Carrier Ceiling Suspended Duct Free Split System 40QAC User Manual

40QAC / 38HDR  
40QAQ / 38QRR  
Ceiling---Suspended Duct Free Split System  
Sizes 018 to 060  
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.  
40QAC, QAQ Unit  
!
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.  
!
WARNING  
the environmentally sound refrigerant  
ELECTRICAL SHOCK HAZARD  
38HDR, QRR Unit  
Failure to follow this warning could result in personal  
injury or death.  
NOTE: Read the entire instruction manual before starting the  
installation.  
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.  
!
WARNING  
UNIT OPERATION AND SAFETY HAZARD  
!
CAUTION  
Failure to follow this warning could result in personal injury or  
equipment damage.  
PERSONAL INJURY AND EQUIPMENT DAMAGE  
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 caution may result in personal injury  
and / or equipment damage.  
DO NOT operate the unit without a filter or with grille  
removed.  
4 6 0 - 3 - 6 0  
2 0 8 / 2 3 0 - 3 - 6 0  
2 3 0 - 1 - 6 0  
2 0 8 - 2 3 0 - 1 - 6 0  
3
4 6 0 - 3 - 6 0  
2 0 8 / 2 3 0 - 3 - 6 0  
2 3 0 - 1 - 6 0  
2 0 8 - 2 3 0 - 1 - 6 0  
4
4 6 0 - 3 - 6 0  
2 0 8 / 2 3 0 - 3 - 6 0  
2 3 0 - 1 - 6 0  
2 0 8 - 2 3 0 - 1 - 6 0  
5
4 6 0 - 3 - 6 0  
2 0 8 / 2 3 0 - 3 - 6 0  
2 3 0 - 1 - 6 0  
2 0 8 - 2 3 0 - 1 - 6 0  
6
These installation instructions cover the installation of the matched  
systems listed in table 2.  
Table 2 – Matched Systems  
System  
Type  
Nominal  
Capacity  
Outdoor Unit  
Indoor Unit  
Parts List  
Indoor Unit  
40QAC 024 --- --- --- 3  
*
018  
38HD R018 --- --- --- 3  
024  
030  
036  
048  
060  
018  
024  
030  
036  
048  
060  
38HD R024 --- --- --- 3  
38HD R030 --- --- --- 3  
40QAC 024 --- --- --- 3  
40QAC 036 --- --- --- 3  
40QAC 036 --- --- --- 3  
40QAC 048 --- --- --- 3  
40QAC 060 --- --- --- 3  
40QAQ024 --- --- --- 3  
40QAQ024 --- --- --- 3  
40QAQ036 --- --- --- 3  
40QAQ036 --- --- --- 3  
40QAQ048 --- --- --- 3  
40QAQ060 --- --- --- 3  
The following items are included with the indoor unit:  
Table 1 – Installation Materials  
38HDR036--- --- ---3/5/6  
38HDR048--- --- ---3/5/6  
38HDR060--- --- ---3/5/6  
38QRR018 --- --- --- 3  
Part No.  
Name of Part  
Side Panels  
Hex Head Bolts  
Mounting Bracket  
Pistons  
Qty.  
2
4
2
1
1
2
3
4
5
6
38QRR024 --- --- --- 3  
38QRR030 --- --- --- 3  
Installation Template  
Adapter Tubes  
1
2
38QRR036--- --- ---3/5/6  
38QRR048--- --- ---3/5/6  
38QRR060--- --- ---3/5/6  
* Units must be configured for 1---1/2 ton operation. Refer to instructions  
on page 9.  
SYSTEM REQUIREMENTS  
Clearances  
Allow sufficient space around the indoor and outdoor unit for  
proper airflow circulation and servicing. Refer to Fig. 1 through  
Fig. 5 for minimum required clearances.  
Piping: Piping and insulation is field supplied.  
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.  
