12
PATCH PLATE
(Uncased Coil Shown)
1
11
10
®
(UNCASED
STUB
END
2
Install one of the provided Teflon rings around the
stubbed end of the check / expansion valve and lightly
lubricate the connector threads and expose surface of
LIQUID LINE
ORIFICE
COIL ONLY)
9
3
CHECK /
EXPANSION
VALVE
4
8
HOUSING
5
7
®
6
DISTRIBUTOR
TUBES
the Teflon ring with refrigerant oil.
®
TEFLON
RING
C
D
E
Attach the stubbed end of the expansion valve to the
liquid line orifice housing. Finger tighten and use an
appropriatelysized wrench to turn an additional 1/2 turn
clockwise as illustrated in the figure above, or 20 ft−lb.
®
®
Place the remaining Teflon washer around the other
end of the check / expansion valve. Lightly lubricate
TEFLON
RING
SENSING
LINE
®
connector threads and expose surface of the Teflon
ring with refrigerant oil.
DISTRIBUTOR
ASSEMBLY
EQUALIZER
LINE
Attach the liquid line assembly to the check / expansion
valve. Finger tighten and use an appropriately sized
wrench to turn an additional 1/2 turn clockwise as
illustratedin the figure above or 20 ft−lb.
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
SENSING BULB INSTALLATION
A
Attach the vapor line sensing bulb in the proper
orientationas illustrated to the right using the clamp and
screws provided.
1/8 Turn
MALE EQUALIZER LINE
FITTING (SEE
VAPOR
LINE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
NOTE ꢀ Confirm proper thermal contact between vapor line
and expansion bulb before insulating the sensing bulb once
installed.
12
1
5
11
10
2
LIQUID LINE
9
3
4
8
B
Connect the equalizer line from the check / expansion
valve to the equalizer vapor port on the vapor line. Finger
tighten the flare nut plus 1/8 turn (7 ft−lbs) as illustrated
below.
7
Sensing bulb insulation is
required if mounted external to
the coil casing.
6
ON LINES SMALLER THAN
7/8", MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O’CLOCK POSITION.
VAPOR LINE
EQUALIZER LINE INSTALLATION
Remove and discard either the flare seal cap or flare nut with
copper flare seal bonnet from the equalizer line port on the vapor
line as illustrated in the figure to the right.
12
BULB
BULB
FLARE SEAL CAP
FLARE NUT
VAPOR LINE
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O’CLOCK
POSITION. NEVER MOUNT ON
BOTTOM OF LINE.
COPPER FLARE
SEAL BONNET
OR
12
MALE BRASS EQUALIZER
LINE FITTING
BULB
BULB
NOTE ꢀ NEVER MOUNT ON BOTTOM OF LINE.
VAPOR LINE
Figure 11. Installing Indoor Check / Expansion Valve
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Leak Test Line Set and Indoor Coil
IMPORTANT
Leak detector must be capable of sensing HFC refrigerant.
CONNECT GAUGE SET
A
Connect an HFC−410A manifold gauge set high pressure hose to the
vapor valve service port.
LOW
HIGH
MANIFOLD GAUGE SET
NOTE ꢀ Normally, the high pressure hose is connected to the liquid
line port. However, connecting it to the vapor port better protects the
manifoldgauge set from high pressure damage.
B
With both manifold valves closed, connect the cylinder of HFC−410A
refrigerantto the center port of the manifold gauge set.
OUTDOOR UNIT
NOTE ꢀ Later in the procedure, the
HFC−410A container will be replaced by
the nitrogen container.
A
B
TO VAPOR
SERVICE VALVE
NITROGEN
HFC−410A
Figure 12. Manifold Gauge Set Connections for Leak Testing
TEST FOR LEAKS
side of the manifold gauge set. Disconnect the
HFC−410A cylinder.
After the line set has been connected to the indoor and
outdoor units, check the line set connections and indoor
unit for leaks. Use the following procedure to test for leaks:
3. Connect a cylinder of dry nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set.
1. With both manifold valves closed, connect the cylinder
of HFC−410A refrigerant to the center port of the
manifold gauge set. Open the valve on the HFC−410A
cylinder (vapor only).
4. Adjust dry nitrogen pressure to 150 psig (1034 kPa).
Open the valve on the high side of the manifold gauge
set in order to pressurize the line set and the indoor unit.
2. Open the high pressure side of the manifold to allow
HFC−410A into the line set and indoor unit. Weigh in
a trace amount of HFC−410A. [A trace amount is a
maximum of two ounces (57 g) refrigerant or three
pounds (31 kPa) pressure]. Close the valve on the
HFC−410A cylinder and the valve on the high pressure
5. After a few minutes, open one of the service valve
ports and verify that the refrigerant added to the
system earlier is measurable with a leak detector.
6. After leak testing disconnect gauges from service
ports.
Page 16
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Evacuating Line Set and Indoor Coil
Evacuating the system of non−condensables is critical for proper operation of the unit. Non−condensables are defined as any
gas that will not condense under temperatures and pressures present during operation of an air conditioning system.
Non−condensables and water suction combine with refrigerant to produce substances that corrode copper piping and
compressor parts.
CONNECT GAUGE SET
NOTE ꢀ Remove cores from service valves (if not already done).
LOW
HIGH
1
A
Connect low side of manifold gauge set
with 1/4 SAE in−line tee to vapor line
service valve
B
C
D
Connect high side of manifold gauge
set to liquid line service valve
OUTDOOR
UNIT
MANIFOLD
GAUGE SET
A34000 1/4 SAE TEE WITH
SWIVEL COUPLER
Connect micron gauge available
connector on the 1/4 SAE in−line tee.
Connect the vacuum pump (with
vacuum gauge) to the center port of the
manifold gauge set. The center port
line will be used later for both the
HFC−410A and nitrogen containers.
A
500
MICRON
GAUGE
C
TO VAPOR
SERVICE VALVE
NITROGEN
HFC−410A
B
VACUUM PUMP
TO LIQUID LINE
SERVICE VALVE
D
EVACUATE THE SYSTEM
RECOMMEND
MINIMUM 3/8" HOSE
A
B
Open both manifold valves and start the vacuum pump.
Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).
2
NOTE ꢀ During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure
indicates a relatively large leak. If this occurs, repeat the leak testing procedure.
NOTE ꢀ The term absolute pressure means the total actual pressure within a given volume or system, above the absolute zero of
pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.
C
When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:
S
S
S
S
S
S
Close manifold gauge valves
Close valve on vacuum pump and turn off vacuum pump
Disconnect manifold gauge center port hose from vacuum pump
Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.
Open manifold gauge valves to break the vacuum in the line set and indoor unit.
Close manifold gauge valves.
D
E
Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the
dry nitrogen from the line set and indoor unit.
Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the
absolutepressure does not rise above 500 microns (29.9 inches of mercury) within a 20−minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
F
When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an
upright cylinder of HFC−410A refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and
indoor unit.
1/6 TURN
G
Perform the following:
S
S
S
S
Close manifold gauge valves.
Shut off HFC−410A cylinder.
12
1
5
11
7
2
4
10
Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core
tool while maintaining a positive system pressure.
9
3
8
Replace stem caps and secure finger tight, then tighten an additional one−sixth (1/6) of a turn as illustrated.
6
Figure 13. Evacuating Line Set and Indoor Coil
Page 17
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Electrical Connections
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to the furnace or air handler installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
WARNING
Danger of Equipment Damage. Avoid deep vacuum
operation. Do not use compressors to evacuate a
system. Extremely low vacuums can cause internal
arcing and compressor failure. Damage caused by
deep vacuum operation will void warranty.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air
handler for low-voltage control power (24VAC − 40 VA
minimum)
INSTALL THERMOSTAT
SIZE CIRCUIT AND INSTALL DISCONNECT
SWITCH
Install room thermostat (ordered separately) on an inside wall
2approximately in the center of the conditioned area and 5 feet
(1.5m) from the floor. It should not be installed on an outside wall
or where it can be affected by sunlight or drafts.
1
Refer to the unit nameplate for minimum circuit ampacity, and
maximum fuse or circuit breaker (HACR per NEC). Install power
wiring and properly sized disconnect switch.
THERMOSTAT
MAIN FUSE BOX/
BREAKER PANEL
DISCONNECT
SWITCH
5 FEET
(1.5M)
NOTE ꢀ 24VAC, Class II circuit connections are made in the control
panel.
NOTE ꢀ Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.
WARNING
Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and
local codes.
Line voltage is present at all components when unit is not in operation on units with single-pole contactors.
Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power
supplies.
Page 18
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HIGH VOLTAGE FIELD WIRING
LOW VOLTAGE CONNECTIONS
LOW VOLTAGE (24V) FIELD WIRING
3
WIRE RUN LENGTH
AWG# INSULATION TYPE
LESS THAN 100’ (30 METERS)
MORE THAN 100’ (30 METERS)
18
16
TEMPERATURE RATING
35ºC MINIMUM.
NOTE − For proper voltages, select thermostat wire (control wires)
gauge per table above.
NOTE − Do not bundle any excess 24VAC control wires inside
control box.
C
A
B
C
D
Run 24VAC control wires through cutout with grommet.
Run 24VAC control wires through wire tie.
Make 24VAC control wire connections.
