INSTALLATION MANUAL
ISO 9001
MODULAR
NON-VARIABLE SPEED AIR HANDLERS
Certified Quality
Management System
MODELS: MA
LIST OF SECTIONS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ELECTRIC HEATER INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 5
LOW VOLTAGE CONTROL CONNECTIONS . . . . . . . . . . . . . . . . . . 5
REQUIRED CONTROL SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
LINE POWER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
BLOWER SPEED CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . .8
UNIT DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
LIST OF FIGURES
Typical Installation with MC or FC Evaporator Coil . . . . . . . . . . . . . . . 3
Coil and Air Handler Attachment Details . . . . . . . . . . . . . . . . . . . . . . . 3
Dimensions & Duct Connection Dimensions . . . . . . . . . . . . . . . . . . . . 4
Typical Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Line Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
460V - Line Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Blower Speed Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
460V - Blower Speed Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Cooling Models with Electric Heat Wiring . . . . . . . . . . . . . . . . . . . . . .15
Two-Stage Cooling Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
LIST OF TABLES
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Low Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Fault Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Low Fan Control Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Blower Delays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Heat Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Physical and Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Data - Cooling Only (60 Hz) - 208/230 . . . . . . . . . . . . . . . . . 9
Electrical Data - Cooling Only (60 Hz) - 460 . . . . . . . . . . . . . . . . . . . . 9
Conversion Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Data - 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Data - (For Multi-Source Power Supply) -
Electrical Data - (For Single Source Power Supply) -
Copper Wire 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Electrical Data - 3 Ø - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . .11
Electrical Data - (For Multi-Source Power Supply) -
Copper Wire 3 Ø - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Electrical Data - (For Single Source Power Supply) -
Copper Wire 3 Ø - 208/230-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Electrical Data - 460-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Electrical Data - (For Single Source Power Supply) -
Copper Wire 3 Ø - 460-3-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Air Flow Data - 60 Hz Models (230 & 460 Volt) . . . . . . . . . . . . . . . . .13
Air Flow Data - 60 Hz Models (208 Volt) . . . . . . . . . . . . . . . . . . . . . .14
Copper Wire 1 Ø - 208/230-1-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
WARNING indicates a potentially hazardous situation, which, if not
avoided, could result in death or serious injury.
SECTION I: GENERAL
This modular air handler provides the flexibility for installation in any
upflow, downflow, or horizontal application. These versatile models may
be used for cooling or heat pump operation with or without electric heat.
CAUTION indicates a potentially hazardous situation, which, if not
avoided may result in minor or moderate injury. It is also used to
alert against unsafe practices and hazards involving only property dam-
age.
A BRAND LABEL (available from Distribution) may be applied to the
center of the blower access panel.
The unit can be positioned for bottom return air in the upflow position,
top return air in the downflow position, and right or left return in the hor-
izontal position.
Improper installation may create a condition where the operation of
the product could cause personal injury or property damage.
Improper installation, adjustment, alteration, service or mainte-
nance can cause injury or property damage. Refer to this manual
for assistance or for additional information, consult a qualified con-
tractor, installer or service agency.
Top and side power wiring and control wiring, accessible screw termi-
nals for control wiring and easy to install electric heaters all combine to
make the installation easy, and minimize installation cost.
SECTION II: SAFETY
This is a safety alert symbol. When you see this symbol on
labels or in manuals, be alert to the potential for personal
injury.
This product must be installed in strict compliance with the installa-
tion instructions and any applicable local, state, and national codes
including, but not limited to building, electrical, and mechanical
codes.
Understand and pay particular attention to the signal words DANGER,
WARNING, or CAUTION.
DANGER indicates an imminently hazardous situation, which, if not
avoided, will result in death or serious injury.
262675-UIM-A-0806
262675-UIM-A-0806
Horizontal Right
Horizontal Left
Up Flow
Down Flow
FIGURE 1: Typical Installation with MC or FC Evaporator Coil
DOWNFLOW AND HORIZONTAL CONVERSION
These air handler units are supplied ready to be installed in a upflow,
downflow and left or right hand horizontal position.
AIR HANDLER AND COIL DOWNFLOW
INSTRUCTIONS
1. Position blower casing over duct connection and secure such that
the supply air end of the blower is down.
If the unit is to be installed with an evaporator coil, refer to Figure 1 for
unit positioning information.
2. Apply neoprene gasket to return-air side of air handler.
3. Place coil casing over blower return opening.
TIE PLATE
NOTE: Tie plate and screws are provided with coils.
4. Attach tie plate to casings of air handler and coil using screws.
5. Remove blower access panel and coil filter door.
AIR HANDLER
6. Fasten duct flanges of coil to base of air handler with screws. See
Figure 2.
7. Secure base of air handler to base of coil using screws.
8. Complete electrical and blower speed connections as outlined in
other sections of this document.
COIL
COIL
9. Reposition and replace blower access panel.
TOP PLATE
UPFLOW & HORIZONTAL
APPLICATIONS
DOWNFLOW
APPLICATION
Blowers with an electric heater kit may require a non-combustible
floor base if installing on a combustible floor. See instructions for
1FB1817, 1FB1821, & 1FB1824, and local codes.
AIR HANDLER
FIGURE 2: Coil and Air Handler Attachment Details
AIR HANDLER AND COIL UPFLOW AND
HORIZONTAL INSTRUCTIONS
1. Apply neoprene gasket to top of coil.
2. Position blower casing over coil opening.
NOTE: Tie plate and screws are provided with coils.
3. Attach tie plate to casings of air handler and coil using screws.
4. Remove blower access panel.
5. Fasten duct flanges of coil to duct flanges of air handler with
screws. See Figure 2.
6. Secure base of air handler to top of coil using screws.
7. Complete electrical and blower speed connections as outlined in
other sections of this document.