A09532  
Fig. 6 -- Hanging Fan Coil Unit  
Table 3 – Maximum Refrigerant Line Lengths  
Unit  
Size  
Max Line  
Length ft(m)  
Max Elevation (ID  
over OD) ft(m)  
Max Elevation (OD  
over OD) ft(m)  
Outdoor Unit  
The following items are included with the outdoor unit:  
18K  
24K  
30K  
36K  
48K  
60K  
200 (61)  
200 (61)  
200 (61)  
200 (61)  
200 (61)  
200 (61)  
65 (19.8)  
65 (19.8)  
65 (19.8)  
65 (19.8)  
65 (19.8)  
65 (19.8)  
200 (61)  
200 (61)  
200 (61)  
200 (61)  
200 (61)  
200 (61)  
Note:For lengths greater than 25 ft (7.6 m), refer to the Duct Free Long  
Line Guide.  
Pipe Sizes  
Refer to table 4 for pipe sizes.  
A09536  
Table 4 – Pipe Sizes  
Fig. 7 -- 38HDR018--036  
PIPE SIZES (in)  
Vapor  
Unit Size  
Liquid Phase  
38HDR  
5/8  
38QRR  
5/8  
5/8  
3/4  
3/4  
3/4  
3/4  
18  
24  
30  
36  
48  
60  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
5/8  
3/4  
3/4  
7/8  
7/8  
Note:On heat pumps, both lines need to be insulated using at least 1/2 inch  
closed foam insulation.  
A09537  
Fig. 8 -- 38QRR018--036  
Piston  
Cap  
---  
Flare  
Model  
Filter Drier  
Pistons  
Connector  
38HDR  
38QRR  
n
n
---  
n
---  
n
n
7
Refrigerant Charge  
Power and Connecting Cables -- Field Supplied  
The 38HDR and 38QRR units can be matched with multiple  
outdoor units and thus additional charge might be required when  
matched with the 40QAC or 40QAQ units.  
Power:  
S The main power is supplied to both the indoor and outdoor  
units.  
Table 5 – Additional Charge  
S Consult local building codes, NEC (National Electric Code) or  
CEC (Canadian Electric Code) for any special requirements.  
S Use Table 7 for the electrical requirements for the outdoor units  
and Table 8 for the indoor units to correctly size the cables and  
disconnect switches.  
Additional Charge lb. (kg.)  
Unit Size  
018  
024  
030  
036  
38HDR  
0.7 (0.32)  
1.3 (0.59)  
1.4 (0.64)  
0.2 (0.1)  
0.2 (0.1)  
0.5 (0.23)  
38QRR  
0.7 (0.32)  
0.8 (0.36)  
0
0.5 (0.23)  
048  
060  
0
0
Control Wiring  
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 200 ft  
(61.0 m).  
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.  
Metering Device  
The 40QAC and 40QAQ units use an accurator or a TXV as  
shown in Table 6.  
User Interface -- Finished Goods Accessory  
Any of the following three thermostats can be used depending on  
the type of system on hand and the desired features. Refer to Table  
9 to select the proper thermostat.  
Table 6 – Accurator Sizes  
Cooling Only  
40QAC  
TVX  
Heat Pumps  
Unit Size  
40QAQ  
38QRR  
018  
024  
030  
036  
048  
060  
49  
55  
65  
70  
80  
TXV  
40  
43  
55  
63  
73  
80  
TVX  
TVX  
TVX  
TVX  
TVX  
NOTE: Pistons are supplied with either the indoor or outdoor units.  
Table 7 – 38HDR / QRR Electrical Requirements  
38HDR  
FUSE/HACR BKR  
38QRR  
UNIT SIZE  
V --- P H --- H z  
MIN CKT AMPS  
MIN CKT AMPS  
FUSE/HACR BKR AMPS  
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  
12.1  
17.7  
19.1  
19.1  
13.0  
7.9  
20  
12.1  
18.8  
17.5  
20.9  
14.1  
7.9  
20  
30  
30  
30  
20  
15  
50  
30  
15  
60  
40  
15  
25  
30  
30  
20  
036  
048  
060  
15  
208/230---1---60  
208/230---3---60  
460 --- 3 --- 60  
26.4  
17.9  
8.4  
40  
34.6  
22.4  
10.0  
34.5  
23.6  
10.6  
25  
15  
208/230---1---60  
208/230---3---60  
460 --- 3 --- 60  
34.5  
21.5  
10.6  
60  
30  
15  
Table 8 – 40QAC / QAQ Electrical Requirements  
40QAC  
40QAQ  
MOCP  
15.0  
VOLTAGE  
UNIT  
V --- P h --- 6 0 H z  
MCA  
0.63  
1.60  
2.00  
3.30  
MOCP  
15.0  
MCA  
9.29  
024  
036  
048  
060  
208/230---1  
208/230---1  
208/230---1  
208/230---1  
15.0  
17.70  
23.80  
28.70  
20.0  
15.0  
25.0  
15.0  
30.0  
Table 9 – Thermostat Selection  
System Type  
Model Number  
Cooling Only & HP  
53DFS250---SL  
Cooling Only  
53DFS250---FS  
Cooling Only  
53DFST2---NP  
7 Day Programmable  
5+1+1 Day Programmable  
Remote Room Sensor  
Dry Contact Equipped  
---  
---  
---  
---  
8
Operating Range  
INSTALL INDOOR UNIT  
Ensure that the system operates within the application guidelines  
shown in the following tables.  