Tighten wire tie to security 24V control wiring.
NOTE − Wire tie provides low voltage wire strain relief and to maintain
separation of field installed low and high voltage circuits.
CUTOUT WITH
A
GROMMET
TIGHTEN WIRE TIE
24V CONTROL WIRES
D
B
Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit as illustrated. See figures 14 and 15 for typical field
connections when connecting unit to either a CBX32MV or CBX40UHV in non−communicating mode. For connections to other Lennox air handlers
or furnaces, see the ComfortSense® 7000 installation instruction for further match component wiring illustrations.
HIGH VOLTAGE POWER SUPPLY CONNECTIONS
OUTDOOR UNIT
CONTROL BOX
4
GROUND
G
NOTE − Any excess high voltage field wiring
should be trimmed and secured away from
any low voltage field wiring.
L1
L2
NOTE − To facilitate a conduit, a cutout is lo-
cated in the bottom of the control box. Connect
conduit to the control box using a proper con-
duit fitting.
CONDUIT
CUTOUT
CONDUIT
Page 19
XP16 SERIES
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CBX32MV
OR
CBX40UHV
COMFORTSENSET
HEAT PUMP UNIT
(TWO−STAGE)
7000
X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOOR
TEMPERATURE DISPLAY, DEW POINT CONTROL, HEAT PUMP AND
DUAL FUEL BALANCE POINTS.
1
R
R
R
CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT # 47W97)
IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000
WITH THE LSOM 2.
2
W3
H
W2
W2
W1
O
3
FIELD PROVIDED JUMPER BETWEEN Y2 OUT BL ON HEAT PUMP
TO Y2 ON CBX40UHV.
1
W1
W1
O. D.
SENSOR
(X2658)
AIR
HANDLER
CONTROL
O
O
L
2
L
IMPORTANT − USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE CBX40UHV
INSTALLATION INSTRUCTION FOR FURTHER DETAILS.
Y1
Y1
Y2
Y1
Y2
G
Y1−Y2
2−STAGE
COMPR
CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE HP
CUT ON−BOARD LINK R −O.
G
Y2
OUT
BL
D
DS
Y2
3
R−O
HEAT
PUMP
T
T
B
C
R−DS
DEHUM
OR
C
C
CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
HARMONY
Figure 14. Typical Field Wiring ꢀ Heat Pump Application with CBX32MV or CBX40UHV
CBX32MV OR
CBX40UHV
COMFORTSENSEt
OUTDOOR UNIT
7000 THERMOSTAT
RED
RED
OUTDOOR
SENSOR
FAN RELAY (NOT REQUIRED
WITH SINGLE−SPEED
OUTDOOR FAN)
BLACK
PURPLE
T
T
PURPLE
(X2658)
BLACK
YELLOW
BLUE
BROWN (NOT USED FOR APPLICATIONS WITHOUT LSOM
BLUE (NOT REQUIRED FOR SINGLE STAGE)
AIR
HANDLER
CONTROL
IMPORTANT − USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE CBX40UHV
INSTALLATION INSTRUCTION FOR FURTHER DETAILS.
Y1−Y2
2−STAGE
COMPR
RESISTOR KIT (CAT # 47W97) IS REQUIRED
WHEN CONNECTING THE COMFORTSENSE
7000 WITH THE LSOM 2.
CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE A/C ONLY
CUT ON−BOARD LINK R −O.
R−O
HEAT
PUMP
R−DS
DEHUM
OR
CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION
TERMINAL IS USED.
HARMONY
®
Figure 15. Heat Pump Application ꢀ Humiditrol and Second−Stage Outdoor Fan Relay Wiring with
CBX32MV or CBX40UHV
Page 20
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Figure 16. Typical Unit Wiring Diagram (−024, −036 and −048 Only)
Page 21
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Figure 17. Typical Unit Wiring Diagram (−060 Only)
Page 22
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Figure 18. Typical Factory Wiring Diagram (No Field Modifications)
have consulted with the power company and the
voltage condition has been corrected.
Unit Start−Up
6. Open both the liquid and vapor line service valves to
release the refrigerant charge contained in outdoor
unit into the system.
IMPORTANT
If unit is equipped with a crankcase heater, it should be
energized 24 hours before unit start−up to prevent
compressor damage as a result of slugging.
preparation.
OPEN BOTH VAPOR AND LIQUID SERVICE
VALVE STEMS TO RELEASE
REFRIGERANT FROM OUTDOOR UNIT TO
SYSTEM.
UNIT START−UP
1. Rotate fan to check for binding.
2. Inspect all factory− and field−installed wiring for loose
connections.
3. Verify that the manifold gauge set is connected as
positioned near the liquid line service port as illustrated
subcooling method for optimizing the system
refrigerant charge.
NO
YES
GO TO SERVICE AND WEIGH
IN REFRIGERANT CHARGE
FOR OUTDOOR UNITS
DELIVERED VOID OF CHARGE
GO TO OPTIMIZING SYSTEM
REFRIGERANT CHARGE ON
4. Replace the stem caps and tighten to the value listed
in table 1.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit’s
nameplate. If not, do not start the equipment until you
Figure 19. Outdoor Unit Factory Charge
Page 23
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Service and Weigh In Refrigerant for Outdoor Units Delivered Void of Charge
The following procedures are only required if it has been determine that the new outdoor unit is void of charge. Skip to the
next section if refrigerant charge is present.
LEAK CHECK, REPAIR AND EVACUATE
2. Connect the manifold gauge set’s low pressure side to
the true suction port.
If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
3. Connect the manifold gauge set’s high pressure side
to the liquid line service port.
1. Leak check system using procedures provided on
4. Connect the center hose of the gauge set to acylinder
of HFC−410A and purge the hose. Then, place the
cylinder upside down on a scale.
2. Evacuate the system using procedure provided in
5. Check that fan rotates freely.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
6. Inspect all factory− and field−installed wiring for loose
connections.
4. Evacuate the system again using procedure in figure
12.
7. Open the high side manifold gauge valve and weigh in
liquid refrigerant. Use figure 20 in calculating the
correct weigh−in charge.
CONNECT MANIFOLD GAUGE SET AND WEIGH IN
CHARGE
8. Close manifold gauge valves.
9. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the bi−flow filter drier several times to achieve
the required dryness level. If system dryness is not
verified, the compressor will fail in the future.
After the evacuation procedure, reconnect the manifold
required for initial system weigh in charging.
1. Close manifold gauge set valves and connect the
center hose to a cylinder of HFC−410A. Set for liquid
phase charging.
10. Continue to Optimizing System Refrigerant Charge
subcooling method.
WEIGH−IN CHARGING
CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE
If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the unit. To calculate the total
refrigerantcharge:
Additional charge specified per indoor
Adjust amount. for variation in line set
length listed on line set length table below.
Amount specified on
nameplate
Total Charge
+
=
+
Refrigerant Charge per Line Set Length
OUNCES PER 5 FEET (G PER 1.5 M) ADJUST FROM 15 FEET
(4.6 M) LINE SET*
LIQUID LINE SET DIAMETER
3/8" (9.5 MM)
3 OUNCE PER 5’ (85 G PER 1.5 M)
*If line length is greater than 15 ft. (4.6 m), add this amount. If line length is less than 15 ft. (4.6 m), subtract
this amount.
NOTE ꢀ Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the temperature
of the liquid line or when pressure drop is equal to or greater than 20 psig.
NOTE ꢀ The above nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.
Figure 20. Using HFC−410A Weigh In Method
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MANIFOLD GAUGE SET
HIGH
LOW
GAUGE SET
B
CONNECTIONS FOR OPTIMIZING SYSTEM CHARGE
TRUE SUCTION PORT
CONNECTION
OUTDOOR UNIT
NOTE ꢀ Refrigerant tank should be
turned right−side−up to deliver vapor
during charge optimizing procedure.
REFRIGERANT
TANK
A
CHARGE IN
LIQUID PHASE
DIGITAL SCALE
TO LIQUID
LINE SERVICE
VALVE
TEMPERATURE SENSOR
(LIQUID LINE)
C
D
TEMPERATURE SENSOR (USE FOR
SUBCOOLING METHOD)
A
B
C
D
Close manifold gauge set valves and connect the center hose to a cylinder of HFC−410A. Set for liquid phase charging.
Connect the manifold gauge set’s low pressure side to the true suction port.
INSIDE OUTDOOR UNIT
Connect the manifold gauge set’s high pressure side to the liquid line service port.
Position temperature sensor on liquid line near liquid line service port (use only for subcooling method).
Figure 21. Gauge Set Connections for Adding Refrigerant
DISTRIBUTOR
OUTDOOR UNIT
NOTE − ARROWS INDICATE DIRECTION
OF REFRIGERANT FLOW
REVERSING VALVE
CHECK / EXPANSION
VALVE
OUTDOOR
COIL
INDOOR UNIT
BI−FLOW FILTER / DRIER
MUFFLER
TRUE SUCTION
PORT
VAPOR
SERVICE
PORT
LIQUID LINE
SERVICE PORT
COMPRESSOR
CHECK / EXPANSION VALVE
INDOOR
COIL
NOTE − Use gauge ports on vapor line valve and liquid valve for evacuating refrigerant lines and
indoor coil. Use true suction port to measure vapor pressure during charging.
