Carrier 40QNC User Manual

40QNC / 38HDF  
40QNQ / 38QRF  
High---Wall Duct Free Split System  
Sizes 018 to 036  
Installation Instructions  
SAFETY CONSIDERATIONS  
Improper installation, adjustment, alteration, service, maintenance,  
or use can cause explosion, fire, electrical shock, or other  
conditions which may cause death, personal injury, or property  
damage. Consult a qualified installer, service agency, or your  
distributor or branch for information or assistance. The qualified  
installer or agency must use factory--authorized kits or accessories  
when modifying this product. Refer to the individual instructions  
packaged with the kits or accessories when installing.  
Follow all safety codes. Wear safety glasses, protective clothing,  
and work gloves. Use quenching cloth for brazing operations.  
Have fire extinguisher available. Read these instructions  
thoroughly and follow all warnings or cautions included in  
literature and attached to the unit. Consult local building codes and  
current editions of the National Electrical Code ( NEC ) NFPA 70.  
In Canada, refer to current editions of the Canadian electrical code  
CSA 22.1.  
!
Recognize safety information. This is the safety--alert symbol  
When you see this symbol on the unit and in instructions or  
manuals, be alert to the potential for personal injury. Understand  
these signal words; DANGER, WARNING, and CAUTION. These  
words are used with the safety--alert symbol. DANGER identifies  
the most serious hazards which will result in severe personal injury  
or death. WARNING signifies hazards which could result in  
personal injury or death. CAUTION is used to identify unsafe  
practices which would result in minor personal injury or product  
and property damage. NOTE is used to highlight suggestions  
which will result in enhanced installation, reliability, or operation.  
40QNC, QNQ Unit  
NOTE: Read the entire instruction manual before starting the  
installation.  
!
WARNING  
UNIT OPERATION AND SAFETY HAZARD  
!
Failure to follow this warning could result in personal injury or  
equipment damage.  
WARNING  
ELECTRICAL SHOCK HAZARD  
Puron refrigerant systems operate at higher pressures than  
standard R--22 systems. To avoid damage to the unit or  
possible personal injury, do not use R--22 service equipment or  
components on Puron refrigerant equipment.  
Failure to follow this warning could result in personal  
injury or death.  
Before installing, modifying, or servicing system, main  
electrical disconnect switch must be in the OFF  
position. There may be more than 1 disconnect switch.  
Lock out and tag switch with a suitable warning label.  
!
CAUTION  
PERSONAL INJURY AND EQUIPMENT DAMAGE  
HAZARD  
Failure to follow this caution may result in personal injury  
and / or equipment damage.  
DO NOT operate the unit without a filter or with grille  
removed.  
CLEARANCES -- INDOOR  
4 in.  
min.  
8 in.  
min.  
4 in.  
min.  
80 in.  
min.  
A08357  
Fig. 3 -- 40QNC,QNQ Unit Clearances  
CLEARANCES -- OUTDOOR  
A
Air-outlet  
E
D
B
C
Air-inlet  
A08436  
UNIT  
Coil Facing Wall --- in. (mm)  
Fan Facing Wall --- in. (mm)  
A
B
C
D
E
24 (610)  
36 (914)  
36 (914)  
6 (152)  
24 (610)  
36 (914)  
8 (203)  
8 (203)  
36 (914)  
6 (152)  
Fig. 4 -- Outdoor Unit Clearance  
3
These installation instructions cover the installation of the matched  
systems listed in table 2.  
SYSTEM REQUIREMENTS  
Clearances  
Allow sufficient space around the indoor and outdoor unit for  
proper airflow circulation and servicing. Refer to Fig. 3 and Fig. 4  
for minimum required clearances.  
Parts List  
Indoor Unit  
The following items are included with the indoor unit:  
Piping: Piping and insulation is field supplied.  
Table 1 – Installation Materials  
Piping Lengths  
The minimum length between the indoor and outdoor units is 10 ft  
(3 m). Refer to table 3 for the maximum lengths allowed.  
Description  
Wall Mounting  
Bracket  
Qty  
Usage  
1
For Indoor Unit Installation  
For Attaching The Remote Control  
Holder To The Wall  
For Attaching The Mounting Bracket To  
The Wall  
Screws, 4XL10  
2
Table 3 – Maximum Refrigerant Line Lengths  
Screws, 5XL25  
Remote Control  
Remote Control  
Holder  
5/14*  
Unit  
Size  
Max Line  
Length ft(m)  
Max Elevation (ID  
over OD) ft(m)  
Max Elevation (OD  
over OD) ft(m)  
1
1
For Controlling Unit  
18K  
24K  
30K  
36K  
200 (61)  
200 (61)  
200 (61)  
200 (61)  
65 (19.8)  
65 (19.8)  
65 (19.8)  
65 (19.8)  
200 (61)  
200 (61)  
200 (61)  
200 (61)  
Holder For Remote Control  
* 5 screws for unit sizes 18 and 24. 14 screws for unit sizes 30 and 36.  
Note:For lengths greater than 25 ft (7.6 m), refer to the Duct Free Long  
Line Guide.  
Outdoor Unit  
The following items are included with the outdoor unit:  
Pipe Sizes  
Refer to table 4 for pipe sizes.  
Table 4 – Pipe Sizes  
Pipe Sizes (in)  
Unit Size  
18K  
24K  
30K  
36K  
M i x P h a s e --- i n  
Vapor --- in  
3/8  
3/8  
3/8  
3/8  
5/8  
5/8  
3/4  
3/4  
38HDF018-036  
Note:Both lines need to be insulated using at least 1/2 inch closed foam  
A09499  
insulation.  
Fig. 5 -- 38HDF018--036  
Condensate Drain Pipe Sizes  
Refer to table 5 for the required sizes.  
Table 5 – Drain Pipe Sizes  
Unit Size  
18K  
24K  
30K  
36K  
Outside Diameter --- in  
Inside Diameter --- in  
5/8  
5/8  
3/4  
3/4  
7/16  
7/16  
5/9  
5/9  
Note:Do not trap condensate pipe.  
A09500  
Fig. 6 -- 38QRF018--036  
Piston  
Flare  
Model  
Filter Drier  
Pistons*  
Cap  
n
Connector  
n
38HDF  
38QRF  
n
n
n
n
n
(qty 2)  
n (qty 3)  
* Multiple pistons. Quantity varies with size.  