8. Reposition and replace blower access panel.
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J
E
10-3/8”
K
A
TOP OUTLET
DIMENSIONS
CIRCUIT BREAKER
PANEL
22”
B
D
20-1/2”
BOTTOM INLET
DIMENSIONS
FIGURE 3: Dimensions & Duct Connection Dimensions
TABLE 1: Dimensions
Wiring Knockouts1
Dimensions
MA
MODELS
A
B
D
E
J
K
Height
Width
17-1/2
17-1/2
24-1/2
21
Power
Control
08B
12B
16-1/2
16-1/2
23-1/2
20
14-19/32
14-19/32
21-19/32
18-3/32
7/8” (1/2”)
1 3/8” (1”)
1 23/32” (1 1/4”)
14D
16C
20D
25
7/8” (1/2”)
24-1/2
23-1/2
21-19/32
1. Actual size (Conduit size).
The supply air duct should be properly sized by use of a transition to
match unit opening. All ducts should be suspended using flexible hang-
ers and never fastened directly to the structure. This unit is not
designed for non-ducted (freeblow) applications. Size outlet plenum or
transition to discharge opening sizes shown in Figure 3.
DUCT CONNECTORS
Use 1/2" screws to connect ductwork to bottom of unit. Longer
screws will pierce the drain pan and cause leakage. If pilot holes
are drilled, drill only though field duct and unit bottom flange.
Duct work should be fabricated and installed in accordance with local
and/or national codes. This includes the standards of the National Fire
Protection Association for Installation of Air-Conditioning and Ventilat-
ing Systems, NFPA No. 90B.
Air supply and return may be handled in one of several ways best
suited to the installation. See Figure 3 for dimensions for duct inlet and
outlet connections.
AIR FILTERS
The vast majority of problems encountered with combination heating
and cooling systems can be linked to improperly designed or installed
duct systems. It is therefore highly important to the success of an instal-
lation that the duct system be properly designed and installed.
Air filters and filter racks must be field supplied.
.
Use flexible duct collars to minimize the transmission of vibration/noise
into the conditioned space. If electric heat is used, non-flammable
material must be used.
Equipment should never be operated without filters.
SUSPENSION KITS
Where return air duct is short, or where sound may be a problem,
sound absorbing glass fiber should be used inside the duct. Insulation
of duct work is a must where it runs through an unheated space during
the heating season or through an uncooled space during the cooling
season. The use of a vapor barrier is recommended to prevent absorp-
tion of moisture from the surrounding air into the insulation.
A suspension kit is available. Models 1BH0601 (unit size 018-060) is
designed specifically for the units contained in this instruction (upflow
application only). For installation of these accessory kits, see the
instructions packed with the kit.
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HORIZONTAL SUSPENSION
For suspension of these units in horizontal applications, it is recom-
mended to use angle steel support brackets with threaded rods, sup-
porting the units from the bottom, at the locations shown in Figure 4.
SECTION IV: ELECTRIC HEATER
INSTALLATION
If the air handler requires electric heat, install the electric heat kit
according to the installation instructions included with the kit. After
installing the kit, mark the air handler nameplate to designate the heater
kit that was installed. If no heater is installed, mark the name plate
appropriately to indicate that no heat kit is installed.
SUSPENSION SUPPORT LOCATIONS FOR HORIZONTAL APPLICATIONS
The HEAT ENABLE jumper (See Figure 5) must be moved to the HEAT
position to enable operation of the heater.
MIN. 3/8”
THREADED ROD
Use only 4HK heater kits, as listed on Air Handler name plate and in
these Instructions. Use data from Tables 11 through 18 for information
on required minimum motor speed tap to be used for heating operation,
maximum over-current protection device required and minimum electri-
cal supply wiring size required for listed combination of Air Handler and
Heater Kit.
MIN. 1-1/2” x 1-1/2” Angle
Recommended length
26” minimum
with 2” clearance on
both sides of Air Handler
For Upflow, Downflow and Horizontal right hand applications the kits
can be installed without modification.
1-1/2
2
Field modification is required for Horizontal left-hand airflow application
only. Follow instructions with heater for modification.
YY
WW
XX
Dimension
XX
Units
(Nominal Tons)
1-1/2 - 3 Ton
3-1/2 - 5 Ton
WW
16”
YY
48”
22”
22”
24”
53” - 58”
FIGURE 4: Typical Horizontal Installation
EAC
RELAY OUTPUT
HUM OUT
RELAY OUTPUT
HEAT ENABLE
JUMPER
LOW FAN
RELAY OUTPUT
MODE JUMPER
HUM STAT JUMPER
FUSE
SPARE JUMPER
FIGURE 5: Control Board
Remove desired knockout and pierce foil faced insulation to allow wir-
ing to pass through. Use as small of a hole as possible to minimize air
leakage.
SECTION V: LOW VOLTAGE CONTROL
CONNECTIONS
The 24 volt power supply is provided by an internally wired low voltage
transformer which is standard on all models, However, if the unit is con-
nected to a 208 volt power supply, the low voltage transformer must be
rewired to the 208 volt tap. See the unit wiring label.
Install a 7/8” plastic bushing in the selected hole and keep low voltage
wiring as short as possible inside the control box.
To further minimize air leakage, seal the wiring entry point at the outside
of the unit.
Field supplied low voltage wiring can exit the unit on the top right hand
corner or the right hand side panel. Refer to Figure 3.
The field wiring is to be connected at the screw terminals of the control
board. Refer to Figures 10 & 11.
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NOTE: All wiring must comply with local and national electrical code
requirements. Read and heed all unit caution labels.
FUNCTIONALITY AND OPERATION
Jumper Positions
Heat Enable Jumper
NOTE: It is possible to vary the amount of electric heat turned on during
the defrost cycle of a heat pump. Standard wiring will only bring on the
first stage of electric heat during defrost. See Heat Output and Limit
Connections and Table 6 for additional information on heat during
defrost cycle.
The HEAT ENABLE jumper configures the control for heat kit operation.
The jumper must be in the HEAT position if a heat kit is installed with
the air handler.
With the jumper in the NO HEAT position, the control will not energize
the heat relay outputs or sense the limit switch input.
TABLE 2: Low Voltage Connections
Terminal Signal
Comment
If the jumper is not present, the control will operate as if the jumper is in
the HEAT position. If the jumper is not present and a heat kit is not
present, the control will sense an open limit condition and the blower
will run continuously.
R
G
24 VAC power (fused)
Continuous Fan operation
Second or full stage
compressor operation
Y/Y2
Y1
Hum Stat Jumper
First stage compressor
operation
Not used with outdoor units
having one stage compressors.
The HUM STAT jumper configures the control to monitor the humidity
switch input. With the jumper in the NO position, the control will ener-
gize the HUM terminal with 24 VAC continually. With the jumper in the
YES position, the control will monitor the HUM input to control the HUM
OUT output to control an external humidifier.