Figure 22. Heat Pump Cooling Cycle
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Optimizing System Refrigerant Charge
This section provides instructions on optimizing the
system charge. This section includes:
efficiency. Make any air flow adjustments before
continuing with the optimizing procedure.
S
S
S
S
Optimizing procedure
Adjusting indoor airflow
Using subcooling method
5. Use subcooling method to optimize the system
ADJUSTING INDOOR AIRFLOW
Approved matched components, targeted subcooling
(SC) values and add charge values
Heating Mode Indoor Airflow Check
(Only use when indoor unit has electric heat)
S
Normal operating pressures
Temperature pressures
S
Indoor blower airflow (CFM) may be calculated by
energizing electric heat and measuring:
OPTIMIZING PROCEDURE
S
S
Temperature rise between the return air and supply air
temperatures at the indoor coil blower unit,
1. Move the low−side manifold gauge hose from the
vapor line service valve to the true suction port (see
Measuring voltage supplied to the unit,
S
Measuring amperage being drawn by the heat unit(s).
2. Set the thermostat for either cooling or heating
demand. Turn on power to the indoor unit and close
the outdoor unit disconnect switch to start the unit.
Then, apply the measurements taken in the following
formula to determine CFM:
Amps x Volts x 3.41
CFM =
1.08 x Temperature rise (F)
3. Allow unit to run for five minutes to allow pressures to
stabilize.
Cooling Mode Indoor Airflow Check
Check airflow using the Delta−T (DT) process using figure
23.
4. Check the airflow as instructed under Adjusting Indoor
Airflow to verify or adjust indoor airflow for maximum
ADJUSTING INDOOR AIRFLOW
DT
Temp.
of air
entering
indoor
coil ºF
1. Determine the desired DTꢀMeasure entering air temper-
ature using dry bulb (A) and wet bulb (B). DT is the intersect-
ing value of A and B in the table (see triangle).
80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
2. Find temperature drop across coilꢀMeasure the coil’s dry
bulb entering and leaving air temperatures (A and C). Tem-
A
perature Drop Formula: (T
) = A minus C.
Drop
Wet−bulb ºF
57 58 59 60 61 62 63 64 65 66 67 68 69 70
B
3. Determine if fan needs adjustmentꢀIf the difference between
the measured T and the desired DT (T –DT) is within
Drop
Drop
+3º, no adjustment is needed. See examples: Assume DT =
15 and A temp. = 72º, these C temperatures would necessi-
tate stated actions:
A
T
Drop
C
72º
19º
53º
Cº
T
–
DT
=
ºF ACTION
Drop
19
B
air flow
air flow
53º
58º
62º
–
–
–
15
15
15
=
=
=
4
Increase the airflow
DRY
BULB
DRY
BULB
64º
14
−1 (within +3º range) no change
10
−5 Decrease the airflow
WET
BULB
INDOOR
COIL
All temperatures are
expressed in ºF
4. Adjust the fan speedꢀSee indoor unit instructions to in-
crease/decrease fan speed.
Changing air flow affects all temperatures; recheck tempera-
tures to confirm that the temperature drop and DT are within
+3º.
Figure 23. Checking Airflow over Indoor Coil Using Delta−T Formula
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OPTIMIZE CHARGE USING SUBCOOLING METHOD
1. Check liquid and vapor line pressures. Compare pressures with either second−stage
guide and expect minor pressures variations. Significant pressure differences may
indicate improper charge or other system problem.
2. Decide whether to use cooling or heating mode based on current outdoor ambient
temperature:
USE
COOLING
MODE
A
Use COOLING MODE when:
60ºF
(15ºC)
S
S
Outdoor ambient temperature is 60°F (15.5°C) and above.
USE
HEATING
MODE
Indoor return air temperature range is between 70 to 80°F (21−27°C). This
temperature range is what the target subcooling values are base upon in
If indoor return air temperature is not within reference range, set thermostat to
cooling mode and a setpoint of 68ºF (20ºC). This should place the outdoor unit
into second−stage (high−capacity) cooling mode. When operating and
temperature pressures have stabilized, continue to step 3.
B
Use HEATING MODE when:
S
S
Outdoor ambient temperature is 59°F (15.0°C) and below.
Indoor return air temperature range is between 65−75°F (18−24°C). This
temperature range is what the target subcooling values are base upon in
If indoor return air temperature is not within reference range, set thermostat to
heating mode and a setpoint of 77ºF (25ºC). This should place the outdoor unit
into second−stage (high−capacity) heating mode. When operating and
temperature pressures have stabilized, continue to step 3.
3. Read the liquid line pressure; then find its corresponding temperature pressure listed
4. Read the liquid line temperature; record in the LIQº space to the left.
SATº
LIQº
SCº
5. Subtract LIQº temperature from SATº temperature to determine subcooling; record
it in SCº space to the left..
–
column), also consider any additional charge required for line set lengths longer than
15 feet and/or unit matched component combinations (Add Charge column).
=
7. If subcooling value is:
A
B
GREATER than shown for the applicable unit match component, REMOVE
refrigerant;
LESS than shown for the applicable unit match component, ADD refrigerant.
9. Close all manifold gauge set valves and disconnect gauge set from outdoor unit.
10. Replace the stem and service port caps and tighten as specified in Operating Service
11. Recheck voltage while the unit is running. Power must be within range shown on the
nameplate.
Figure 24. Using HFC−410A Subcooling Method ꢀ Second Stage (High Capacity)
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APPROVED MATCHED SYSTEM COMPONENTS, TARGETED SUBCOOLING (SC) VALUES AND
ADD CHARGE VALUES
Listed below are the approved matched system components (air handlers and indoor coils), targeted subcooling and
add charge values for the XP16. This information is also listed on the unit charging sticker located on the outdoor unit
access panel.
Subcooling values listed in the following tables are based
on outdoor ambient air temperature of:
Table 5. XP16−048−230
Heating
Mode
+5ºF
Cooling
Mode
+1ºF
*Add Charge
Indoor Air Handers
and Coils
S
S
60°F (15.5°C) and above for cooling mode
59°F (15.0°C) and below for heating mode.
Subcooling
lbs.
1
1
3
1
1
1
1
1
1
1
1
2
2
0
1
0
0
1
1
1
oz.
4
Table 3. XP16−024−230
CBX26UH−048−230
CBX27UH−048−230
CBX27UH−060−230
CBX32M−048
CBX32M−060
CBX32MV−048
CBX32MV−060
CBX32MV−068
CBX40UHV−048
CBX40UHV−060
CH23−68
10
19
13
19
14
19
14
9
8
9
Heating
Mode
+5ºF
Cooling
Mode
+1ºF
4
*Add Charge
Indoor Air Handers
and Coils
14
9
3
Subcooling
lb.
0
0
1
0
1
1
1
1
1
0
1
1
oz.
15
9
4
CBX26UH−024
CBX27UH−024−230
CBX27UH−030−230
CBX32MV−024/030
CBX32MV−036
CBX40UHV−024
CBX40UHV−030
CBX40UHV−036
CH33−31B
45
20
17
20
17
17
17
17
31
45
24
18
6
7
7
7
7
7
7
7
8
4
7
8
9
11
4
9
3
9
11
11
4
9
8
3
19
14
24
19
19
13
11
15
15
14
9
9
3
9
11
12
5
3
10
9
3
CH33−49C
12
0
CH33−50/60C
CH33−60D
9
5
CR33−30/36A/B/C
CX34−31A/B
8
0
11
10
CH33−62D
9
4
CX34−38A/B
CR33−50/60C
CR33−60D
7
10
10
0
Table 4. XP16−036−230
7
Heating
Mode
+5ºF
Cooling
Mode
+1ºF
CX34−60D
8
*Add Charge
Indoor Air Handers
and Coils
CX34−62D
9
6
Subcooling
lbs.
0
oz.
0
CX34−62C
8
9
9
CBX26UH−036
CBX27UH−036−230
CBX27UH−042−230
CBX32M−036
CBX32MV−036
CBX32MV−048
CBX40UHV−030
CBX40UHV−036
CBX40UHV−042
CBX40UHV−048
CH33−43B
50
22
24
22
22
24
22
22
24
24
13
37
37
49
29
29
5
7
Table 6. XP16−060−230
0
9
Heating
Mode
+5ºF
Cooling
Mode
+1ºF
*Add Charge
Indoor Air Handers
and Coils
11
7
3
0
0
9
Subcooling
lbs.
4
oz.
13
3
7
0
9
CBX26UH−060
CBX27UH−060−230
CBX32M−060
CBX32MV−060
CBX32MV−068
CBX40UHV−060
CH23−682
20
10
17
17
15
17
37
33
15
24
24
21
13
9
6
6
6
7
6
9
8
7
7
7
9
7
11
7
3
0
2
0
9
1
12
12
1
7
0
9
1
11
11
10
11
11
7
3
0
2
3
0
1
12
10
0
2
7
2
CH33−48C
2
11
11
9
CH33−50/60C
CH33−62D
1
CH33−43C
2
1
4
CR33−48B/C
0
CR33−50/60C
CR33−60D
0
0
CX34−43B/C
9
2
11
11
0
0
CX34−50/60C
9
2
CX34−62C
2
16
4
CX34−62D
1
*Amount of charge required in additional to charge shown on unit
nameplate. (Remember to consider line set length difference.)