Plan the installation carefully before you begin.  
1. Select indoor unit location. If possible, place the unit adja-  
cent to an outside wall if fresh air is required, and ensure  
that the location allows for complete air distribution.  
NOTE: If unit is not installed adjacent to an outside  
wall and fresh air is required, a power ventilation kit ac-  
cessory is available.  
Cooling operating range:  
Maximum  
Minimum  
DB  
_F (_C)  
WB  
_F (_C)  
DB  
_F (_C)  
WB  
_F (_C)  
125  
55  
Outdoor Unit  
Indoor Unit  
---  
---  
(51.7)  
(12.8)  
2. Remove the indoor unit from the carton and place it upside  
down and perform the following steps:  
95  
(35)  
71  
(21.7)  
67  
(19.4)  
57  
(13.9)  
a. Remove side panels by sliding forward, then away from  
sides of the unit . See Fig. 9.  
Heating operating range:  
Maximum  
Minimum  
DB  
_F (_C)  
WB  
_F (_C)  
DB  
_F (_C)  
WB  
_F (_C)  
75  
67  
--- 20  
Outdoor Unit  
---  
---  
(23.9)  
(19.4)  
(---28.9)  
80  
(26.7)  
71  
(21.7)  
55  
(12.8)  
Indoor Unit  
Accessories  
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  
installation instructions for the accessories.  
Some of the  
accessories, especially on the indoor units, can be installed much  
easier if planned ahead.  
A09525  
Fig. 9 -- Removal of Mounting Brackets from Indoor Unit  
INSTALLATION  
Complete Pre--installation Checks  
b. Remove air filters from inlet grilles; then remove and  
retain screws securing inlet grilles to indoor unit.  
c. Remove inlet grilles from indoor unit by sliding for-  
ward.  
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 page 7). 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.  
d. If a size 024 indoor unit is to be matched with a size  
018 outdoor unit, switch the Molex plug on the motor.  
The Molex plugs are labeled as 018 or 024.  
e. Loosen hex bolts on the side of the unit and remove the  
mounting brackets by sliding them out in direction  
shown in Fig. 10. Allow approximately 3/8 inch space  
between the bolt head and the unit as shown in Fig. 10.  
Consider System Requirements  
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.  
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.1 through Fig. 5.  
A09527  
Fig. 10 -- Installing Hex--Head Mounting Bolts  
in Fan Coil Unit  
5. Condensate piping can be directed through the inside wall  
to an approved drain or straight outside.  
f. If piping is going to be run from the right hand side,  
open knock--out by removing the pre--split portion in  
the rear of the right hand side panel with a saw or cutter  
knife.  
9
3. Mount Unit -- the installation location should have already  
been identified taking into account the piping length, wiring  
and piping,connections, and clearances.  
a. Use mounting template, included inside box, to locate  
mounting bolt holes, piping holes, electrical connec-  
tions, and accessory outdoor intake, if used. See Fig. 11  
and Fig. 12.  
DIMENSIONS in. (cm)  
Unit Size  
024  
B
46  
C
49---5/8  
(126.0)  
57---1/2  
(146.1)  
(116.8)  
53---7/8  
(136.8)  
036  
DIMENSIONS in. (cm)  
Unit Size  
66---5/8  
(169.2)  
87  
70---1/4  
(178.4)  
90---5/8  
(230.2)  
048  
A
B
C
50---15/16  
46  
49---5/8  
(126.0)  
57---1/2  
(146.1)  
70---1/4  
(178.4)  
90---5/8  
(230.2)  
060  
024  
036  
048  
060  
(221)  
(129.4)  
(116.8)  
53---7/8  
(136.8)  
58---13/16  
(149.4)  
* --- Concealed mounting holes  
{ --- E xposed mou n tin g h ol es.  