W2
W1
Second stage heat operation
First stage heat operation
24 VAC will be present at this
terminal when the MODE
jumper is in the AC position.
This is normal.
O
Reversing valve operation
Humidity switch input
If the jumper is not present, the control will operate as if the jumper is in
the YES position.
24 VAC will be present at this
terminal when the HUM STAT
jumper is in the NO position.
This is normal.
HUM
Mode Jumper
The MODE jumper configures the control to operate properly with an air
conditioner (AC position) or heat pump (HP position). With the jumper in
the AC position, the control will energize the O terminal with 24 VAC
continually. With the jumper in the HP position, the O input signal is
received from the room thermostat.
This terminal is a connection
point only and does not affect
air handler control operation.
Connection point for
heat pump fault indicator
X/L
COM
24 VAC common
The low voltage connections may be connected to the screw terminals
or the quick connect terminals. The screw terminals and the quick con-
nect terminals are physically connected on the control board.
If the jumper is not present, the control will operate as if the jumper is in
the HP position.
SPARE Jumper
HUMIDITY SWITCH INPUT
The control includes a spare jumper that can be used if a jumper is lost.
The SPARE jumper does not have any effect on the operation of the
control.
The air handler control is designed to work with a humidity control that
closes when the humidity is below the set-point. The control is open
when the humidity is above the set-point. This humidity control may be
referred to as a humidistat or a dehumidistat.
Status and Fault Codes
The control includes an LED that displays status and fault codes. These
codes are shown in Table 3. The control will display the fault codes until
power is removed from the control or the fault condition is no longer
present.
The humidity switch controls both humidification and de-humidification
operation of the control. The control provides humidification using the
HUM OUT relay output and de-humidification by lowering the blower
speed. This is accomplished using the LOW FAN output and a field
installed two-speed fan relay kit for non-variable speed models and the
de-humidification input of the motor for variable speed models. The
humidity switch should be connected to the R and HUM terminals of the
control. See Figures 10 & 11.
TABLE 3: Fault Codes
LED1 (RED)
Fault or Status Condition
Flash Code
Status
SECTION VI: REQUIRED CONTROL
SET-UP
No power to control
OFF
2s ON / 2s OFF
Rapid Flash
ON
Normal operation
IMPORTANT: The following steps must be taken at the time of installa-
Control in test mode
tion to insure proper system operation.
Control failure
1. Consult system wiring diagram to determine proper thermostat
wiring for your system.
Limit Faults
Limit switch currently open (not in lockout)
Multiple limit openings with no call for heat
Multiple limit openings during one call for heat
Single long duration limit opening
Multiple long duration limit openings
Fan failure
1
2
3
4
5
6
2. If heat kit is installed, change HEAT ENABLE jumper from NO
HEAT to HEAT position.
3. If a humidstat is installed, change HUM STAT jumper from NO to
YES.
4. Set the MODE jumper to A/C (Air Conditioner) or HP (Heat Pump)
position depending on the outdoor unit included with the system.
Wiring Related Faults
Simultaneous call for heating and cooling
Internal Control Faults
7
9
Control recovered from internal event
6
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262675-UIM-A-0806
Depending on the heat kit installed in the air handler, the control pro-
vides the flexibility to configure the amount of heat delivered with the
first stage heating call. As an example, when the control’s W1 input is
connected to the room thermostat’s first stage heat signal, a call for first
stage heat will energize one heating element (HT1). If the control’s W2
input is connected to the room thermostat’s first stage heat signal, a call
for first stage heat will energize two heating elements (HT1 & HT2).
With either configuration, the control will energize three heating ele-
ments (HT1, HT2, & HT3) when it receives a first and second stage
heat input from the thermostat.
External Relay Outputs
The control includes three outputs to drive external relays having 24
VAC coils. The outputs have a maximum rating of 1.0 Amp pilot duty at
24 VAC.
HUM OUT
The HUM OUT output can be used to drive an external relay or solenoid
(24 VAC coil) to control a humidifier. The output is energized when the
HUM input is energized, the HUM STAT is in the YES position, and the
control has a thermostat call for heating (heat pump or electric heat).
EAC
Limit Switch and Lockout Operation
Limit Switch Operation
The EAC output can be used to drive an external relay (24 VAC coil) to
control an electronic air cleaner. The output is energized whenever the
blower relay on the control is energized. Models having a high effi-
ciency non-variable speed motor use the EAC output as an input to the
motor. The EAC output can also be used to drive an electronic air
cleaner relay as long as the load of the EAC relay does not exceed 1.0
Amp. An additional connection to the EAC terminals must be made
using a piggyback terminal or similar device.
If the HEAT ENABLE jumper is in the HEAT position and the limit switch
opens (fault code 1), the control will immediately de-energize all electric
heat relay outputs and energize the blower (if it wasn’t already ener-
gized). When the limit switch closes, the control will re-energize electric
heat according to the thermostat inputs using normal timings.
Fan On Lock Condition
If the limit switch opens multiple times during a single call for electric
heat (fault code 3) or if the limit switch opens for a long duration (fault
code 4), the control will energize the blower until power is removed from
the control. The control will cycle the heat outputs on and off as the limit
re-closes and opens. The constant fan operation will signal the home-
owner that a problem has occurred and a service call is required.
LOW FAN
The LOW FAN output can be used to drive an external relay (24 VAC
coil) that switches the power input to the motor to a lower speed tap. An
accessory kit is available for this application.
The LOW FAN output is energized when the control has the following
inputs.
Soft Lockout
TABLE 4: Low Fan Control Inputs
If the limit switch opens for a second long duration period during a sin-
gle call for heat (fault code 5), the control will keep the blower locked on
and lock out the heat outputs for one hour. The control will only reset
this one hour lockout when the power is removed from the control. After
the one hour period has passed, the control will re-energize electric
heat according to the thermostat inputs using normal timings. The
blower will remain locked on from the first long duration limit opening.
Input
G
Operational Mode
Continuous Fan operation
First stage compressor operation
Y1 or Y1 and O
Y/Y2 and HUM de-energized with
HUM STAT jumper in YES position
Dehumidification during cooling
Hard Lockout
Blower Delays
The control has a hard lockout condition during which the control will
keep all heat outputs de-energized until power is removed from the con-
trol. The control de-energizes the blower five minutes after entering the
hard lockout condition.