Table 2 – Matched Systems  
System  
Type  
Nominal  
Capacity  
018  
024  
030  
036  
018  
024  
030  
Outdoor  
Unit  
Indoor  
Unit  
38HD F018 --- --- --- 3  
38HD F024 --- --- --- 3  
38HD F030 --- --- --- 3  
38HDF036--- --- ---3/5/6  
38QRF018 --- --- --- 3  
38QRF024 --- --- --- 3  
38QRF030 --- --- --- 3  
38QRF036--- --- ---3/5/6  
40QNC018024--- --- ---3  
40QNC018024--- --- ---3  
40QNC 030 --- --- --- 3  
40QNC 036 --- --- --- 3  
40QNQ018 --- --- --- 3  
40QNQ024 --- --- --- 3  
40QNQ030 --- --- --- 3  
40QNQ036 --- --- --- 3  
Cooling  
Only  
Heat  
Pump  
036  
4
Refrigerant Charge  
Control Wiring  
The 38HDF and 38QRF units can be matched with multiple  
outdoor units and thus additional charge might be required when  
matched with the 40QNC or 40QNQ units.  
Thermostat wires should be used for control wiring between the  
indoor and outdoor units. A two conductor cable is required for  
the cooling only units and a seven conductor cable is required on  
heat pumps. 18 AWG is recommended for any length up to 50 ft  
(15.2 m). 16 AWG is recommended for lengths between 50 and  
200 ft (15.2 and 61.0 m).  
Table 6 – Additional Charge  
Additional Charge lb (kg)  
Unit Size  
018  
024  
030  
036  
38HDF  
1.2 (0.55)  
1.0 (0.45)  
2.4 (1.1)  
0
38QRF  
0.8 (0.36)  
0.5 (0.23)  
User Interface  
The indoor unit is supplied with a wireless remote control. The  
following accessories are also available  
0
0
S Wall mounted control. Up to 6 units can be daisy chained and  
Note:The above additional charge is required amount for line lengths up to  
25 ft (7.6 m). For line lengths exceeding 25 ft (7.6 m), additional charge will  
be required. Refer to the Duct Free Splits Long Line Guide.  
controlled by one wired control.  
S Zone manager capable of controlling up to 32 units divided up  
to 8 different zones.  
Metering Device  
Operating Range  
Ensure that the system operates within the application guidelines  
shown in Table 10.  
The metering device(s) for these systems is a type B Accurator  
installed with the outdoor unit. One Accurator is required for the  
cooling only system and two are required for the heat pump  
systems. The Accurators are supplied with the outdoor unit.  
However, since the same outdoor unit can be matched with  
multiple indoor units, the correct Accurator must be selected. Refer  
to Table 7 for the correct Accurator size.  
Cooling Operating Range  
Maximum  
DB ° F (° C)  
Minimum  
WB ° F (° C)  
DB ° F (° C)  
WB ° F (° C)  
Outdoor  
Unit  
125 (51.7)  
--- ---  
55 (12.8)  
--- ---  
Table 7 – Accurator Sizes  
Indoor  
Unit  
90 (32.2)  
74 (23.3)  
62 (17.0)  
56 (13)  
Cooling  
Accurator  
Heating  
Accurator  
System Type  
Size  
018  
024  
030  
036  
018  
024  
030  
036  
49  
55  
63  
70  
49  
55  
63  
70  
---  
---  
---  
Heating Operating Range  
Maximum  
Minimum  
Cooling Only  
DB ° F (° C)  
WB ° F (° C)  
DB ° F (° C)  
WB ° F (° C)  
---  
Outdoor  
75 (23.9)  
Unit  
Indoor  
81 (27.2)  
Unit  
67 (19.4)  
17 (---8.3)  
--- ---  
45  
49  
53  
63  
Heat Pumps  
--- ---  
62 (17.0)  
--- ---  
Accessories  
Power and Connecting Cables -- Field Supplied  
An extensive list of field installed accessories is available for both  
indoor and outdoor units. Identify what accessories, if any, are  
required for the application at hand and consult the separate  
Power:  
S The indoor and outdoor units require a dedicated power supply.  
S Consult local building codes, NEC (National Electric Code) or  
CEC (Canadian Electric Code) for any special requirements.  
S Use Table 8 for the electrical requirements for the outdoor units  
and Table 9 for the indoor units to correctly size the cables and  
disconnect switches.  
installation instructions for the accessories.  
Some of the  
accessories, especially on the indoor units, can be installed much  
easier if planned ahead.  
Table 8 – 38HDF / QRF Electrical Requirements  
38HDF  
38QRF  
Unit  
Size  
Min Ckt Amps/  
Fuse HACR Bkr  
Amps  
Min Ckt Amps/  
Fuse HACR Bkr  
Amps  
Voltage  
018  
024  
030  
036  
036  
036  
208/230---1---60  
208/230---1---60  
208/230---1---60  
208/230---1---60  
208/230---3---60  
460 --- 3 --- 60  
12.1/20  
16.8/25  
18.4/30  
23.8/40  
18.0/30  
8.3/15  
12.1/20  
16.8/25  
18.4/30  
23.8/40  
18.0/30  
8.3/15  
Table 9 – 40QNC / QNQ Electrical Requirements  
40QNC  
40QNQ  
Unit  
Size  
Min Ckt Amps/  
Fuse HACR Bkr  
Amps  
Min Ckt Amps/  
Fuse HACR Bkr  
Amps  
Voltage  
018  
024  
030  
036  
208/230---1---60  
208/230---1---60  
208/230---1---60  
208/230---1---60  
0.48/15  
0.48/15  
0.48/15  
0.55/15  
0.48/15  
0.48/15  
0.48/15  
0.55/15  
5
a. Carefully remove the mounting plate which is attached  
to the back of the unit by removing any screws and  
pushing at the indicated pressure points at the bottom of  
the unit.  
INSTALLATION  
Complete Pre--installation Checks  
1. Unpack Unit -- Store the indoor and outdoor units in the  
original packaging until it is moved to the final site for in-  
stallation.  
2. Inspect Shipment -- Upon receipt of shipment, check the  
indoor and outdoor units for damage. If there is any dam-  
age, forward claim papers directly to the transportation  
company. Manufacturer is not responsible for damage in-  
curred in transit.  
3. Inspect Parts Supplied With Units – Check all items  
against parts list (see Table 1). If any items are missing, noti-  
fy your distributor or Carrier office. To prevent loss or  
damage, leave all parts in original packages until installa-  
tion.  
Remove Screw  
A09048  
Consider System Requirements  
Fig. 9 -- Mounting Plate Screw Location  
1. Consult local building codes and NEC for special installa-  
tion requirements.  
2. When deciding the location of the indoor and outdoor units,  
ensure that the piping run does not exceed the allowed dis-  
tances listed in Table 3.  
b. The mounting plate should be located horizontally and  
level on the wall. All minimum spacing shown below  
should be maintained.  