Page 28
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NORMAL OPERATING PRESSURES
TEMPERATURE PRESSURES
Use the following tables to perform maintenance checks; it
is not a procedure for charging the system. Minor
variations in these pressures may be due to differences in
installations. Significant deviations could mean that the
system is not properly charged or that a problem exists
with some component in the system.
Compute subcooling by determining saturated
condensing temperature from temperature pressure
chart. Subtract from liquid temperature entering TXV.
Table 8. HFC−410A Temperature (°F) −
Pressure (Psig)
°F
Psig
°F Psig
°F Psig
°F Psig
Typical pressures only, expressed in psig (liquid +/− 10
and vapor +/− 5 psig); matched indoor component (air
handler or coil), indoor air quality, and indoor load will
cause the pressures to vary.
32
33
34
35
100.8
102.9
105.0
107.1
63
64
65
66
178.5
181.6
184.3
187.7
94
95
96
97
290.8
295.1
299.4
303.8
125
126
127
128
445.9
451.8
457.6
463.5
Table 7. Normal Operating Pressures*
Normal Operating Pressures − Cooling
XP16
−024
Vap
First Stage (Low Capacity) Pressure
−036
−048
−060
Liq
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
109.2
111.4
113.6
115.8
118.0
120.3
122.6
125.0
127.3
129.7
132.2
134.6
137.1
139.6
142.2
144.8
147.4
150.1
152.8
155.5
158.2
161.0
163.9
166.7
169.6
172.6
175.4
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
190.9
194.1
197.3
200.6
203.9
207.2
210.6
214.0
217.4
220.9
224.4
228.0
231.6
235.3
239.0
242.7
246.5
250.3
254.1
258.0
262.0
266.0
270.0
274.1
278.2
282.3
286.5
98
308.2
312.7
317.2
321.8
326.4
331.0
335.7
340.5
345.3
350.1
355.0
360.0
365.0
370.0
375.1
380.2
385.4
390.7
396.0
401.3
406.7
412.2
417.7
423.2
428.8
434.5
440.2
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
469.5
475.6
481.6
487.8
494.0
500.2
506.5
512.9
519.3
525.8
532.4
539.0
545.6
552.3
559.1
565.9
572.8
579.8
586.8
593.8
601.0
608.1
615.4
622.7
630.1
637.5
645.0
F
(C)**
Liq
Liq
Vap
Liq Vap
Vap
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
65
(18.3)
226
260
301
346
396
451
144
145
148
151
153
156
220
254
295
340
389
444
141
144
148
150
153
156
224
259
302
346
396
450
143
143
147
149
152
155
230
267
311
357
398
453
137
139
141
144
147
149
75
(23.9)
85
(29.4)
95
(35.0)
105
(40.6)
115
(46.1)
Second Stage (High Capacity) Pressure
65
(18.3)
241
279
321
369
421
480
140
142
144
146
148
151
232
269
312
346
409
465
129
136
140
142
145
148
238
278
321
372
424
481
138
140
142
144
147
149
232
276
320
367
421
479
131
133
136
138
141
144
75
(23.9)
85
(29.4)
95
(35.0)
105
(40.6)
115
(46.1)
Normal Operating Pressures − Heating
First Stage (Low Capacity) Pressure
50
(10)
312
330
112
130
350
372
115
136
336
363
114
135
385
414
108
126
60
(15.5)
Second Stage (High Capacity) Pressure
20
(−7.0)
299
312
325
344
358
64
79
321
347
367
387
395
61
74
289
294
321
341
361
57
69
332
349
361
383
425
59
67
30
(−1.0)
40
(4.4)
93
90
80
75
50
(10)
110
128
110
131
110
128
85
60
(15.5)
122
** Temperature of air entering outdoor coil.
Page 29
XP16 SERIES
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UNIT COMPONENTS
Demand Defrost Control (A108)
System Operation
The demand defrost control measures differential
temperatures to detect when the system is performing
poorly because of ice build−up on the outdoor coil. The
controller self−calibrates when the defrost system starts
and after each system defrost cycle. The demand defrost
IMPORTANT
Some scroll compressor have internal vacuum protector
that will unload scrolls when suction pressure goes
below 20 psig. A hissing sound will be heard when the
compressor is running unloaded. Protector will reset
when low pressure in system is raised above 40 psig. DO
NOT REPLACE COMPRESSOR.
S
S
S
Demand defrost control connections, jumpers and
This section addresses:
Demand defrost control connections, jumpers and
LED descriptions are listed on table 9.
S
S
Unit components (sensors, temperature switch,
pressure switches and demand defrost control)
Demand defrost control status, fault and lockout LEDs
Second−stage operation
TEST PINS (P1)
LOW AMBIENT
THERMOSTAT PINS
(P3)
DEFROST TERMINATION
PIN SETTINGS (P1)
SENSOR PLUG IN
(COIL AND
AMBIENT
SENSORS) (P4)
DIAGNOSTIC LEDS
(DS1 AND DS2)
DELAY PINS
(P5)
24V TERMINAL STRIP
CONNECTIONS (P2)
REVERSING VALVE
(O OUT)
PRESSURE SWITCH
CIRCUIT
CONNECTIONS
Note − Component locations vary by board manufacturer.
Figure 25. Demand Defrost Control (A108)
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Table 9. Demand Defrost Control (A108) Inputs, Outputs and Configurable Settings
Control Control Label or
Locations Description
Purpose
Function
P1
P1
TEST
Test Mode
See Test Mode on page 39 for further details.
which are: 50, 70, 90, and 100°F (10, 21, 32 and 38°C). The shunt
terminationpin is factory set at 50°F (10°C). If the temperature shunt is
not installed, the default termination temperature is 90°F (32°C).
Defrost Temperature
Termination Shunt (Jumper)
Pins
50, 70, 90, 100
24VAC Thermostat Input /
Output
W1
24VAC input / output from indoor thermostat to indoor unit.
C
24VAC Common
Thermostat Service Light
24VAC
24VAC common
L
Thermostat service light connection.
24VAC
P2
R
Y2
O
Thermostat Input
Thermostat Input
Thermostat Input
Controls the second stage operation of the unit.
Reversing valve solenoid.
Controls the operation of the unit.
Y1
Low Ambient Thermostat Provides selection of the Y2 compressor lock−in temperature. Valid
options are 40, 45, 50 and 55 degrees Fahrenheit.
P3
P4
55, 50, 45, 40
DIS−YEL
Pins
(P4−5) Ground connection for outdoor coil temperature sensor.
(P4−6) Connection for outdoor coil temperature sensor.
Coil Sensor
(P4−3) Ground connection for outdoor ambient temperature sensor.
(P4−4) Connection for outdoor ambient temperature sensor.
AMB−BLACK
Ambient Sensor
COIL−BROWN
Discharge Sensor
No discharge sensor is used; replaced by 10K resistor.
The demand defrost control has a field−selectable function to reduce
occasional sounds that may occur while the unit is cycling in and out of
the defrost mode. When a jumper is installed on the DELAY pins, the
compressor will be cycled off for 30 seconds going in and out of the
defrost mode. Units are shipped with jumper installed on DELAY pins.
P5
DELAY
Delay Mode
NOTE − The 30 second off cycle is NOT functional when TEST pins on
P1 are jumpered.
P6
TST, PS DF, C, R, O, Y1, Y2
RED LED
Factory Test Connectors
Diagnostic LED
No field use.
DS1
Valid states for demand defrost control two LEDs are OFF, ON and
FLASHING which indicate diagnostics conditions that are described in
DS2
GREEN LED
TWO CONNECTORS
O OUT
FAN
Condenser Fan Operation
24 VAC output
These two connections provide power for the condenser fan.
24 VAC output connection for reversing valve.
O OUT
When the low pressure switch trips, the demand defrost control will cycle
off the compressor, and the strike counter in the demand defrost control
will count one strike. The low pressure switch is ignored under the
following conditions:
S
during the defrost cycle and 90 seconds after the termination of
defrost
LO−PS
LO−PS
Low−Pressure Switch
S
S
S
when the average ambient sensor temperature is below 0°F (−18°C)
for 90 seconds following the start up of the compressor
during TEST mode
Y2 OUT
Y1 OUT
Y2 OUT
Y1 OUT
24 VAC Output
24 VAC output for second stage compressor solenoid.
24 VAC Common Output
24 VAC common output, switched for enabling compressor contactor.
When the high pressure switch trips, the demand defrost control will cycle
off the compressor, and the strike counter in the demand defrost control
will count one strike.
HS−PS
HS−PS
High−Pressure Switch
L
L
Service Light Output
24 Volt output
24VAC service light output.
24VAC typically used to supply power to the Lennox System Operation
Monitor (LSOM). Not used in this system.
24V
24V
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DEMAND DEFROST CONTROL (A108) DIAGNOSTIC LEDS
The state (Off, On, Flashing) of two LEDs on the demand defrost control (DS1 [Red] and DS2 [Green]) indicate diagnostics
Table 10. Demand Defrost Control (A108) Diagnostic LEDs
DS1 and DS2 System Status, Fault and Lockout Codes
DS2
Green
DS1
Red
Condition/Code
Possible Cause(s)
Solution
Type
1
Check control transformer power (24V).