The control includes the following blower delays:
TABLE 5: Blower Delays
Condition
Blower Delay
60 seconds
30 seconds
10 seconds
If the limit switch closes and re-opens during the one hour soft lockout
period, the control will enter a hard lockout condition and continue to
indicate a fault code 5.
Following call for cooling
Following call for heat pump heating
Following call for electric heat heating
If the limit switch opens twice when no call for electric heat is present
(fault code 2), the control will enter a hard lockout condition.
Heat Output and Limit Connections
If the limit switch opens multiple times soon after a soft lockout reset
(fault code 6), the control will enter a hard lockout condition.
The control is connected to the heater relays and limit switch using the
6-pin connector. The relay outputs and the limit switch signal are 24
VDC.
Wiring Related Faults
If the control receives a simultaneous call for heating and cooling (fault
code 7), the control will perform both heating and cooling operations.
The control energizes the heat relays and senses the limit switch input
as shown in Table 6 when the HEAT ENABLE jumper is in the HEAT
position.
SECTION VII: LINE POWER
CONNECTIONS
TABLE 6: Heat Relays
Power may be brought into the unit through the supply air end of the
unit (top when unit is vertical) or the left side panel. Use the hole appro-
priate to the unit’s orientation in each installation to bring conduit from
the disconnect. The power lead conduit should be terminated at the
electrical control box. To minimize air leakage, seal the wiring entry
point at the outside of the unit. See Figure 3.
Input
W1
Heat Relay Output
HT1
W2
HT1 and HT2
W1 and W2
HT1 and HT2 and HT3
The control energizes the first stage of electric heat immediately, the
second stage 10 seconds after the call for second stage heat, and the
third stage 20 seconds after the call for third stage heat.
Refer to Tables to determine proper wire sizing:
Tables 8 & 9 for cooling only or,
Tables 12 & 13 for single phase or,
Tables 15 & 16 for three phase or,
Table 18 for 460V.
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ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 15 KW)
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
AS SHIPPED FROM FACTORY
SINGLE SOURCE
TYPICAL WIRING WITHOUT ELECTRIC HEAT
GND.
LUG
GND. LUG
GND.
LUG
GND. LUG
(2.5 - 25 KW) - 25 KW SHOWN
POWER
SUPPLY
GND. LUG
GND.
LUG
POWER
SUPPLY
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
& BREAKER BAR REMOVED
TERMINAL
BLOCK
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
SINGLE SOURCE (2.5 - 10 KW)
MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY
GND.
LUG
GND.
LUG
GND. LUG
(JUMPER BAR)
POWER
SUPPLY 1
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
POWER
SUPPLY 2
POWER
SUPPLY
POWER
SUPPLY 3
POWER WIRING (208/230-1-60)
TERMINAL
BLOCK
NOTE: USE ONLY COPPER CONDUCTORS
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
CONNECT LEADS WITH WIRE NUTS
(TYPICAL ALL HEAT KITS)
FIGURE 6: Line Power Connections
3 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
MULTI-SOURCE - 25 KW
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 15 KW)
GND. LUG
GND.
LUG
GND.
LUG
GND. LUG
POWER
SUPPLY 1
POWER
SUPPLY 2
POWER
SUPPLY
TERMINAL
BLOCK
(2) 3-PHASE
BREAKERS
CONNECT TRANSFORMER LEADS WITH WIRE NUTS
(TYPICAL ALL HEAT KITS)
FIGURE 7: 460V - Line Power Connections
SECTION VIII: BLOWER SPEED
CONNECTIONS
FACTORY WIRED TO
TRANSFORMER
All air handlers contain 3-speed blower motors which are prewired to
the control board.
CAP
Adjust blower motor speed to provide airflow within the minimum and
maximum limits approved for evaporator coil, electric heat and outdoor
unit. Speed tap adjustments are made at the motor terminal block, See
Figure 8 or 9. Airflow data is shown in Tables 19 & 20.
FACTORY WIRED TO
FAN MOTOR RELAY
TERMINAL ON
CONTROL BOARD
HIGH
Connect motor wires to motor speed tap receptacle for speed desired.
See wiring label for motor wiring details.
230 VOLT
BLOWER MOTOR
MED
LOW
GND.
FIGURE 8: Blower Speed Connections
ORG
TAPE END & CAP
WITH WIRE NUT
ORG
L1
HIGH
MED
LOW
ORG
HIGH
MED
LOW
460 VOLT
BLOWER
MOTOR
L1
460 VOLT
BLOWER
MOTOR
HIGH
MED
LOW
L2
L1
HIGH
L2
460 VOLT
BLOWER
MOTOR
L2
MEDIUM
LOW
460 VOLT BLOWER MOTOR
FIGURE 9: 460V - Blower Speed Connections
8
Unitary Products Group
262675-UIM-A-0806
SECTION IX: UNIT DATA
TABLE 7: Physical and Electrical Data
Models: MA
08B21
10 x 9
1/4 HP
1075
12B21
10 x 9
3/4 HP
1075
12B41
10 x 9
3/4 HP
1075
460
14D21
10 x 10
1/2 HP
1075
Blower - Diameter x Width
HP
Motor
Nominal RPM
Voltage
Amps
208 / 230
1.5
208 / 230
3.5
208 / 230
2.4
Full Load
Type
2.3
DISPOSABLE OR PERMANENT
Filter1
Size
16 x 20 x 1
1PF0601BK
1FR0617
16 x 20 x 1
1PF0601BK
1FR0617
16 x 20 x 1
1PF0601BK
1FR0617
22 x 20 x 1
1PF0603BK
1FR0624
Permanent Type Kit
Filter Rack
Shipping / Operating Weight (lbs.)
128 / 122
132 / 126
132 / 126
162 / 156
Models: MA
16C21
10 x 10
1 HP
16C41
10 x 10
1 HP
1075
460
20D21
11 x 10
1 HP
20D41
11 x 10
1 HP
1075
460
Blower - Diameter x Width
HP
Motor
Nominal RPM
1075
1075
Voltage
Amps
208 / 230
4.0
208 / 230
7.4
Full Load
Type
2.6
3.7
DISPOSABLE OR PERMANENT
Filter1
Size
20 x 20 x 1
1PF0602BK
1FR0621
20 x 20 x 1
1PF0602BK
1FR0621
22 x 20 x 1
1PF0603BK
1FR0624
22 x 20 x 1
1PF0603BK
1FR0624
Permanent Type Kit
Filter Rack
Shipping / Operating Weight (lbs.)