5” (127) min.  
3. Make sure the indoor and outdoor units are easily accessible  
to electrical power.  
4. Allow sufficient clearances for airflow, wiring, refrigerant  
piping, and servicing the unit. See Fig. 3 and Fig. 4.  
5. Condensate piping can be directed through the inside wall  
to an approved drain or straight outside.  
18”  
(457.2)  
min.  
12”  
(304.8)  
min.  
INSTALL INDOOR UNIT  
Plan the installation carefully before you begin.  
Note: Numbers in ( ) = mm  
1. Select indoor unit location.  
Plumb line  
a. A location that can bear the weight of the unit.  
A09049  
b. Do not install indoor units near a direct source of heat  
such as direct sunlight or a heating appliance.  
Fig. 10 -- Minimum Spacing  
c. Do not install units too close to humid conditions.  
c. Install the wall mounting bracket in a location that is  
strong enough to withstand the weight of the unit.  
2. Install Mounting Plate  
The factory supplied mounting plate will look like one of  
the following depending on the size of the unit.  
d. If the wall is block, brick, concrete or similar material,  
drill 0.2 in (5 mm) diameter holes and insert anchors for  
the appropriate mounting screws.  
3.5"  
35.4” (899.2)  
14.9" (378.5)  
(88.9)  
e. Fasten the wall hanging bracket to the wall with 4 or  
more screw anchors through the holes near the outer  
edge of the bracket.  
2.1"  
(53.3)  
7.7" (195.6)  
2.8"  
2.8"  
(71.1)  
(71.1)  
f. Install the wall hanging bracket flush to the wall, and  
ensure the bracket does not move.  
1"  
(25.4)  
2.1"  
3. Drill hole in wall for interconnecting piping, drain, and wir-  
ing  
(53.3)  
B
A
2"  
(50.8)  
13.8" (130.5)  
5.1”  
(129.5)  
Note: Numbers in ( ) = mm  
Refrigerant Line Routing  
A09046  
Piping for indoor units can be routed as shown in Fig. 11.  
Fig. 7 -- 40QNC, QNQ018,024 Mounting Plate  
27.2”  
(690.9)  
27.1”  
(688.3)  
8.4” (213)  
Measurements in ( ) = mm  
A09047  
A08358A  
Fig. 8 -- 40QNC, QNQ030, 036 Mounting Plate  
Fig. 11 -- Refrigerant Line Routing  
Before mounting the 40QNC, QNQ unit on the wall mounting  
bracket, consider how the refrigerant piping will be routed.  
Rear Piping  
Determine the pipe hole position using the mounting plate as a  
template. Drill a 2--1/2 inch (63.5 mm) diameter hole in the wall at  
Complete the following when installing the wall mounting bracket:  
6
point A or B as shown in Fig. 12 or Fig. 13. Drill the hole at a  
slope so that the outside end is 1/2 inch (13 mm) lower than inside  
end to ensure optimal drainage. Refer to Fig. 14.  
INSTALL OUTDOOR UNIT  
The outdoor units can be installed on the ground, on the roof, or  
mounted on a wall.  
NOTE: Install the unit so that the coil does not face into  
prevailing winds. If this is not possible and constant wind winds  
above 25 mph are expected, use accessory wind baffle. See  
installation instructions provided with accessory kit. Wind baffles  
should also be used on all units with accessory low ambient  
temperature control.  
Side Or Bottom Piping  
Remove the knockout in the unit and drill a 2--1/2 inch (63.5 mm)  
hole where the pipe penetrates the structure using the guides given  
above.  
3.5"  
35.4” (899.2)  
14.9" (378.5)  
(88.9)  
2.1"  
(53.3)  
7.7" (195.6)  
2.8"  
2.8"  
(71.1)  
(71.1)  
Mounting on Ground  
1. Mount unit on a solid level concrete pad.  
2. If a heat pump is being installed, use a field-- provided snow  
stand or ice rack where prolonged subfreezing temperatures  
or heavy snow occurs.  
1"  
(25.4)  
2.1"  
(53.3)  
3. Position unit so water or ice from roof does not fall directly  
onto unit.  
B
A
2"  
(50.8)  
13.8" (130.5)  
5.1”  
(129.5)  
Note: Numbers in ( ) = mm  
A09046  
4. On cooling only units, an accessory stacking kit can be used  
when units are to be stacked. See installation instructions  
provided with the accessory kit.  
Fig. 12 -- 40QNC, QNQ018, 024 Mounting Plate  
Mounting on Roof  
!
CAUTION  
PERSONAL  
INJURY  
AND/OR  
EQUIPMENT  
A
B
2"  
5.1"  
DAMAGE HAZARD  
Failure to follow this caution may result in personal injury  
and / or equipment damage.  
Be sure unit panels are securely in place prior to rigging.  
A09050  
Fig. 13 -- 40QNC, QNQ030, 036 Mounting Plate  
1. Rig the unit. Keep the unit upright and lift using a sling.  
Use cardboard or padding under the sling, and spreader bars  
to prevent sling damage to the unit. See Fig 16. See Fig. 2  
for center of gravity reference  
1/2 in. (13 mm)  
Min.  
2. Mount unit on a solid concrete pad or platform.  
3. Isolate unit and piping from structure  
INDOOR  
OUTDOOR  
4. If a heat pump is being installed, use a field-- provided snow  
stand or ice rack where prolonged subfreezing temperatures  
or heavy snow occurs.  
A07371  
Fig. 14 -- Drill Hole at Slope  
4. Relocate drain connection if necessary -- Determine if the  
installation requires a left or a right hand drain exit and relo-  
cate the drain hose if necessary as shown in Fig. 15.  
5. On cooling only units, an accessory stacking kit can be used  
when units are to be stacked. See installation instructions  
provided with accessory kit.  
Drain Cap  
Drain Hose  
A08362  
Fig. 15 -- Drain Hose and Cap Location  
NOTE: If the condensate pump accessory is to be used, the drain  
hose can be cut to provide space for the space for the condensate  
pump reservoir in the back of the unit. The reservoir must be  
installed at this time. Please refer to installation instructions  
provided with the condensate pump accessory.  
A07396  
Fig. 16 -- Lifting Unit with Sling  
5. Place unit on a clean surface until you are ready to connect  
the piping and wiring.  