If power is available to demand defrost con-
No power (24V) to demand
defrost control terminals R and C
or demand defrost control failure.
2
OFF
OFF
Status
Power problem
trol and LED(s) do not light, replace demand
defrost control.
Simultaneous
SLOW Flash
Unit operating normally or in
standby mode.
Status
Status
Normal operation
None required.
Alternating SLOW
Flash
Initial power up, safety trip, end of
room thermostat demand.
5−minuteanti−short cycle delay
None required (jumper TEST pins to override)
Sensor being detected open or shorted or out of temperature range. Demand defrost
control will revert to time/temperature defrost operation. (System will still heat or
cool).
Simultaneous
FAST Flash
Fault
Fault
Fault
Ambient Sensor Problem
Coil Sensor Problem
Sensor being detected open or shorted or out of temperature range. Demand defrost
control will not perform demand or time/temperature defrost operation. (System will
still heat or cool).
Alternating
FAST Flash
Indicates that demand defrost control has internal component failure. Cycle 24VAC
power to demand defrost control. If code does not clear, replace demand defrost
control.
Demand Defrost Control
Failure
ON
ON
1
Remove any blockages or restrictions from
coils and/or fans. Check indoor and outdoor
fan motor for proper current draws.
SLOW
Flash
1
OFF
OFF
Fault
Low Pressure Fault
Low Pressure Lockout
High Pressure Fault
High Pressure Lockout
Restricted air flow over indoor or
outdoor coil.
2
3
2
3
Improper refrigerant charge in
system.
Check system charge using subcooling
method.
ON
Lockout
Fault
Improper metering device
installed or incorrect operation
of metering device.
Check system operating pressures and
compare to unit subcooling tables in this
instruction or located on unit access panel.
SLOW
Flash
OFF
4
4
Incorrect or improper sensor
location or connection to
system.
Make sure all pressure switches and sensors
have secure connections to system to prevent
refrigerant leaks or errors in pressure and
temperaturemeasurements.
ON
OFF
ON
Lockout
Fault
SLOW
Flash
Discharge Line Temperature
Fault
This code detects shorted sensor or high discharge temperatures. If the discharge
line temperature exceeds a temperature of 285ºF (140ºC) during compressor
operation, the demand defrost control will de−energize the compressor contactor
output (and the defrost output if active). The compressor will remain off until the
discharge temperature has dropped below 225ºF (107ºC).
FAST
Flash
Discharge Line Temperature
Lockout
ON
Lockout
Fault
Fast
Flash
The demand defrost control detects open sensor or out of temperature sensor range.
This fault is detected by allowing the unit to run for 90 seconds before checking
sensor resistance. If the sensor resistance is not within range after 90 seconds, the
demanddefrost control will count one fault. After 5 faults, the demand defrost control
will lockout.
OFF
Discharge Sensor Fault
Fast
Flash
Discharge Sensor Lockout
OFF
Lockout
(Each fault adds 1 strike to that code’s counter; 5 strikes per code = LOCKOUT)
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High Pressure Switch (S4)
2. If the demand defrost control recognizes five
temperature sensor range faults during a single (Y1)
compressor demand, it reverts to a lockout mode and
displays the appropriate code. The demand defrost
control detects open sensor or out-of-temperature
sensor range. This fault is detected by allowing the unit
to run for 90 seconds before checking sensor
resistance. If the sensor resistance is not within range
after 90 seconds, the demand defrost control will count
one fault. After five faults, the demand defrost control
will lockout. Code on demand defrost control is
Discharge Sensor Fault and Lockout.
When the high pressure switch trips, the demand defrost
control will cycle off the compressor, and the strike counter
in the demand defrost control will count one strike. High
Pressure (auto reset) − trip at 590 psig, reset at 418.
Low Pressure Switch (S87)
When the low pressure switch trips, the demand defrost
control will cycle off the compressor, and the strike counter
in the demand defrost control will count one strike. Low
pressure switch (auto reset) − trip at 25 psig, reset at 40
psig.
The low pressure switch is ignored under the following
conditions:
The discharge line sensor, which covers a range of 150°F
(65°C) to 350°F (176°C), is designed to mount on a ½"
refrigerant discharge line.
S
S
S
S
During the defrost cycle and 90 seconds after the
termination of defrost
NOTE − Within a single room thermostat demand, if
5−strikes occur, the demand defrost control will lockout the
unit. demand defrost control 24 volt power R must be
cycled OFF or the TEST pins on demand defrost control
must be shorted between 1 to 2 seconds to reset the
demand defrost control.
When the average ambient sensor temperature is
below 15° F (−9°C)
For 90 seconds following the start up of the
compressor
During test mode
Crankcase Heater (HR1) and Crankcase Thermostat
Switch (S40)
Ambient Sensor (RT13)
The ambient sensor considers outdoor temperatures
below −35°F (−37°C) or above 120°F (48°C) as a fault. If the
ambient sensor is detected as being open, shorted or out
of the temperature range of the sensor, the demand
defrost control will not perform demand defrost operation.
The demand defrost control will revert to time/temperature
defrost operation and will display the appropriate fault
code. Heating and cooling operation will be allowed in this
fault condition.
The reference models are equipped with a 70 watt, belly
band type crankcase heater. HR1 prevents liquid from
accumulating in the compressor. HR1 is controlled by a
thermostat located on the liquid line. When liquid line
temperature drops below 50° F the thermostat closes
energizing HR1. The thermostat will open, de−energizing
HR1 once liquid line temperature reaches 70° F .
Liquid Line Bi−Flow Filter Drier
The unit is equipped with a large−capacity biflow filter drier
which keeps the system clean and dry. If replacement is
necessary, order another of like design and capacity. The
replacement filter drier must be suitable for use with
HFC−410A refrigerant.
Coil Sensor (RT21)
Coil SensorꢀThe coil temperature sensor considers
outdoor temperatures below −35°F (−37°C) or above 120°F
(48°C) as a fault. If the coil temperature sensor is detected
as being open, shorted or out of the temperature range of
the sensor, the demand defrost control will not perform
demand or time/temperature defrost operation and will
display the appropriate fault code. Heating and cooling
operation will be allowed in this fault condition.
The replacement filter drier must be suitable for use with
HFC−410A refrigerant.
SECOND−STAGE OPERATION
If the demand defrost control (A108) receives a call for
second−stage compressor operation Y2 in heating or
cooling mode and the first-stage compressor output is
active, the second-stage compressor solenoid output will
be energized.
High Discharge Temperature Sensor (RT28)
If the discharge line temperature exceeds a temperature of
285°F (140°C) during compressor operation, the demand
defrost control will de−energize the compressor contactor
output (and the defrost output, if active). The compressor
will remain off until the discharge temperature has dropped
below 225°F (107°C) and the 5-minute anti−short cycle
delay has been satisfied. This sensor has two fault and
lockout codes:
If first-stage compressor output is active in heating mode
and the outdoor ambient temperature is below the selected
compressor lock−in temperature, the second-stage
compressor solenoid output will be energized without the
Y2 input. If the jumper is not connected to one of the
temperature selection pins on P3 (40, 45, 50, 55°F), the
default lock−in temperature of 40°F (4.5°C) will be used.
1. If the demand defrost control recognizes five high
discharge line temperature faults during a single (Y1)
compressor demand, it reverts to a lockout mode and
displays the appropriate code. This code detects
shorted sensor or high discharge temperatures. Code
on demand defrost control is Discharge Line
Temperature Fault and Lockout.
The demand defrost control de−energizes the
second-stage compressor solenoid output immediately
when the Y2 signal is removed or the outdoor ambient
temperature is 5°F above the selected compressor lock−in
temperature, or the first-stage compressor output is
de−energized for any reason.
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If a pressure switch opens while the Y1 Out line is
engaged, a 5−minute short cycle will occur after the switch
closes.
Defrost System
This section addresses:
S
S
S
Emergency Heat
Demand Defrost Control Pressure Switch
Connections
Defrost System Overview
The unit’s automatic reset pressure switches (LO PS − S87
and HI PS − S4) are factory−wired into the demand defrost
control on the LO−PS and HI−PS terminals, respectively.
Defrost Control Connections, Jumper Settings and
Features
S
S
Operational Mode Overview (Calibration, Normal and
Defrost)
Demand Defrost Control Sensors
Sensors connect to the demand defrost control through a
field-replaceable harness assembly that plugs into the
the sensors, the demand defrost control detects outdoor
ambient, coil, and discharge temperature fault conditions.
As the detected temperature changes, the resistance
across the sensor changes.
Defrost Cycle Actuation
EMERGENCY HEAT (AMBER LIGHT)
An emergency heat function is designed into some room
thermostats. This feature is applicable when isolation of the
outdoor unit is required, or when auxiliary electric heat is
staged by outdoor thermostats. When the room thermostat is
placed in the emergency heat position, the outdoor unit
control circuit is isolated from power and field-provided relays
bypass the outdoor thermostats. An amber indicating light
simultaneously comes on to remind the homeowner that he
is operating in the emergency heat mode.