139 / 133
139 / 133
162 / 156
162 / 156
1. Field Supplied.
TABLE 8: Electrical Data - Cooling Only (60 Hz) - 208/230
Total Motor Amps
Models
60 Hertz
MA
Minimum Circuit Ampacity
60 Hertz
Max. O.C.P.1
Amps/Type
Minimum Wire
Size A.W.G.
208V
230V
208V
1.8
230V
1.9
08BN21
12BN21
14DN21
16CN21
20DN21
1.4
1.5
3.5
2.4
4.0
7.4
15
15
15
15
15
14
14
14
14
14
2.1
2.6
3.0
3.3
4.1
4.4
3.6
4.5
5.0
4.8
6.0
6.5
1. OCP = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
TABLE 9: Electrical Data - Cooling Only (60 Hz) - 460
Max. O.C.P.1
Amps/Type
Total Motor Amps
Minimum Circuit Ampacity
Models
MA
Minimum Wire
Size A.W.G.
60 Hertz
2.3
60 Hertz
3.5
12BN41
16CN41
20DN41
15
15
15
14
14
14
2.6
3.9
3.7
5.6
1. OCP = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
TABLE 10: Conversion Table
KW & MBH Conversions - for Total Power Input Requirement
208V
230V
220V
240V
240V
240V
.751
.918
.840
FOR
OPERATION MULTIPLY
TABULATED KW & MBH BY
Unitary Products Group
9
262675-UIM-A-0806
TABLE 11: Electrical Data - 1 Ø - 208/230-1-60
Total Heat1
MBH
KW Staging
W2 Only
Min.
Speed
Tap
Models
MA
Heat Kit - Single
Phase
Max.
Static
KW
W1 Only
W1 + W2
208V 240V 208V 240V 208V 240V 208V 240V 208V 240V
4HK*6500206
4HK*6500506
4HK*6500806
4HK*6501006
4HK*6500506
4HK*6500806
4HK*6501006
4HK165N1506
4HK*6500506
4HK*6500806
4HK*6501006
4HK16501506
4HK16501806
4HK16502006
4HK*6500506
4HK*6500806
4HK*6501006
4HK16501506
4HK16501806
4HK16502006
4HK*6500806
4HK*6501006
4HK16501506
4HK16501806
4HK16502006
4HK16502506
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Lo
Lo
1.9
3.6
2.5
4.8
6.4
8.5
1.9
3.6
2.8
3.6
3.6
2.8
3.6
3.6
3.6
2.8
3.6
3.6
3.3
3.6
3.6
2.8
3.6
3.6
3.3
3.6
2.8
3.6
3.6
3.3
3.6
3.6
2.5
4.8
3.75
4.8
4.8
3.75
4.8
4.8
4.8
3.75
4.8
4.8
4.4
4.8
4.8
3.75
4.8
4.8
4.4
4.8
3.75
4.8
4.8
4.4
4.8
4.8
1.9
3.6
5.6
7.2
3.6
5.6
7.2
7.2
3.6
5.6
7.2
7.2
6.6
7.2
3.6
5.6
7.2
7.2
6.6
7.2
5.6
7.2
7.2
6.6
7.2
10.8
2.5
4.8
7.5
9.6
4.8
7.5
9.6
9.6
4.8
7.5
9.6
9.6
8.8
9.6
4.8
7.5
9.6
9.6
8.8
9.6
7.5
9.6
9.6
8.8
9.6
14.4
1.9
3.6
2.5
4.8
12.3
19.2
24.6
12.3
19.2
24.6
36.9
12.3
19.2
24.6
36.9
45.1
49.2
12.3
19.2
24.6
36.9
45.1
49.2
19.2
24.6
36.9
45.1
49.2
61.5
16.4
25.6
32.8
16.4
25.6
32.8
49.1
16.4
25.6
32.8
49.1
60.1
65.5
16.4
25.6
32.8
49.1
60.1
65.5
25.6
32.8
49.1
60.1
65.5
81.9
08BN21
12BN21
Med
Hi
5.6
7.5
5.6
7.5
7.2
9.6
7.2
9.6
Lo
3.6
4.8
3.6
4.8
Med
Med
Med
Lo
5.6
7.5
5.6
7.5
7.2
9.6
7.2
9.6
10.8
3.6
14.4
4.8
10.8
3.6
14.4
4.8
Lo
5.6
7.5
5.6
7.5
Med
Med
Hi
7.2
9.6
7.2
9.6
14DN21
16CN21
10.8
13.2
14.4
3.6
14.4
17.6
19.2
4.8
10.8
13.2
14.4
3.6
14.4
17.6
19.2
4.8
Hi
Lo
Lo
5.6
7.5
5.6
7.5
Med
Med
Hi
7.2
9.6
7.2
9.6
10.8
13.2
14.4
5.6
14.4
17.6
19.2
7.5
10.8
13.2
14.4
5.6
14.4
17.6
19.2
7.5
Hi
Lo
Lo
7.2
9.6
7.2
9.6
Med
Med
Med
Med
10.8
13.2
14.4
18.0
14.4
17.6
19.2
24.0
10.8
13.2
14.4
18.0
14.4
17.6
19.2
24.0
20DN21
1. See conversion Table 10.
*
May be 0 (no breaker) or 1 (with breaker).