7
38HDF Units:  
1. Assemble the connector tube to the factory supplied filter  
Mounting Unit on Wall  
The units can also be mounted on the wall using the accessory  
mounting kit.  
drier by:  
a. Braze the field supplied connector to the inlet of the  
filter drier (see Fig. 17)  
Complete Outdoor Refrigerant Piping Connec-  
tions  
b. Braze the factory supplied flare connector to the outlet  
end of the filter drier (see Fig.17)  
Follow the following general guidelines:  
1. Use refrigerant grade field – supplied tubing.  
Refer to Table 4 for the correct line sizes.  
2. Do not use less than 10 ft (93.05 m) of interconnecting  
tubing.  
!
CAUTION  
UNIT DAMAGE HAZARD  
A09499  
Failure to follow this caution may result in equipment  
damage or improper operation.  
Fig. 17 -- 38HDF018--036 Connector Tube Assembly  
If any section of pipe is buried, there must be a 6 in. (152.4  
mm) vertical rise to the valve connections on the outdoor  
unit. If more than the recommended length is buried,  
refrigerant may migrate to cooler, buried section during  
extended periods of system shutdown. This causes  
refrigerant slugging and could possibly damage the  
compressor at start--up.  
2. Assemble the Accurator body (see Fig. 18) using the correct  
factory supplied piston (refer to Table 7) .  
When more than 80 ft (24.4 m) of interconnecting tubing is used,  
consult the Duct--Free Split System Long Line Application Guide  
for required accessories.  
NOTE: Arrow on AccuRater body points in free flow direction, away from the  
indoor coil.  
A09501  
Fig. 18 -- AccuRater (bypass type) Metering Device  
Components  
3. Insulate both lines. A minimum of 1/2 inch foam pipe insu-  
lation is recommended.  
4. Run the refrigerant tubes as directly as possible and avoid  
unnecessary turns and bends.  
3. Attach the complete Accurator assembly to the flare connec-  
tion end of the filter drier  
5. Suspend refrigerant tubes to avoid damage to insulation or  
tubes so they do not transmit vibration to the structure.  
4. Braze the completed filter drier/Accurator assembly to the  
liquid service valve.  
6. When passing refrigerant tubes through the wall, seal the  
opening so rain and insects do not enter the structure. Leave  
some slack in refrigerant tubes between structure and out-  
door unit to absorb vibration.  
5. Connect the field supplied line set to the filter drier/Accura-  
tor assembly and the suction valve. A sweat connection is  
required at the suction valve and flare connection is required  
for the mixed phase line.  
6. Insulate any exposed areas between the line set and the li-  
quid valve.  
NOTE: A fusible plug is located in unit suction line; do not cap  
this plug. If local codes require additional safety devices, install as  
directed.  
Connection at Outdoor Unit  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment damage  
or improper operation.  
To prevent damage to unit or service valves observe the  
following:  
S A brazing shield MUST be used.  
S Wrap service valves with wet cloth or use a heat sink  
material.  
8
38QRF Units  
1. Assemble the connector tubes to the factory supplied filter  
!
CAUTION  
drier by brazing the factory supplied flare connectors to the  
inlet and outlet for the filter drier (see Fig. 19)  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment damage  
or improper operation.  
Unit failure as a result of operation on improper line voltage or  
excessive phase imbalance constitutes abuse and may cause  
damage to electrical components. Such operation could void  
any applicable Carrier warranty.  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal injury or  
death.  
A09507  
Fig. 19 -- 38QRF018--036 Connector Tube Assembly  
Before performing service or maintenance, be sure indoor unit  
main power switch is turned OFF and indoor blower has  
stopped.  
2. Perform step 2 and 3 from the 38HDF section.  
3. Remove the plastic cap from the liquid and suction service  
valve on the 38QRF unit and assemble the heating piston  
and piston cap supplied with the outdoor unit as shown in  
Fig. 20.  
Lock out and tag switch with a suitable warning label.  
Power Wiring  
1. Mount outdoor power disconnect. The unit is factory wired  
for the voltage shown on the unit nameplate. The fused dis-  
connect switch must be provided within sight of the unit,  
readily accessible, but out of reach of children. Provisions  
for locking the disconnect switch on the OFF (open) posi-  
tion is advisable. The disconnect switch must comply with  
NEC and local codes. Protect the unit and wiring using only  
the recommended fuse/circuit breaker size. See Table 10..  
2. Run power wiring from main box to disconnect per NEC  
and local codes.  
3. Run power wiring from the disconnect switch to outdoor  
unit. Use only minimum 60_C copper conductors between  
the disconnect switch and the unit for field power connec-  
tion.  
A07407  
Fig. 20 -- AccuRater (bypass type)  
Metering Device Components  
4. Route the field power wires through the conduit connection  
opening in the unit side panel and connect in junction box  
as shown in Fig 21. The unit and power wiring must be  
grounded.  
NOTE: The Teflon seal on the piston should point towards the  
liquid service valve. The size of the factory supplied piston might  
have to be adjusted for long line applications (over 80 ft / 24.4 m).  
Refer to the Duct Free Long Line Application Guide for additional  
information.  
GROUND LEAD  
GROUNDING LUG  
BLK  
SINGLE-PHASE  
CONN TO  
DISCONNECT  
PER NEC  
BLK  
4. Attach the flare end of the filter drier assembly to the piston  
cap (see Fig. 20).  
SINGLE-PHASE UNIT  
5. Connect the field supplied line set to the filter drier as-  
sembly and to the suction valve.  
6. Insulate any exposed areas between filter drier and liquid  
valve.  
BLK  
BLU  
THREE-PHASE  
CONN TO  
DISCONNECT  
PER NEC  
Complete Outdoor Power and Control Wiring  
YEL  
!
WARNING  
GROUNDING LUG  
THREE-PHASE UNIT  
GROUND LEAD  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal injury or  
death.  
LEGEND  
NEC -- National Electrical Code  
-- Splice (field)  
Field Wiring  
The unit cabinet must have an uninterrupted or unbroken  
ground to minimize personal injury if an electrical fault should  
occur. The ground may consist of electrical wire or metal  
conduit when installed in accordance with existing electrical  
codes.  
Factory Wiring  
A08251  
Fig. 21 -- Line Power Connections  
NOTE: Operating unit on improper line voltage constitutes abuse  
and could affect Carrier warranty. Do not install unit in a system  
where voltage may fluctuate above or below permissible limits.  
9
Control Wiring  
The control circuit is 24 volts AC (minimum 40VA) supplied from  
the indoor unit.  
2. Route one end of the control wiring through the opening  
provided in the unit side panel and connect to the control  
terminal strip using either Fig. 21 for 38HDF units and Fig.  
22 for 38QRF units.  
1. Make sure you have enough control wires to cover the dis-  
tance between the indoor and outdoor unit.  