Testing Demand Defrost Control Sensors
Sensor resistance values can be checked by ohming
Table 11. Sensor Temperature /Resistance Range
Emergency heat is usually used during an outdoor unit
shutdown, but it should also be used following a power
outage if power has been off for over an hour and the
outdoor temperature is below 50°F (10°C). System should
be left in the emergency heat mode at least six hours to
allow the crankcase heater sufficient time to prevent
compressor slugging.
Pins/W
ire
Color
Temperature
Range °F (°C)
Resistance values
range (ohms)
Sensor
Outdoor
−35 (−37) to 120 (48) 280,000 to 3750
3 & 4
(Black)
Coil
−35 (−37) to 120 (48) 280,000 to 3750
5 & 6
(Brown)
DEFROST SYSTEM OVERVIEW
Discharge (if 24 (−4) to 350 (176) 41,000 to 103
applicable)
1 & 2
(Yellow)
The control monitors ambient temperature, outdoor coil
temperature, and total run time to determine when a
defrost cycle is required. The coil temperature probe is
designed withaspringcliptoallowmountingto theoutside
coil tubing. The location of the coil sensor is important for
proper defrost operation.
Note: Sensor resistance increases as sensed temperature decreases.
temperature changes for various types of sensors.
NOTE − When checking the ohms across a sensor, be
aware that a sensor showing a resistance value that is not
designed. However, if a shorted or open circuit is detected,
then the sensor may be faulty and the sensor harness will
need to be replaced.
NOTE − The demand defrost control accurately measures
the performance of the system as frost accumulates on the
outdoor coil. This typically will translate into longer running
time between defrost cycles as more frost accumulates on
the outdoor coil before the demand defrost control initiates
defrost cycles.
Defrost Temperature Termination Jumper
Settings (P1)
DEFROST CONTROL CONNECTIONS, JUMPERS
SETTINGS AND FEATURES
The demand defrost control selections are: 50, 70, 90, and
100°F (10, 21, 32 and 38°C). The shunt termination pin is
factory set at 50°F (10°C). If temperature shunt is not
installed, default termination temperature is 90°F (32°C).
Pressure Switch 5−Strike Lockout
The internal control logic of the demand defrost control
counts the pressure switch trips only while the Y1 (Input)
line is active. If a pressure switch opens and closes four
times during a Y1 (Input), the control logic will reset the
pressure switch trip counter to zero at the end of the Y1
(Input). If the pressure switch opens for a fifth time during
the current Y1 (Input), the control will enter a lockout
condition.
Test Pins (P1) Function
Placing the jumper on the field test pins (P1) allows the
technician to:
S
S
S
S
Clear short cycle lockout
Clear five−strike fault lockout
The 5−strike pressure switch lockout condition can be reset
by cycling OFF the 24−volt power to the demand defrost
control or by shorting the TEST pins between 1 to 2
seconds. All timer functions (run times) will also be reset.
Cycle the unit in and out of defrost mode
Place the unit in defrost mode to clear the coil
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Compressor Delay Mode (P5)
1. Frost Detection ꢀ If the compressor runs longer than
30 minutes and the actual difference between the clear
coil and frosted coil temperatures exceeds the
maximum difference allowed by the demand defrost
control, a defrost cycle will be initiated.
The demand defrost control has a field−selectable function
to reduce occasional sounds that may occur while the unit
is cycling in and out of the defrost mode. When a jumper is
installed on the DELAY pins, the compressor will be cycled
off for 30 seconds going in and out of the defrost mode.
Units are shipped with jumper installed on DELAY pins.
2. Time ꢀ If six hours of heating mode compressor run
time has elapsed since the last defrost cycle while the
coil temperature remains below 35°F (2°C), the
demand defrost control will initiate a defrost cycle.
NOTE − The 30 second off cycle is NOT functional when
jumpering the TEST pins.
OPERATIONAL MODE OVERVIEW
The demand defrost control has three basic operational
modes. Those modes are:
Actuation
When the reversing valve is de−energized, the Y1 circuit is
energized, and the coil temperature is below 35°F (2°C),
the demand defrost control logs the compressor run time.
If the demand defrost control is not calibrated, a defrost
cycle will be initiated after 30 minutes of heating mode
compressor run time. The control will attempt to
self−calibrate after this (and all other) defrost cycle(s).
1. Calibration Mode ꢀ The demand defrost control is
considered uncalibrated when power is applied to the
demand defrost control, after cool mode operation, or
if the coil temperature exceeds the termination
further details).
Calibration success depends on stable system
temperatures during the 20−minute calibration period. If
the demand defrost control fails to calibrate, another
defrost cycle will be initiated after 45 minutes of heating
mode compressor run time. Once the demand defrost
control is calibrated, it initiates a demand defrost cycle
when the difference between the clear coil and frosted coil
temperatures exceeds the maximum difference allowed
by the control or after six hours of heating mode
compressor run time has been logged since the last
defrost cycle.
2. Normal Mode ꢀ The demand defrost control
monitors the O line, to determine the system operating
mode (heat/cool), outdoor ambient temperature, coil
temperature (outdoor coil) and compressor run time to
determine when a defrost cycle is required.
Calibration of the demand defrost control occurs after
a defrost cycle to ensure that there is no ice on the coil.
During calibration, the temperature of both the coil and
the ambient sensor are measured to establish the
temperature differential which is required to allow a
defrost cycle.
Termination
3. Defrost Mode ꢀ The following paragraphs provide a
detailed description of the defrost system operation.
The defrost cycle ends when the coil temperature exceeds
the termination temperature or after 14 minutes of defrost
operation. If the defrost is terminated by the 14−minute
timer, another defrost cycle will be initiated after 30
minutes of run time.
DEFROST CYCLE ACTUATION
The demand defrost control initiates a defrost cycle based
on either frost detection or time.
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DEFROST CONTROL (A108) CALIBRATION MODE SEQUENCE
Occurs after power up and cooling operation, or if the coil temperature exceeds
the termination temperature while in Heat Mode.
Demand defrost control defaults to 30 minute ꢀ Time / Temperature Mode
Reset Compressor Runtime / Reset Three / Five Strike Counter
DEMAND MODE
THIRTY (30) MINUTE TIME /
TEMPERATURE MODE
45 MINUTE
TIME/TEMPERATURE MODE
Accumulate compressor runtime of
more than 30 minutes while coil
temperature is below 35° F (2°C).
When the accumulated compressor
time exceeds six (6) hours or if the
coil sensor indicates frost is present
on coil, go to Defrost.
Accumulate compressor runtime
while coil temperature is below 35° F
(2°C). When the accumulated
compressor time exceeds 30 minutes
go to Defrost.
Accumulate compressor runtime
while coil temperature is below 35°
F (2°C). When the accumulated
compressor time exceeds 45
minutes go to Defrost.
DEFROST
S
S
S
Outdoor Fan OFF
Reversing Valve ON
W1 line ON
Monitor coil temperature and
time in defrost mode.
HOW DID DEFROST TERMINATE?
Defrosted for 14−minute without the coil temperature
going above 35°F (2°C) for four (4) minutes and coil
did not reach termination temperature.
Coil temperature was above 35°F (2°C) for four (4)
minutes. of the 14−minute defrost OR reached
defrost termination temperature.
DEFROST TERMINATION
DEFROST TERMINATION
S
S
S
S
Compressor runtime counter RESET
Outdoor Fan ON
S
S
S
S
Compressor runtime counter RESET
Outdoor Fan ON
Reversing Valve OFF
W1 line OFF
Reversing Valve OFF
W1 line OFF
Attempt to Calibration ꢀ Temperature measurements are not taken for the first few minutes of each heat demand. This is
to allow coil temperatures to stabilize. demand defrost control has a maximum of 20 minutes of accumulated compressor
runtime in heat mode to calibrate demand defrost control This may involve more than one heating demand.
NO ꢀ Demand defrost control
reverts to 45 minute time
temperature.
Was stable coil temperature attained
within 20 minutes?