71---9/16  
(181.8)  
92  
66---5/8  
(169.2)  
87  
A09046  
Fig. 12 -- Mounting Included with Fan Coil Unit  
(233.7)  
(221)  
A09528  
NOTE: If fresh air is required, a minimum of 3 inch (76.2 mm)  
Fig. 11 -- Fan Coil Unit Hanging Dimensions  
clearance is required in back of unit.  
b. Mount hanging brackets on ceiling (see Fig. 13) for  
either concealed or exposed bolt hanging position.  
A09530  
Fig. 13 -- Mounting Hanging Brackets  
10  
When mounting brackets, select the proper type of hardware from  
the guidelines below. See Fig. 14  
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.  
3. Position unit so water or ice from roof does not fall directly  
onto unit.  
!
CAUTION  
EQUIPMENT  
PERSONAL  
DAMAGE HAZARD  
INJURY  
AND/OR  
Failure to follow this caution may result in personal injury  
and / or equipment damage.  
Solid structure in ceiling MUST be used due to weight of the  
unit.  
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.  
Mounting on Roof  
Wooden Structure:  
Install hanging bolts on a square wooden piece placed over beams.  
Newly Built Concrete Slab:  
Install hanging bolts with inserts, embedded bolts, etc.  
Metal Structure:  
!
CAUTION  
PERSONAL  
DAMAGE HAZARD  
INJURY  
AND/OR  
EQUIPMENT  
Install hanging bolts utilizing an existing angle or by installing a  
new support angle.  
Previously Built Concrete Slab:  
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.  
Install hanging bolts with expansion anchor.  
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 15. See Fig. 2  
through Fig. 5 for center of gravity reference  
2. Mount unit on a solid concrete pad or platform.  
3. Isolate unit and piping from structure  
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.  
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.  
A09526  
Fig. 14 -- Fan Coil Unit Mounting Methods  
(hardware is field--supplied)  
c. Drill holes for routing refrigerant lines, condensate line  
and electrical and control connections.  
d. Lift the unit into place, and fit the hex--head bolts on  
sides of indoor unit into mounting slots of mounting  
brackets. Ensure unit is mounted with a slight tilt to the  
rear side for proper drainage.  
e. Tighten indoor unit hex--head bolts securely.  
INSTALL OUTDOOR UNIT  
The outdoor units can be installed on the ground, on the roof, or  
mounted on a wall.  
A07396  
Fig. 15 -- Lifting Unit with Sling  
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.  
Mounting Unit on Wall  
The units can also be mounted on the wall using the accessory  
mounting kit.  
11  
Complete Outdoor Refrigerant Piping Connec-  
tions  
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  
Failure to follow this caution may result in equipment  
damage or improper operation.  
NOTE: Teflon Seal must face toward the outdoor heat pump unit.  
A09538  
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.  
Fig. 16 -- AccuRater Metering Device at Service  
Valve (Bypass Type Components),  
Heat Pump Systems Only  
NOTE: The Teflon seal on the piston should point towards the  
liquid service valve.  
The size of the factory supplied piston might have to  
adjusted for long line applications (over 80 ft / 24.4 m).  
Refer to the Duct Free Long Line Application Guide  
for additional information.  
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.  
3. On cooling only units, insulate the liquid line. On heat  
pumps, insulate both lines. A minimum of 1/2 inch foam  
pipe insulation is recommended.  
4. Run the refrigerant tubes as directly as possible and avoid  
unnecessary turns and bends.  
3. On 38HDR units, remove the plastic caps on the liquid and  
suction service valves. Braze the completed filter drier as-  
sembly (from Step 1) to the liquid service valve. On the  
38QRR unit, connect the completed filter drier assembly  
(from Step 1) to the piston cap.  
5. Suspend refrigerant tubes to avoid damage to insulation or  
tubes so they do not transmit vibration to the structure.  
4. Braze the field supplied line set to the filter drier assembly  
and to the suction 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. Insulate any exposed areas between the filter drier and the  
liquid valve.  