TABLE 12: Electrical Data - (For Multi-Source Power Supply) - Copper Wire 1 Ø - 208/230-1-60
Max. O.C.P.1 Amps/Type
Circuit
Min. Circuit Ampacity
75°C Wire Size - AWG
Circuit
2nd
Circuit
Models
MA
Heater
Model
1st
3rd
1st
2nd
3rd
1st
2nd
3rd
208/240
208/240
208/240
208/240 208/240 208/240 208/240 208/240 208/240
12BN21
14DN21
4HK165N1506
4HK16501506
4HK16501806
4HK16502006
4HK16501506
4HK16501806
4HK16502006
4HK16501506
4HK16501806
4HK16502006
4HK16502506
47.5 / 54.4
46.0 / 53.0
42.3 / 48.8
46.0 / 53.0
47.8 / 55.0
44.2 / 50.8
47.8 / 55.0
49.3 / 56.5
45.7 / 52.3
49.3 / 56.5
49.3 / 56.5
21.7 / 25.0
21.7 / 25.0
39.7 / 45.8
43.3 / 50.0
21.7 / 25.0
39.7 / 45.8
43.3 / 50.0
21.7 / 25.0
39.7 / 45.8
43.3 / 50.0
43.3 / 50.0
–
50 / 60 25 / 25
50 / 60 25 / 25
45 / 50 40 / 50
50 / 60 45 / 50
50 / 60 25 / 25
50 / 60 40 / 50
50 / 60 45 / 50
50 / 60 25 / 25
50 / 60 40 / 50
50 / 60 45 / 50
–
–
–
–
–
–
–
–
–
–
8 / 6
8 / 6
8 / 8
8 / 6
8 / 6
8 / 6
8 / 6
8 / 6
8 / 6
8 / 6
8 / 6
10 / 10
10 / 10
8 / 8
–
–
–
–
–
–
8 / 8
–
–
10 / 10
8 / 8
–
16CN21
20DN21
–
–
–
8 / 8
–
–
10 / 10
8 / 8
–
–
–
–
–
8 / 8
21.7 / 25.0
50 / 60 45 / 50 25 / 25
8 / 8
10 / 10
1. O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
10
Unitary Products Group
262675-UIM-A-0806
TABLE 13: Electrical Data - (For Single Source Power Supply) - Copper Wire 1 Ø - 208/230-1-60
Field Wiring
Heater
Amps
240V
Models
MA
Heat Kit - Single
Phase*
Max. O.C.P.1 Amps/Type
Min. Circuit Ampacity
75°C Wire Size - AWG
208V
13.03
23.42
35.60
45.08
25.79
37.98
47.46
69.13
24.29
36.48
45.96
67.63
82.07
89.29
26.17
38.35
47.83
69.50
83.94
91.17
42.60
52.08
73.75
88.19
95.42
117.08
240V
14.88
26.88
41.00
51.88
29.38
43.50
54.38
79.38
28.00
42.13
53.00
78.00
94.63
103.00
30.00
44.13
55.00
80.00
96.63
105.00
48.38
59.25
84.25
100.88
109.25
134.25
208V
15
240V
15
208V
14
10
8
240V
14
10
8
4HK*6500206
4HK*6500506
4HK*6500806
4HK*6501006
4HK*6500506
4HK*6500806
4HK*6501006
4HK165N1506
4HK*6500506
4HK*6500806
4HK*6501006
4HK16501506
4HK16501806
4HK16502006
4HK*6500506
4HK*6500806
4HK*6501006
4HK16501506
4HK16501806
4HK16502006
4HK*6500806
4HK*6501006
4HK16501506
4HK16501806
4HK16502006
4HK16502506
10.4
20.0
31.3
40.0
20.0
31.3
40.0
60.0
20.0
31.3
40.0
60.0
73.3
80.0
20.0
31.3
40.0
60.0
73.3
80.0
31.3
40.0
60.0
73.3
80.0
100.0
30
30
08BN21
12BN21
40
45
50
60
8
6
30
30
10
8
10
8
40
45
50
60
8
6
70
90
4
3
30
30
8
10
8
40
45
8
50
60
8
6
14DN21
16CN21
20DN21
70
90
4
3
90
100
110
30
4
3
100
30
3
2
8
8
40
45
8
8
50
60
8
6
70
90
4
3
90
100
110
50
4
3
100
45
3
2
8
8
60
60
8
6
90
90
3
3
90
110
125
150
3
2
100
125
3
2
1
1/0
1. O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
May be 0 (no breaker) or 1 (with breaker).
*
TABLE 14: Electrical Data - 3 Ø - 208/230-3-60
Total Heat1
MBH
KW Staging
W2 Only
Min.
Speed
Tap
Models
MA
Heat Kit -
Three Phase
Max.