Indoor  
Terminal  
Board  
Indoor  
Board  
Indoor  
Board  
Indoor  
Terminal  
Board  
Outdoor  
Terminal  
Board  
Outdoor  
Terminal  
Board  
A09509  
A09508  
Fig. 23 -- 38QRF Control Terminal Strip  
Fig. 22 -- 38HDF Control Terminal Strip  
NOTE: Use No. 18 AWG color--coded, insulated (35_C minimum) wire. If the distance between the indoor and outdoor unit is greater than  
100 ft. (30.5 m), as measured along the control voltage wires, use No. 16 AWG color--coded wire to avoid excessive voltage drop.  
10  
Table 10 – 38HDF / 38QRF Electrical Data  
38HDF /  
38QRF  
UNIT  
FUSE/  
HACR  
BKR  
COMPRESSOR  
OUTDOOR FAN MOTOR  
VOLTAGE RANGE*  
MIN CKT  
AMPS  
V --- P H --- H z  
RLA LRA  
FLA  
NEC Hp  
kW Out  
Min  
Max  
SIZE  
AMPS  
018  
024  
030  
208/230---1---60  
208/230---1---60  
208/230---1---60  
208/230---1---60  
208/230---3---60  
460 --- 3 --- 60  
187  
187  
187  
187  
187  
414  
187  
187  
414  
253  
253  
253  
253  
253  
506  
253  
253  
506  
9.0  
12.8  
14.1  
16.7  
10.4  
5.8  
48.0  
58.3  
73.0  
79.0  
79.0  
79.0  
112.0  
88.0  
44.0  
0.80  
0.80  
1.50  
1.50  
1.50  
0.80  
1.45  
1.45  
0.80  
0.125  
0.125  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.25  
0.09  
0.09  
0.19  
0.19  
0.19  
0.19  
0.19  
0.19  
0.19  
12.1  
16.8  
18.4  
22.3  
14.5  
8.7  
20  
25  
30  
35  
20  
15  
40  
30  
15  
035  
036  
208/230---1---60  
208/230---3---60  
460 --- 3 --- 60  
17.9  
13.2  
6.0  
23.8  
18.0  
8.3  
Table 11 – 40QNC, QNQ Fan Coil Electrical Data  
VOLTAGE RANGE*  
FAN  
POWER  
UNIT SIZE  
V --- P H --- H z  
Motor Power  
(Watts)  
MIN CKT  
FUSE/CKT  
BKR AMPS  
Min  
Max  
FLA  
AMPS  
0.48  
0.48  
0.55  
0.48  
0.48  
0.48  
0.55  
40QNC01824  
40QNC030  
40QNC036  
40QNQ018  
40QNQ024  
40QNQ030  
40QNQ036  
208/230---1---60  
208/230---1---60  
208/230---1---60  
208/230---1---60  
208/230---1---60  
208/230---1---60  
208/230---1---60  
187  
187  
187  
187  
187  
187  
187  
253  
253  
253  
253  
253  
253  
253  
0.38  
0.38  
0.44  
0.38  
0.38  
0.38  
0.44  
64  
74  
74  
64  
64  
74  
74  
15  
15  
15  
15  
15  
15  
15  
LEGEND:  
FLA --- Fu l l L oad Amps  
Determine maximum deviation from average voltage:  
(AB) 457---452 = 5v  
(BC) 464---457 = 7v  
LRA --- L ocked Rotor Amps  
NEC --- National Electrical Code  
RLA --- Rated Load Amps (compressor)  
(AC) 457---455 = 2v  
* Permissible limits of the voltage range at which the unit will operate  
satisfactorily  
Maximum deviation is 7v.  
NOTES:  
Determine percentage of voltage imbalance  
1. Control circuit is 24---V on all units and requires external power  
source. Copper wire must be used from service disconnect to unit.  
2. All motors/compressors contain internal overload protection.  
7
% of voltage imbalance = 100 x  
57  
=
1.53%  
3. In compliance with NEC (USA Standard) requirements for multimo-  
tor and combination load equipment (refer to NEC Articles 430 and  
440), the over current protective device for the unit shall be fuse.  
This amount of phase imbalance is satisfactory as it is below the maximum  
allowable of 2%.  
4. Motor RLA values are established in accordance with UL (Under-  
writers’ Laboratories) Standard 465 (USA Standard).  
5. 38QRF018---030 units are only available in single---phase voltage.  
IMPORTANT: Contact your local electric utility company immediately if the  
supply voltage phase imbalance is more than 2%.  
6. Unbalanced 3---Phase Supply Voltage  
Never operate a motor where a phase imbalance in supply voltage is  
greater than 2%. Use the following formula to determine the percent-  
age of voltage imbalance:  
max voltage deviation from average voltage  
average  
= 100 X  
EXAMPLE: Su ppl y vol tage is 460 --- 3 --- 60  
AB = 452v  
BC = 464v  
AC = 455v  
Average Voltage =  
=
452 + 464 + 455  
3
1371  
3
=
457  
11  
A08367  
Fig. 24 -- 40QNC01824 Matched with 38HDF Typical Wiring Schematic  
12  
Optional on 38QRF018/024 Models  
A08368  
Fig. 25 -- 40QNQ018,024 Matched with 38QRF Typical Wiring Schematic  
13  
A08369  
Fig. 26 -- 40QNC030, 036 Matched with 38HDF Typical Wiring Schematic  
14  
Optional on 38QRF0036 Models  
Standard on 38QRF030  
A08370  
Fig. 27 -- 40QNQ030, 036 Matched with 38QRF Typical Wiring Schematic  
15  
Install All Power, Interconnecting Wiring, Piping and  
Drain Hose to Indoor Unit .  
Run Power Wiring for Indoor Unit  
Be sure field wiring complies with local building codes and NEC,  
and unit voltage is within limits shown in Table 11.  
Contact local power company for correction of improper line  
voltage.  
1. Run control wiring from the outdoor unit through the access  
hole in the wall and make sure you have enough wire to  
reach the control box of the unit once hung on the mounting  
plate.  
2. It is a recommended that flare connections is located on the  
outside of the wall where the indoor unit is to be mounted.  
If an extension pipe is required to facilitate this location,  
measure, fabricate and install the extension pipes to the in-  
door unit before hanging the unit on the mounting bracket.  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal injury  
or death.  
3. If piping connections are on the outside wall, pass the pipes  
(refrigerant and drain) through the wall sleeve and then  
hook the indoor unit body on top of the wall hanging brack-  
et. Support the unit away from the bottom using a tool or a  
piece of wood.  