/
YES ꢀ Calibration occurred
Figure 26. Defrost Calibration
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Table 12. Ambient (RT13) and Coil (RT21) Sensors Temperature / Resistance Range
Degrees
Fahrenheit
Degrees
Fahrenheit
Degrees
Fahrenheit
Degrees
Fahrenheit
Resistance
Resistance
Resistance
Resistance
136.3
133.1
130.1
127.3
124.7
122.1
119.7
117.5
115.3
113.2
111.2
109.3
107.4
105.6
103.9
102.3
100.6
99.1
97.6
96.1
94.7
93.3
92.0
90.6
89.4
88.1
86.9
85.7
84.5
83.4
82.3
81.2
80.1
79.0
78.0
77.0
76.0
75.0
74.1
73.1
72.2
71.3
70.4
69.5
68.6
67.7
66.9
66.0
65.2
64.4
63.6
62.8
62.0
61.2
60.5
59.7
59.0
58.2
57.5
2680
2859
56.8
56.0
55.3
54.6
53.9
53.2
52.5
51.9
51.2
50.5
49.9
49.2
48.5
47.9
47.3
46.6
46.0
45.4
44.7
44.1
43.5
42.9
42.3
41.7
41.1
40.5
39.9
39.3
38.7
38.1
37.5
37.0
36.4
35.8
35.2
34.7
34.1
33.5
33.0
32.4
31.9
31.3
30.7
30.2
29.6
29.1
28.6
28.0
27.5
26.9
26.4
25.8
25.3
24.8
24.2
23.7
23.2
22.6
22.1
16657
16973
17293
17616
17942
18273
18607
18945
19287
19633
19982
20336
20695
21057
21424
21795
22171
22551
22936
23326
23720
24120
24525
24934
25349
25769
26195
26626
27063
27505
27954
28408
28868
29335
29808
30288
30774
31267
31766
32273
32787
33309
33837
34374
34918
35471
36031
36600
37177
37764
38359
38963
39577
40200
40833
41476
42130
42794
43468
21.6
21.0
20.5
20.0
19.4
18.9
18.4
17.8
17.3
16.8
16.3
15.7
15.2
14.7
14.1
13.6
13.1
12.5
12.0
11.5
11.0
10.4
9.9
44154
44851
45560
46281
47014
47759
48517
49289
50074
50873
51686
52514
53356
54215
55089
55979
56887
57811
58754
59715
60694
61693
62712
63752
64812
65895
67000
68128
69281
70458
71661
72890
74147
75431
76745
78090
79465
80873
82314
83790
85302
86852
88440
90068
91738
93452
95211
97016
98870
100775
102733
104746
106817
108948
111141
113400
115727
118126
120600
−11.3
−11.9
−12.6
−13.2
−13.9
−14.5
−15.2
−15.9
−16.5
−17.2
−17.9
−18.6
−19.3
−20.1
−20.8
−21.5
−22.3
−23.0
−23.8
−24.6
−25.4
−26.2
−27.0
−27.8
−28.7
−29.5
−30.4
−31.3
−32.2
−33.2
−34.1
−35.1
−36.1
−37.1
−38.2
−39.2
123152
125787
128508
131320
134227
137234
140347
143571
146913
150378
153974
157708
161588
165624
169824
174200
178762
183522
188493
193691
199130
204829
210805
217080
223677
230621
237941
245667
253834
262482
271655
281400
291774
302840
314669
327343
3040
3223
3407
3592
3779
3968
4159
4351
4544
4740
4937
5136
5336
5539
5743
5949
6157
6367
6578
6792
7007
7225
9.3
7444
8.8
7666
8.3
7890
7.7
8115
7.2
8343
6.7
8573
6.1
8806
5.6
9040
5.0
9277
4.5
9516
3.9
9757
3.4
10001
10247
10496
10747
11000
11256
11515
11776
12040
12306
12575
12847
13122
13400
13681
13964
14251
14540
14833
15129
15428
15730
16036
16345
2.8
2.3
1.7
1.2
0.6
0.0
−0.5
−1.1
−1.7
−2.2
−2.8
−3.4
−4.0
−4.6
−5.2
−5.7
−6.3
−6.9
−7.5
−8.2
−8.8
−9.4
−10.0
−10.6
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Table 13. High Discharge Sensor (RT28) Temperature / Resistance Range
Degrees
Fahrenheit
Degrees
Fahrenheit
Degrees
Fahrenheit
Degrees
Fahrenheit
Resistance
Resistance
Resistance
Resistance
303.1
298.1
293.4
289.0
284.8
280.9
277.1
273.6
270.2
267.0
263.9
260.9
258.1
255.3
252.7
250.1
247.7
245.3
243.0
240.8
238.6
236.5
234.4
232.4
230.5
228.6
226.7
224.9
223.2
221.5
219.8
218.1
216.5
214.9
213.4
211.9
210.4
208.9
207.5
206.0
204.6
203.3
201.9
200.6
199.3
198.0
196.8
195.5
194.3
193.1
191.9
190.7
189.5
188.4
187.2
183
195
207
220
232
245
258
270
283
297
310
323
336
350
364
378
391
405
420
434
448
463
478
492
507
523
538
553
569
584
600
616
632
649
665
682
698
715
732
750
767
785
803
821
839
857
876
894
913
932
952
971
991
1011
1031
186.1
185.0
183.9
182.8
181.8
180.7
179.6
178.6
177.6
176.6
175.5
174.6
173.6
172.6
171.6
170.6
169.7
168.7
167.8
166.9
165.9
165.0
164.1
163.2
162.3
161.4
160.5
159.7
158.8
157.9
157.1
156.2
155.3
154.5
153.6
152.8
152.0
151.1
150.3
149.5
148.7
147.9
147.1
146.2
145.4
144.6
143.8
143.0
142.3
141.5
140.7
139.9
139.1
138.3
137.6
1052
1072
1093
1114
1135
1157
1179
1201
1223
1245
1268
1291
1315
1338
1362
1386
1411
1435
1460
1486
1511
1537
1563
1590
1617
1644
1672
1699
1728
1756
1785
1815
1845
1875
1905
1936
1968
1999
2032
2064
2098
2131
2165
2200
2235
2270
2306
2343
2380
2418
2456
2495
2534
2574
2615
136.8
136.0
135.2
134.5
133.7
132.9
132.2
131.4
130.6
129.9
129.1
128.4
127.6
126.8
126.1
125.3
124.6
123.8
123.1
122.3
121.6
120.8
120.1
119.3
118.5
117.8
117.0
116.3
115.5
114.8
114.0
113.2
112.5
111.7
111.0
110.2
109.4
108.7
107.9
107.1
106.4
105.6
104.8
104.0
103.3
102.5
101.7
100.9
100.1
99.3
2656
2698
2740
2783
2827
2872
2917
2963
3010
3057
3105
3154
3204
3255
3307
3359
3413
3467
3523
3579
3637
3695
3755
3816
3877
3940
4005
4070
4137
4205
4274
4345
4418
4491
4567
4644
4722
4802
4884
4968
5054
5141
5231
5323
5416
5512
5610
5711
5814
5920
6028
6139
6253
6370
6489
94.5
93.6
92.8
92.0
91.2
90.3
89.5
88.6
87.8
86.9
86.0
85.2
84.3
83.4
82.5
81.6
80.7
79.8
78.8
77.9
76.9
76.0
75.0
74.1
73.1
72.1
71.1
70.0
69.0
68.0
66.9
65.8
64.7
63.6
62.5
61.3
60.2
59.0
57.8
56.6
55.3
54.0
52.7
51.4
50.0
48.6
47.2
45.7
6613
6739
6869
7002
7139
7281
7426
7575
7729
7888
8051
8220
8394
8574
8759
8951
9149
9354
9566
9786
10013
10250
10495
10749
11014
11289
11575
11873
12184
12509
12848
13202
13573
13961
14368
14796
15246
15719
16218
16744
17301
17891
18516
19180
19887
20641
21448
22311
98.5
97.7
96.9
96.1
95.3
Page 38
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TEST
PSlacing the jumper on the field test pins (P1) allows the technician to:
Clear short cycle lockout
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S
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Clear five−strike fault lockout
Cycle the unit in and out of defrost mode
Place the unit in defrost mode to clear the coil
WhenY1 is energized and 24V power is being applied to the Control, a test cycle can be initiated by placing a jumper on the Control’s TEST pins for 2 to
5 seconds. If the jumper remains on the TEST pins for longer than five seconds, the Control will ignore the jumpered TEST pins and revert to normal
operation.
The Control will initiate one test event each time a jumper is placed on the TEST pins. For each TEST the jumper must be removed for at least one
second and then reapplied.
Y1 Active
Place a jumper on TEST pins for
longer than one second but less
than two seconds.
Place a jumper on TEST pins for
more than two seconds.
Clears any short cycle lockout and
five strike fault lockout function, if
applicable.
Clears any short cycle lockout and
five strike fault lockout function, if
applicable.No other functions will be
executed and unit will continue in the
mode it was operating.
ACTIVE
INACTIVE
O Line Status
If in HEATING Mode
If in COOLING Mode
If in DEFROST Mode
The unit will terminate defrost and
enter HEAT MODE uncalibrated
with defrost timer set for 45 minute
test.
No further test mode operation will be
executed until the jumper is removed
from the TEST pins and reapplied.
If no ambient or coil sensor fault
exist, unit will go into DEFROST
MODE.
If ambient or coil faults exist (open or
shorted), unit will remain in HEAT
MODE.
If jumper on TEST pins remains in
place for more than five seconds.
If jumper on TEST pins is removed
before a maximum of five seconds.
NOTE ꢀ Placing a jumper on the TEST pins will not bring the unit
out of inactive mode. The only way manually activate the heat
pump from an inactive mode is to cycle the 24VAC power to the
Control.
The unit will remain in DEFROST
MODE until termination on time or
temperature.
The unit will return to HEAT MODE
un−calibrated with defrost timer set
for 34 minutes.
Figure 27. Test Pin (P1) Functions
Page 39
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12. After testing is complete, return unit to original set up.
Two−Stage Modulation Compressors
Checks
Maintenance
DEALER
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:
full-load capacity operation of two-stage modulation
compressors.
TOOLS REQUIRED
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S
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Refrigeration gauge set
Digital volt/amp meter
Outdoor Unit
1. Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
Electronic temperature thermometer
On-off toggle switch
2. Outdoor unit fan motor is pre−lubricated and sealed.
No further lubrication is needed.
3. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
IMPORTANT
4. Check all wiring for loose connections.
This performance check is ONLY valid on systems that
have clean indoor and outdoor coils, proper airflow over
coils, and correct system refrigerant charge. All
components in the system must be functioning proper to
correctly perform compressor modulation operational
check. (Accurate measurements are critical to this test
as indoor system loading and outdoor ambient can affect
variations between low and high capacity readings).
5. Check for correct voltage at unit (unit operating).
6. Check amp draw on outdoor fan motor.
Motor Nameplate:_________ Actual:__________.
7. Inspect drain holes in coil compartment base and
clean if necessary.
NOTE - If insufficient heating or cooling occurs, the unit
should be gauged and refrigerant charge should be
checked.
PROCEDURE
NOTE − Block outdoor coil to maintain a minimum of 375
psig during testing).
Outdoor Coil
It may be necessary to flush the outdoor coil more
frequently if it is exposed to substances which are
corrosive or which block airflow across the coil (e.g., pet
urine, cottonwood seeds, fertilizers, fluids that may contain
high levels of corrosive chemicals such as salts)
1. Turn main power OFF to outdoor unit.
2. Adjust room thermostat set point 5ºF above the room
temperature.
3. Remove control access panel. Install refrigeration
gauges on unit. Attach the amp meter to the common
(black wire) wire of the compressor harness. Attach
thermometer to discharge line as close as possible to
the compressor.
S
S
Outdoor Coil ꢀ The outdoor coil may be flushed with
a water hose.
Outdoor Coil (Sea Coast) ꢀ Moist air in ocean
locations can carry salt, which is corrosive to most
metal. Units that are located near the ocean require
frequent inspections and maintenance. These
inspections will determine the necessary need to wash
the unit including the outdoor coil. Consult your
installing contractor for proper intervals/procedures
for your geographic area or service contract.
4. Turn toggle switch OFF and install switch in series with
Y2 wire from room thermostat.
5. Cycle main power ON.
6. Allow pressures and temperatures to stabilize before
taking measurements (may take up to 10 minutes).
7. Record all of the readings for the Y1 demand.
Indoor Unit
1. Clean or change filters.
8. Close switch to energize Y2 demand. Verify power is
going to compressor solenoid.
2. Lennox blower motors are prelubricated and
permanently sealed. No more lubrication is needed.
9. Allow pressures and temperatures to stabilize before
taking measurements (may take up to 10 minutes).
3. Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
10. Record all of the readings with the Y1 and Y2 demand.
11. If temperatures and pressures change in the direction
noted in Two−Stage Modulation Compressor Field
properly modulating from low to high capacity. (If no
amperage, pressures or temperature readings
change when this test is performed, the compressor
is not modulating between low and high capacity and
replacement is necessary).
4. Belt Drive Blowers − Check belt for wear and proper
tension.
5. Check all wiring for loose connections.
6. Check for correct voltage at unit. (blower operating)
7. Check amp draw on blower motor.
Motor Nameplate:_________ Actual:__________.
Page 40
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Indoor Coil
1. Clean coil if necessary.
filter to dry completely before returning it to the unit or
grille.
2. Check connecting lines, joints and coil for evidence of
oil leaks.
NOTE ꢀ The filter and all access panels must be in place
any time the unit is in operation.
4. Indoor Unit ꢀ The indoor unit’s evaporator coil is
equipped with a drain pan to collect condensate
formed as your system removes humidity from the
inside air. Have your dealer show you the location of
the drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)
3. Check condensate line and clean if necessary.
HOMEOWNER
Cleaning of the outdoor unit’s coil should be performed by
a trained service technician. Contact your dealer and set
up a schedule (preferably twice a year, but at least once a
year) to inspect and service your outdoor unit. The
following maintenance may be performed by the
homeowner.
Thermostat Operation
See the thermostat homeowner manual for instructions on
how to operate your thermostat.
Heat Pump Operation
Your new Lennox heat pump has several characteristics
that you should be aware of:
IMPORTANT
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure of the
unit to treated water (i.e., sprinkler systems, soakers,
waste water, etc.) will corrode the surface of steel and
aluminum parts and diminish performance and longevity
of the unit.
S
Heat pumps satisfy heating demand by delivering
large amounts of warm air into the living space. This
is quite different from gas- or oil-fired furnaces or an
electric furnace which deliver lower volumes of
considerably hotter air to heat the space.
S
Do not be alarmed if you notice frost on the outdoor coil
in the winter months. Frost develops on the outdoor
coil during the heating cycle when temperatures are
below 45F (7C). An electronic control activates a
defrost cycle lasting 5 to 15 minutes at preset intervals
to clear the outdoor coil of the frost.
Outdoor Coil
The outdoor unit must be properly maintained to ensure its
proper operation.
S
S
S
Please contact your dealer to schedule proper
inspection and maintenance for your equipment.
S
During the defrost cycle, you may notice steam rising
from the outdoor unit. This is a normal occurrence. The
thermostat may engage auxiliary heat during the
defrost cycle to satisfy a heating demand; however,
the unit will return to normal operation at the
conclusion of the defrost cycle.
Make sure no obstructions restrict airflow to the
outdoor unit.
Grass clippings, leaves, or shrubs crowding the unit
can cause the unit to work harder and use more
energy.
Extended Power Outage
S
Keep shrubbery trimmed away from the unit and
periodically check for debris which collects around the
unit.
The heat pump is equipped with a compressor crankcase
heater which protects the compressor from refrigerant
slugging during cold weather operation.
Cleaning of the outdoor unit’s coil should be performed by
a trained service technician. Contact your dealer and set
up a schedule (preferably twice a year, but at least once a
year) to inspect and service your outdoor unit.
If power to your unit has been interrupted for several hours
or more, set the room thermostat selector to the
EMERGENCY HEAT setting to obtain temporary heat
without the risk of serious damage to the heat pump.
Routine Maintenance
In EMERGENCY HEAT mode, all heating demand is
satisfied by auxiliary heat; heat pump operation is locked
out. After a six-hour compressor crankcase warm-up
period, the thermostat can be switched to the HEAT setting
and normal heat pump operation may resume.
In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level.
1. Air Filter ꢀ Ask your Lennox dealer to show you
where your indoor unit’s filter is located. It will be either
at the indoor unit (installed internal or external to the
cabinet) or behind a return air grille in the wall or
ceiling. Check the filter monthly and clean or replace
it as needed.
Preservice Check
If your system fails to operate, check the following before
calling for service:
S
S
S
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Verify room thermostat settings are correct.
Verify that all electrical disconnect switches are ON.
Check for any blown fuses or tripped circuit breakers.
Verify unit access panels are in place.
2. Disposable Filter ꢀ Disposable filters should be
replaced with a filter of the same type and size.
NOTE ꢀ If you are unsure about the filter required for your
system, call your Lennox dealer for assistance.
Verify air filter is clean.
3. Reusable Filter ꢀ Many indoor units are equipped
with reusable foam filters. Clean foam filters with a
mild soap and water solution; rinse thoroughly; allow
If service is needed, locate and write down the unit
model number and have it handy before calling.
Page 41
XP16 SERIES
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Accessories
S
S
S
Lennox XP16 Engineering Handbook
Lennox Product Catalog
For update−to−date information, see any of the following
publications:
Lennox Price Book
Checklists
Two−Stage Modulation Compressors Field Operational Checklist
Expected results during Y2 demand
(Toggle switch On)
Unit Readings
Y1 − First-Stage
Y2 − Second-Stage
COMPRESSOR
Voltage
Same
Amperage
Higher
OUTDOOR UNIT FAN MOTOR
Amperage
Same or Higher
TEMPERATURE
Ambient
Same
Higher
Higher
Same
Lower
Outdoor Coil Discharge Air
Compressor Discharge Line
Indoor Return Air
Indoor Coil Discharge Air
PRESSURES
Suction (Vapor)
Liquid
Lower
Higher
Page 42
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XP16 Start−Up and Performance
Customer
Address
Serial
Indoor Unit Model
Outdoor Unit Model
Notes:
Serial
START UP CHECKS
RefrigerantType:
1st Stage: Rated Load Amps
2nd Stage: Rated Load Amps
Outdoor Unit Fan Full Load Amps
Actual Amps
Actual Amps
Rated Volts
Actual Volts
Actual Volts
2nd Stage
Rated Volts
1st Stage
Actual Amps:
COOLING MODE
Suction Pressure: 1st Stage:
Liquid Pressure: 1st Stage:
Supply Air Temperature: 1st Stage:
Temperature: Ambient:
2nd Stage:
2nd Stage:
2nd Stage:
Return Air:
System Refrigerant Charge (Refer to manufacturer’s information on unit or installation instructions for required subcooling and approach tempera-
tures.)
A
A
A
B
B
B
SUBCOOLING
Subcooling:
ꢀ
ꢀ
ꢀ
=
=
=
Saturated Condensing Temperature (A) minus Liquid
Line Temperature (B)
APPROACH
Approach:
Liquid Line Temperature (A) minus Outdoor Air
Temperature (B)
COIL TEMP DROP
Indoor Coil Temperature Drop (18 to 22°F)
Return Air Temperature (A) minus Supply Air
Temperature (B)
Page 43
XP16 SERIES
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