Static
KW
W1 Only
W1 + W2
208V 240V 208V 240V 208V 240V 208V 240V 208V 240V
08B
12B
4HK06501025
4HK06501025
4HK06501025
4HK06501525
4HK06501825
4HK06501025
4HK06501525
4HK06501825
4HK06501025
4HK06501525
4HK16502525
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Hi
7.2
7.2
9.6
9.6
24.6
24.6
24.6
36.9
44.7
24.6
36.9
44.7
24.6
36.9
61.4
32.8
32.8
32.8
49.1
58.7
32.8
49.1
58.7
32.8
49.1
81.4
7.2
7.2
9.6
9.6
7.2
7.2
9.6
9.6
7.2
7.2
9.6
9.6
Med
Med
Med
Hi
7.2
9.6
7.2
9.6
7.2
9.6
7.2
9.6
14D
16C
10.8
12.9
7.2
14.4
17.2
9.6
10.8
12.9
7.2
14.4
17.2
9.6
10.8
12.9
7.2
14.4
17.2
9.6
10.8
12.9
7.2
14.4
17.2
9.6
Med
Med
Hi
10.8
12.9
7.2
14.4
17.2
9.6
10.8
12.9
7.2
14.4
17.2
9.6
10.8
12.9
7.2
14.4
17.2
9.6
10.8
12.9
7.2
14.4
17.2
9.6
Lo
20D
Med
Med
10.8
18.0
14.4
24.0
10.8
9.0
14.4
12.0
10.8
18.0
14.4
24.0
10.8
18.0
14.4
24.0
1. See conversion Table 10.
Unitary Products Group
11
262675-UIM-A-0806
TABLE 15: Electrical Data - (For Multi-Source Power Supply) - Copper Wire 3 Ø - 208/230-3-60
Max. O.C.P.1 Amps/Type
Min. Circuit Ampacity
75°C Wire Size - AWG
Circuit
2nd
Circuit
2nd
Circuit
Models
MA
Heater
Model
1st
3rd
208/240
- / -
1st
3rd
1st
2nd
3rd
208/240
40.0 / 45.4
208/240
31.3 / 36.1
208/240 208/240 208/240 208/240 208/240 208/240
20D
4HK16502525
40 / 50
35 / 40
- / -
8 / 8
8 / 8
- / -
1. O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
TABLE 16: Electrical Data - (For Single Source Power Supply) - Copper Wire 3 Ø - 208/230-3-60
Field Wiring
Heater
Amps
240V
Models
MA
Heat Kit -
Three Phase
Max. O.C.P.1 Amps/Type
Min. Circuit Ampacity
75°C Wire Size - AWG
208V
26.8
27.6
29.1
41.6
48.9
29.5
42.0
49.3
33.8
43.5
240V
30.8
31.9
33.3
46.4
56.1
33.9
48.4
56.8
38.1
52.6
208V
30
30
30
45
50
30
45
50
35
45
240V
35
35
35
50
60
35
50
60
40
60
208V
10
10
10
8
240V
08B
12B
4HK06501025
4HK06501025
4HK06501025
4HK06501525
4HK06501825
4HK06501025
4HK06501525
4HK06501825
4HK06501025
4HK06501525
23.1
23.1
23.1
34.7
41.4
23.1
34.7
41.4
23.1
34.7
8
8
8
8
6
8
8
6
8
6
14D
8
10
8
16C
20D
6
8
8
1. O.C.P. = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
2. Heaters are 3 Phase.
TABLE 17: Electrical Data - 460-3-60
Total Heat1
KW Staging
MAX. STATIC & MIN. CFM
MA
Heater
KW
MBH
480V
3.28
3.28
4.92
3.28
4.92
9.84
W1 Only W2 Only W1 + W2
Models
Models
Static
0.5”
0.5”
0.5”
0.5”
0.5”
0.5”
Taps
Med
Med
Med
Med
Med
Med
480V
9.6
480V
9.6
480V
9.6
480V
9.6
12BN41
16CN41
4HK06501046
4HK06501046
4HK06501546
4HK06501046
4HK06501546
4HK06502946
9.6
9.6
9.6
9.6
14.4
9.6
14.4
9.6
14.4
9.6
14.4
9.6
20DN41
14.4
28.8
14.4
14.4
14.4
28.8
14.4
28.8
TABLE 18: Electrical Data - (For Single Source Power Supply) - Copper Wire 3 Ø - 460-3-60
Field Wiring
MA
Models
Heater
Models
Wire Size - AWG
75°C
Min. Circuit Ampacity
Max. O.C.P.1 Amps/Type
480V
17.4
17.8
24.9
19.1
26.3
48.0
480V
20
480V
12
10
10
10
8
12BN41
16CN41
4HK06501046
4HK06501046
4HK06501546
4HK06501046
4HK06501546
4HK06502946
25
25
25
20DN41
30
50
8
1. OCP = Over Current Protection device, must be HACR type Circuit Breaker or Time Delay fuse.
12
Unitary Products Group
262675-UIM-A-0806
TABLE 19: Air Flow Data - 60 Hz Models (230 & 460 Volt)
230 / 460 Volt - 60 Hz
Models
MA
Models
MC
BlowerMotor
Speed
CFM1 @ External Static Pressure - IWC
0.1
0.2
0.3
0.4
0.5
0.6
0.7
405
0.8
289
0.9
173
84
1
High
Med.
Low
1102
831
986
870
754
638
521
57
MC18B**H
MC24B**H
MC30B**H
MC36B**H
MC42C**H
MC48C**H
MC48D**H
MC60D**H
MC61D**H
MC48D**H
MC60D**H
MC61D**H
737
644
551
457
364
271
178
N/A
N/A
114
25
615
537
458
379
300
221
142
63
N/A
225
116
08B
12B
16C
High
Med.
Low
1112
851
1001
759
890
780
669
558
447
336
667
576
484
392
300
208
643
562
480
399
317
236
154
73
N/A
264
170
144
38
N/A
108
36
High
Med.
Low
1511
1241
1100
1464
1195
1073
1959
1631
1447
2018
1684
1561
1715
1471
1379
1763
1487
1381
1746
1486
1392
2226
2115
N/A
1355
1107
980
1199
973
1043
839
887
731
576
420
705
572
438
304
861
741
622
502
383
263
24
High
Med.
Low
1286
1050
944
1108
905
929
751
573
394
216
N/A
N/A
N/A
810
533
712
910
884
801
508
503
392
N/A
N/A
N/A
581
450
445
1328
1254
1151
1368
1295
1200
1472
1369
1245
761
616
471
326
181
37
815
687
558
429
300
172
43
High
Med.
Low
1874
1587
1431
1895
1595
1476
1671
1438
1330
1713
1462
1353
1699
1442
1336
2190
2087
N/A
1802
1542
1401
1772
1506
1392
1608
1367
1276
1649
1412
1292
1655
1393
1285
2103
2017
N/A
1708
1473
1363
1649
1417
1308
1547
1318
1227
1581
1356
1225
1579
1333
1226
2035
1951
1716
2107
2008
1718
2191
2069
1779
1606
1395
1304
1525
1328
1223
1460
1263
1157
1511
1280
1186
1486
1270
1158
1931
1851
1643
2027
1944
1676
2139
1986
1723
1486
1315
1241
1402
1240
1139
1338
1180
1047
1407
1210
1057
1399
1189
1061
1845
1744
1554
1906
1852
1600
1951
1862
1646
1408
1218
1098
1279
1151
1055
1232
920
1264
967
953
821
751
1033
973
896
727
587
567
852
726
669
796
628
680
1465
1406
1292
1469
1416
1311
1556
1498
1381
844
High
Med.
Low
1156
1062
970
High
Med.
Low
1003
824
866
681
High
Med.
Low
1276
1087
863
995
14D
795
780
High
Med.
Low
1264
1081
882
1093
776
740
High
Med.
Low
1683
1542
1451
1786
1692
1447
1859
1727
1514
1541
1466
1379
1538
1499
1389
1656
1566
1442
High
Med.
Low
2326
2150
1737
2357
2212
1765
2235
2089
1752
2321
2144
1783
2192
2036
1745
2254
2111
1803
20D
High
Med.
Low
1. Includes return air filter, coil, and 10kW electric heater.
All MA series air handler units are UL Listed up to 0.50" w.c. external static pressure, including air filter, wet coil, and largest KW size heater.