Before installing, modifying, or servicing system, main  
electrical disconnect switch must be in the OFF position.  
There may be more than 1 disconnect switch. Lock out and  
tag switch with a suitable warning label.  
NOTE: Tie together the refrigerant piping, the drain hose, and the  
electrical connection wires and ensure that the drain hose is at the  
bottom as shown in Fig. 28.  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment damage  
or improper operation.  
Unit failure as a result of operation on improper line voltage or  
excessive phase imbalance constitutes abuse and may cause  
damage to electrical components. Such operation could void  
any applicable Carrier warranty.  
2
3
2
3
NOTE: Use copper wire only between disconnect switch(es) and  
unit.  
NOTE: Install branch circuit disconnect of adequate size to handle  
unit starting current per NEC. Locate disconnect within sight of,  
and readily accessible from, unit, per section 440--14 of NEC.  
Some codes allow indoor unit to share disconnect with outdoor  
unit if disconnect can be locked; check local code before installing  
in this manner.  
A08364  
Fig. 28 -- Location of Piping, Hose, and Wiring  
The 40QNC/QNQ units require their own power supply.  
1. Locate the indoor power supply.  
4. If required make the flare connections.  
5. Route the power and control wiring through the back side  
of the unit and to the control box area. If the wired remote  
or zone manger accessory are to be used, perform any modi-  
fications required at this time. Refer to the Accessory install-  
ation instructions).  
6. Remove the control box cover and finish all indoor unit  
wiring connections as shown on the wiring diagram or in  
the accessory installation instructions. Replace the control  
box cover.  
2. Locate and install disconnect switch per NEC and local  
codes.  
3. Run power supply wiring to disconnect switch.  
4. Run power wiring from disconnect switch to wall mount  
area.  
5. If any accessories are being installed, refer to the individual  
accessory instructions for guidance on wire routing at this  
time.  
7. Fix the bottom part of the unit to the wall mounting bracket  
and push it carefully until the two bracket hooks fit into the  
marked places at the base of the unit until it snaps into  
place. See Fig. 29.  
16  
USER INTERFACE  
The indoor unit includes a wireless remote control to operate the  
unit (an Owner’s Manual is supplied with the unit). If you have  
two units installed in the same space and they need to work  
independently, the remote controls and the units need to be  
configured as follow:  
DIMENSION  
UNIT SIZE  
A
B
40QNC01824 13.4  
10.6  
12.2  
12.2  
10.6  
10.6  
12.2  
12.2  
40QNC030  
40QNC036  
40QNQ018  
40QNQ024  
40QNQ030  
40QNQ036  
12.2  
12.2  
13.4  
13.4  
12.2  
12.2  
Unit Configuration  
Wall  
Hanging  
Bracket  
Turn the unit off by pressing the  
. Press and hold the  
and  
Hook  
Hole  
buttons of the remote control for more than 5 seconds. The  
display will be cleared and the time segments will display the first  
configuration item (rAdr=remote address) and the temperature  
segments will display the default value of this configuration item  
R etainer  
Clip  
R etainer  
C lip  
(Ab=control of both indoor units). Press  
and  
to change the  
button to  
default value to the new value of (a) or (b). Press the  
B
A
transmit the new configuration to the unit. Press the  
leave the configuration menu.  
button to  
A08365  
Fig. 29 -- Wall Mounting Details  
Remote Control Configuration  
8. If the refrigerant piping connections are located outside the  
wall, tighten the flare connections as shown in Fig. 30. Insu-  
late all exposed refrigerant lines and secure to the wall and  
fill any void spaces in the hole.  
Turn the unit off by pressing the  
button. Press and hold the  
and buttons for more than 5 seconds. The display will be  
cleared and the time segments will display the first configuration  
item (CH=remote address) and the temperature segments will  
display the default value of this configuration item (Ab=control of  
both indoor units).  
1
Press  
and  
to change the default value to the new value of (a)  
button to transmit the new configuration to the  
button to leave the configuration menu.  
or (b). Press the  
3
Adjustable wrench or torque wrench  
unit. Press the  
Outdoor end  
NOTE: When 30 seconds have elapsed and no buttons have been  
pressed, the remote control will automatically exit the  
configuration menu and resume its normal operation.  
2
Indoor end  
A wall mounted control or zone manager can be used to control a  
unit or multiple units.  
A07201  
Fig. 30 -- Tightening Connections  
Wired Control  
If a wall mounted wired control is required the following steps  
should be performed at the same time the indoor control and power  
wiring are being connected:  
1. Unplug the connector on J5.  
2. Remove the wire harness from the wired control box  
3. Plug one end of the wire harness into the J5 connector on  
the board  
4. Route the other end of the wire harness to the back of the  
unit along the low voltage wiring  
5. Connect the other end of the wire harness to the field sup-  
plied wiring between the indoor unit and the wired control  
as shown in wired control installation instructions and Fig.  
31.  
17  
A09512  
Fig. 31 -- Control Wiring Between Indoor and Outdoor Units  
Up to six units can be daisy--chained and controlled from one wired control.  
*
* 100 ohm Resistor  
A09513  
Fig. 32 -- Multiple Unit Control Wiring  
18  
Zone Manager  
If a Zone Manager is required, the following steps should be  
performed at the same time the indoor control and power wiring  
are being connected:  
3. Route the other end of the wire harness along the voltage  
control to the back of the unit.  
4. Connect the other end of the wire harness to the field sup-  
plied wiring that will be connected to the zone manager as  
shown in Fig. 33. (Shielded cables are required. Refer to  
Zone Manager Installation Instructions for further informa-  
tion.)  
1. Plug the communication board to the J8 as shown in Fig. 33  
2. Connect one end of the wire harness supplied with the Zone  
Manager to the communication board.  
A09514  
Fig. 33 -- Wiring for Zone Manager  
19  
START--UP  
Preliminary Checks  
Manifold Gage  
1. Check condensate drainage system; on the opposite side of  
the drain connection, insert a water bottle up into the fan  
coil unit and fill the drain pan. Water must flow steadily; if  
not, check the pipe slope or inspect for any pipe restrictions.  
500 microns  
Low side valve  
High side valve  
Charge hose  
2. Make sure all wiring connections are correct and they are  
tight.  
Charge hose  
3. Field electrical power source must agree with unit name  
plate rating.  
Vacuum pump  
4. Check that all barriers, covers, and panels are in place. En-  
sure that the filters and return--air grilles on the indoor unit  
have been installed and that the discharge louvers are posi-  
tioned correctly.  
Low side valve  
Fig. 35 -- Manifold  
5. All service valves must be closed.  
A07361  
6. On units with crankcase heaters, ensure belly--band heaters  
are tight around the compressor.  
Deep Vacuum Method  
Evacuate and Dehydrate the System  
The deep vacuum method requires a vacuum pump capable of  
pulling a vacuum of 500 microns and a vacuum gage capable of  
accurately measuring this vacuum depth. The deep vacuum method  
is the most positive way of assuring a system is free of air and  
liquid water. (See Fig. 36)  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment damage  
or improper operation.  
5000  
4500  
4000  
Never use the system compressor as a vacuum pump.  
Using Vacuum Pump  
LEAK IN  
3500  
SYSTEM  
1. Completely tighten flare nuts A, B, C, D, connect manifold  
gage charge hose to a charge port of the low side service  
valve. (See Fig. 34.)  
2. Connect charge hose to vacuum pump.  
3. Fully open the low side of manifold gage. (See Fig. 35)  
4. Start vacuum pump  
3000  
2500  
2000  
1500  
1000  
VACUUM TIGHT  
TOO WET  
TIGHT  
500  
DRY SYSTEM  
5. Evacuate using either deep vacuum or triple evacuation  
method.  
0
1
2
3
4
5
6
7
6. After evacuation is complete, fully close the low side of  
manifold gage and stop operation of vacuum pump.  
MINUTES  
A95424  
Fig. 36 -- Deep Vacuum Graph  
7. The factory charge contained in the outdoor unit is good for  
up to 25 ft. (8 m) of line length. For refrigerant lines longer  
than 25 ft (8 m), add 0.3 oz. per foot of extra piping up to  
the maximum allowable length.  
8. Disconnect charge hose from charge connection of the low  
side service valve.  
9. Fully open service valves B and A.  
10. Securely tighten caps of service valves.  
Indoor Unit  
C
Refrigerant  
Low Side  
Outdoor Unit  
A
B
D
High Side  
Service Valve  
Fig. 34 -- Service Valve  
A07360  
20  
Triple Evacuation Method  
Set Unit in Test Mode Using Wireless Control  
Turn power on to the unit. Insert batteries in remote control. Press  
The triple evacuation method should only be used when vacuum  
pump is only capable of pumping down to 28 in. of mercury  
vacuum and system does not contain any liquid water.  
Refer to Fig. 37 and proceed as follows:  
the  
and the  
buttons on the remote control for 5 seconds.  
The remote control will be cleared and the time segment will  
1. Pump system down to 28 in. of mercury and allow pump to  
continue operating for an additional 15 minutes.  
display the Src1=service test mode. Press the button to  
transmit the service test signal to the unit. After the test has  
2. Close service valves and shut off vacuum pump.  
3. Connect a nitrogen cylinder and regulator to system and  
open until system pressure is 2 psig.  
completed press the button to leave the test menu.  
NOTE: When 30 seconds have elapsed and no buttons have been  
pressed, the remote control will automatically exit the test menu  
and resume its normal operation.  
4. Close service valve and allow system to stand for 1 hr. Dur-  
ing this time, dry nitrogen will be able to diffuse throughout  
the system absorbing moisture.  
5. Repeat this procedure as indicated in Fig. 37. System will  
then be free of any contaminants and water vapor.  
Set Unit in Test Mode Using Wired Control  
There is a hidden service test mode that is initiated through a  
combination of button presses when the remote is off. The  
following combination must be pressed within a 6 second period:  
EVACUATE  
“DOWN--FAN--UP--FAN--MODE”  
Once in service test mode, the service test mode message will be  
sent and “Sr” will be displayed in the temperature icons until the  
“DOWN” button is pressed.  
BREAK VACUUM WITH DRY NITROGEN  
WAIT  
During Service Test mode, all the icons are off. the only button  
that is active is the “DOWN” button.  
To cancel Service Test mode, press the “DOWN” button to send a  
normal message with “OFF” mode.  
Service Test mode automatically times out after 30 minutes and the  
remote will operate normally.  
EVACUATE  
BREAK VACUUM WITH DRY NITROGEN  
WAIT  
EVACUATE  
Test Mode Sequence of Operation  
CHECK FOR TIGHT, DRY SYSTEM  
(IF IT HOLDS DEEP VACUUM)  
Once unit is in TEST MODE, all remote control messages are  
ignored except for a message to turn the unit OFF. Buzzer will  
beep twice.  
RELEASE CHARGE INTO SYSTEM  
When in TEST MODE, the unit will operate as follows:  
A95425  
1. The unit Status (Green) and Timer (Yellow) LEDs will  
blink every 2 seconds  
Fig. 37 -- Triple Evacuation Method  
To Start the Unit:  
1. If the outdoor unit is equipped with a crankcase heater, turn  
on the indoor and outdoor disconnect switches to supply  
power the system 12 hours before starting the system.  
2. Release charge into the system by opening (back--seating)  
liquid and suction line service valves.  
GREEN  
YELLOW  
3. Set the wireless remote control or wired remote control be-  
low ambient temperature. Operate the unit for 15 minutes.  
A09594  
Fig. 38 -- LED Display  
4. Refer to Table 6 to determine if additional charge is re-  
quired. Also, if you have a long line application, refer to the  
Duct Free Long Line Application Guide to determine the  
additional charge that is required beyond 25 ft (7.6 m).  
2. Indoor fan will operate according to user – selected speed. If  
Auto fan is selected, the fan will run in High speed  
3. Cooling only system  
a. Unit will operate in cool mode with demand  
b. Louver will operate according to user -- selected posi-  
tion or in cool position if louvers are set to Auto  
5. Calculate the total additional charge required and weigh in.  
6. Charge should be added as liquid (not gas) slowly and care-  
fully to low side to avoid liquid slugging.  
4. Heat pump system  
7. Start unit with operation test. In test mode the unit will run  
in cooling and heating (on heat pumps) regardless if there is  
demand or not.  
a. Unit will run in cooling mode with demand for 3  
minutes  
b. Unit will run in heat pump mode with demand for 2  
minutes or until indoor coil temperature is greater than  
104_F (40_C). If coil temperature reaches 104_F  
(40_C), the unit will run in cool mode until test mode is  
exited.  
c. Louver will operate according to user -- selected posi-  
tion or in cool/heat position if louvers are set to Auto.  
5. Following will cancel Test Mode:  
a. Unit is turned off by controller  
b. Power is cycled during Test Mode  
c. 30 minutes elapsed  
d. Fail Mode  
21  
Refrigerant Charging  
SERVICE  
!
!
WARNING  
WARNING  
PERSONAL INJURY AND/OR EQUIPMENT  
DAMAGE HAZARD  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal  
injury or death.  