Unitary Products Group
13
262675-UIM-A-0806
TABLE 20: Air Flow Data - 60 Hz Models (208 Volt)
208 Volt - 60 Hz
Models
MA
Models
MC
Blower Motor
Speed
CFM1 @ External Static Pressure - IWC
0.1
0.2
0.3
0.4
0.5
615
0.6
499
0.7
383
0.8
267
126
N/A
288
156
24
0.9
150
42
1
High
Med.
Low
1080
712
964
848
732
34
MC18B**H
MC24B**H
MC30B**H
MC36B**H
MC42C**H
MC48C**H
MC48D**H
MC60D**H
MC61D**H
MC48D**H
MC60D**H
MC61D**H
628
544
461
377
293
210
N/A
N/A
73
529
452
376
299
223
146
70
N/A
180
72
08B
12B
16C
High
Med.
Low
1039
743
932
825
717
610
502
395
659
575
491
407
323
239
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
557
493
424
921
782
742
548
392
358
572
469
347
549
398
462
1342
1245
1081
1370
1213
1128
1298
1182
1088
532
460
387
315
242
169
97
N/A
65
High
Med.
Low
1444
1101
937
1271
967
1099
833
927
755
582
410
238
163
147
262
187
129
985
791
725
1157
948
868
936
684
625
850
687
638
813
744
554
1553
1440
1285
1574
1472
1308
1496
1420
1258
699
565
431
297
29
824
711
598
485
372
260
34
High
Med.
Low
1434
1083
933
1267
955
1099
827
932
764
597
430
95
699
571
443
315
59
818
703
588
473
359
244
14
High
Med.
Low
1782
1468
1310
1983
1529
1312
1549
1275
1190
1545
1266
1192
1564
1303
1204
2250
1953
N/A
1712
1415
1278
1865
1446
1249
1498
1269
1162
1490
1248
1186
1520
1262
1161
2180
1956
N/A
1619
1355
1239
1747
1363
1185
1448
1225
1112
1463
1207
1126
1455
1225
1104
2139
1905
1544
2144
1926
1521
2092
1913
N/A
1524
1298
1185
1629
1280
1122
1383
1181
1074
1378
1140
1067
1400
1165
1060
2062
1858
1538
2073
1887
1523
2054
1862
1546
1435
1233
1125
1511
1197
1059
1325
1115
975
1323
1144
1045
1393
1114
995
1213
1005
934
798
669
561
1039
865
805
658
548
493
739
564
507
755
590
532
1461
1355
1195
1478
1387
1213
1435
1315
1184
High
Med.
Low
1275
1031
932
High
Med.
Low
1235
997
1125
811
817
737
High
Med.
Low
1337
1101
992
1231
1005
842
1115
839
14D
740
High
Med.
Low
1336
1117
1001
1971
1755
1455
2003
1836
1507
1910
1766
1491
1257
1028
870
1154
827
745
High
Med.
Low
1855
1649
1401
1921
1761
1436
1762
1661
1407
1683
1528
1346
1809
1643
1379
1595
1513
1354
High
Med.
Low
2251
1987
1492
2208
1959
N/A
2186
1945
1517
2123
1945
N/A
20D
High
Med.
Low
1. Includes return air filter, coil, and 10kW electric heater.
All MA series air handler units are UL Listed up to 0.50" w.c. external static pressure, including air filter, wet coil, and largest KW size heater.
14
Unitary Products Group
262675-UIM-A-0806
MA SERIES - Air Handler Control Wiring
Typical A/C - Cooling only Applications
MA SERIES - Air Handler Control Wiring
Typical A/C with Electric Heat Applications
AIR HANDLER
BOARD
AIR HANDLER
BOARD
THERMOSTAT
THERMOSTAT
1 - STAGE
AIR CONDITIONING
1 - STAGE
AIR CONDITIONING
R
G
R
R
G
Y
R
G
G
Y
Y / Y2
Y
Y / Y2
Y
W1
W2
C
Y1
Y1
W2
W2
W2
*
*
W1
O
W1
O
HUMIDISTAT
HUMIDISTAT
W1
C
HUM
X / L
COM
HUM
X / L
COM
C
C
FIGURE 10: Cooling Models with Electric Heat Wiring
1. “Y” Terminal on Air Handler Control Board must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.
2. Optional humidity switch - contacts open on humidity rise.
3. Remove HUM STAT Jumper on AH Control Board
4. MODE Jumper on AH control board should be set to A/C for air conditioners and HP for heat pumps.
5. To change quantity of heat during HP defrost cycle - Reverse connections at W1 & W2 on Air Handler Control Board
CONTROL WIRING - MA Series - Air Handler & New UPG HP Systems
Two Stage H/P with York Guard VI Board & Copeland “Ultra Tech”
Conventional Application - Not Hot Heat Pump
2 - STAGE SCROLL
HEAT PUMP
AIR HANDLER
BOARD
THERMOSTAT
R
G
R
G
R
Y2
Y2
Y / Y2
Y1
Y2 OUT
Y1
Y1
W2 OUT
W2
W1
E
W1 OUT
W
O
W
O
O
*
HUMIDISTAT
HUM
X / L
BS
X / L
C
X / L
C
COM
FIGURE 11: Two-Stage Cooling Wiring
1. “Y” Terminal on Air Handler Control Board must be connected for full CFM and applications requiring 60 second blower off delay for SEER enhancement.
2. Optional humidity switch - contacts open on humidity rise.
3. Remove HUM STAT Jumper on AH Control Board
4. MODE Jumper on AH control board should be set to A/C for air conditioners and HP for heat pumps.
5. To change quantity of heat during HP defrost cycle - Reverse connections at W1 & W2 on Air Handler Control Board
LUBRICATION
The bearings of the blower motor are permanently lubricated.
SECTION X: MAINTENANCE
Filters must be cleaned or replaced when they become dirty. Inspect at
least once per month. The frequency of cleaning depends upon the
hours of operation and the local atmospheric conditions. Clean filters
keep unit efficiency high.
Unitary Products Group
15
NOTES
Subject to change without notice. Printed in U.S.A.
262675-UIM-A-0806
Copyright © by York International Corp. 2006. All rights reserved.
Supersedes: 170341-UIM-C-0806
Unitary
Product
Group
5005
York
Drive
Norman
OK
73069
|