Failure to follow this warning could result in personal  
injury and/or equipment damage.  
Before installing, modifying, or servicing system, main  
electrical disconnect switch must be in the OFF  
position. There may be more than 1 disconnect switch.  
Lock out and tag switch with a suitable warning label.  
Wear safety glasses and gloves when handling  
refrigerant. Do not overcharge system -- this can cause  
compressor flooding.  
All units are shipped with the refrigerant charge listed on  
nameplate.  
Pump-down Procedure  
The system may be pumped down in order to make repairs on the  
low side without losing complete refrigerant charge.  
NOTE:  
Do not vent or depressurize unit refrigerant to  
atmosphere. Remove and recover refrigerant following accepted  
practices.  
1. Attach pressure gage to suction service valve gage port.  
2. Front--seat the mixed phase line valve.  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment damage  
or improper operation.  
The unit coils hold only the factory--designated amount of  
refrigerant. Additional refrigerant may cause units to relieve  
pressure through the compressor internal pressure relief valve  
(indicated by a sudden rise of suction pressure) before suction  
pressure reaches 20 psig. If this occurs, shut off unit  
immediately then front--seat the suction valve and remove and  
recover excess refrigerant following accepted practices.  
3. Start unit and run until suction pressure reaches 5 psig.  
4. Shut unit off and front--seat suction valve.  
5. Depressurize low side of unit and recover refrigerant fol-  
lowing accepted practices.  
Filter Drier  
Whenever the filter drier is exposed to the atmosphere it must be  
replaced. Only use factory specified liquid--line filter driers with  
rated working pressures less than 600 psig.  
NOTE: Do not install a suction--line filter drier in the mixed phase  
line.  
22  
TROUBLESHOOTING  
See Table 12 and Table 13 for troubleshooting information.  
Fault Code  
Once a failure occurs with the indoor unit in operation, the green LED on the indoor unit flashes at intervals of 0.5 seconds. The fault code is  
deduced from the number of times the green LED flashes, blocking unit operation. Between one flash cycle and the next one, a pause of 3  
seconds elapses.  
Table 12 – Green LED (Indoor Unit Fault)  
CODE  
3
4
DESCRIPTION  
Room Air Sensor Fault  
Indoor Unit Coil Sensor Fault  
Outdoor Unit Air Sensor Fault  
14  
Table 13 – Troubleshooting  
PROBLEM  
POSSIBLE CAUSE  
Unit not energized  
Main switch is set to OFF  
Main switch fuses are blown  
Compressor cycling protection is on  
Main power voltage is too low  
Electrical connections are too loose or are wrong  
Electrical connections of compressor are loose or  
wrong  
SOLUTION  
Check the main power connection.  
Check and put it to ON position.  
Replace fuses.  
Wait for 3 minutes.  
Check and set to the correct voltage.  
Check and tighten or correct connections.  
Compressor and Fan of the Outdoor  
Unit Will Not Start  
Compressor Will Not Start, But Out-  
door Fan is Operating  
Check and tighten or repair compressor.  
Compressor burnt out; seized or protection device  
on  
Check for the cause and replace compressor if neces-  
sary.  
Wrong refrigerant charge in unit (excessive or low)  
or air or other non---condensable gasses in the  
circuit  
Drain refrigerant, evacuate and recharge. CAUTION: Do  
not vent refrigerant to the atmosphere; use refrigerant  
recovery equipment.  
Main voltage is too high or too low  
Condenser coil obstructed  
Outdoor fan off  
Wrong indoor unit thermistors  
Refrigerant circuit clogged  
Check voltage setting and adjust if necessary.  
Remove obstruction.  
Check cause and resume operation or repair.  
Replace thermistors.  
Compressor Stops Due to Over---tem-  
perature  
Check and remove obstructions.  
Reversing valve faulty on heat pump models  
Replace reversing valve.  
Drain refrigerant, evacuate and recharge. CAUTION: Do  
not vent refrigerant to the atmosphere; use refrigerant  
recovery equipment.  
Expansion device clogged or covered with ice  
Unit selected is too small for application require-  
ments  
Contact a qualified service technician for a system evalu-  
ation.  
Indoor temperature setting too low or too high  
Outdoor unit fan faulty  
Check temperature setting.  
Replace outdoor fan.  
Drain refrigerant, evacuate and recharge. CAUTION: Do  
not vent refrigerant to the atmosphere; use refrigerant  
recovery equipment.  
Compressor Runs Continuously  
Air or other non---condensable gasses in the cir-  
cuit  
Obstructions at air intake or dirty indoor unit filters  
Outdoor fan is stopped  
Remove obstruction and/or clean filter.  
Fr e q u e n t I c e --- B u i l d --- U p o n O u t d o o r  
Coil  
Check cause and repair.  
Outdoor coil dirty or obstructed  
Condenser fan faulty  
Indoor temperature setting too low or too high  
Clean or remove obstructions.  
Replace condenser fan.  
Check temperature setting.  
Discharge Pressure Too High  
Drain refrigerant, evacuate and recharge. CAUTION: Do  
not vent refrigerant to the atmosphere; use refrigerant  
recovery equipment.  
Air or other non---condensable gasses in the cir-  
cuit  
Indoor temperature setting too high or too low  
Outdoor coil dirty or obstructed  
Indoor unit air filter dirty  
Indoor temperature setting too high or too low  
Reversing valve faulty or internal leak  
Indoor temperature setting too high or too low  
Check temperature setting.  
Clean or remove obstructions.  
Clean filter.  
Check temperature setting.  
Replace reversing valve.  
Discharge Pressure Too Low  
Suction Pressure Too High  
Check temperature setting.  
Air circulation on the evaporator not sufficient; check and  
repair.  
Evaporator coil covered with ice  
Suction Pressure Too Low  
Expansion device or suction line clogged  
Outdoor fan does not stop during defrost periods  
Electrical connection loose  
Check and repair.  
Check electrical parts.  
Check connections.  
Replace.  
Fan motor burn out  
Outdoor Fan Cycling Due to Over---  
Te mp e rature Pro te ctio n  
Fan bearing seized  
Check and repair.  
Drain refrigerant, evacuate and replace.  
CAUTION: Do not vent refrigerant to the atmosphere; use  
refrigerant recovery equipment.  
Expansion device clogged or covered with ice  
23  
C a t a l o g N o : 4 0 Q N C --- Q --- 9 S I  
Copyright 2009 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231  
Printed in U.S.A.  
Edition Date: 09/09  
Replaces: 40QN---8SI  
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.  
24  

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