Complete Outdoor Power and Control Wiring  
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.  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
Connection at Outdoor Unit  
Failure to follow this warning could result in personal injury or  
death.  
!
CAUTION  
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.  
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.  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment damage  
or improper operation.  
1. Braze the connector tubes (field supplied for the 38HDR  
units and factory supplied for the 38QRR units) to the inlet  
of the factory supplied filter drier. If a cooling only unit is  
being installed move to step 3 (see Fig. 8).  
2. Remove the plastic cap from the liquid and suction service  
valve on the 38QRR unit and assemble the heating piston  
and piston cap supplied with the outdoor unit as shown in  
Fig. 16.  
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.  
12  
GROUND LEAD  
GROUNDING LUG  
BLK  
!
WARNING  
SINGLE-PHASE  
CONN TO  
DISCONNECT  
PER NEC  
ELECTRICAL SHOCK HAZARD  
BLK  
Failure to follow this warning could result in personal injury or  
death.  
SINGLE-PHASE UNIT  
Before performing service or maintenance, be sure indoor unit  
main power switch is turned OFF and indoor blower has  
stopped.  
BLK  
BLU  
Lock out and tag switch with suitable warning label.  
THREE-PHASE  
CONN TO  
DISCONNECT  
PER NEC  
Power Wiring  
YEL  
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..  
GROUNDING LUG  
THREE-PHASE UNIT  
GROUND LEAD  
LEGEND  
NEC -- National Electrical Code  
-- Splice (field)  
Field Wiring  
Factory Wiring  
A08251  
2. Run power wiring from main box to disconnect per NEC  
and local codes.  
Fig. 17 -- Line Power Connections  
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.  
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.  
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 17. The unit and power wiring must be  
grounded.  
Control Wiring  
The control circuit is 24 volts AC (minimum 40VA) supplied from  
the indoor unit.  
1. Make sure you have enough control wires to cover the dis-  
tance between the indoor and outdoor 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. 18 for 38HDR units and Fig.  
19 for 38QRR units.  
Y1  
A09603  
A09509  
Fig. 18 -- 38HDR Typical Control Circuit Connections  
Fig. 19 -- 38QRR Typical Control Circuit Connections  
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.  
13  
ELECTRICAL DATA  
Table 10 – 38HDR Electrical Data  
VOLTAGE RANGE*  
COMPRESSOR  
OUTDOOR FAN MOTOR  
38HDR  
MIN CKT  
AMPS  
FUSE/HACR  
BKR AMPS  
V --- P H --- H z  
UNIT SIZE  
Min  
187  
187  
187  
187  
187  
414  
187  
187  
414  
187  
187  
414  
Max  
253  
253  
253  
253  
253  
506  
253  
253  
506  
253  
253  
506  
RLA  
9.0  
LRA  
48.0  
58.3  
73.0  
77.0  
71.0  
38.0  
109.0  
83.1  
41.0  
134.0  
110.0  
52.0  
FLA  
0.8  
0.8  
1.5  
1.5  
1.5  
0.8  
1.5  
1.5  
0.8  
1.5  
1.5  
0.8  
NEC Hp  
0.125  
0.125  
0.25  
kW Out  
0.09  
0.09  
0.19  
0.19  
0.19  
0.19  
0.19  
0.19  
0.19  
0.19  
0.19  
0.19  
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  
12.1  
17.7  
19.1  
19.1  
13.0  
7.9  
20  
25  
30  
30  
20  
15  
40  
25  
15  
60  
30  
15  
13.5  
14.1  
14.1  
9.2  
0.25  
0.25  
036  
048  
060  
5.6  
0.25  
208/230---1---60  
208/230---3---60  
460 --- 3 --- 60  
19.9  
13.1  
6.1  
0.25  
26.4  
17.9  
8.9  
0.25  
0.25  
208/230---1---60  
208/230---3---60  
460 --- 3 --- 60  
26.4  
15.0  
7.8  
0.25  
34.5  
21.5  
10.6  
0.25  
0.25  
Table 11 – 38QRR Electrical Data  
VOLTAGE  
RANGE*  
COMPRESSOR  
OUTDOOR FAN MOTOR  
38QRR  
MIN CKT  
FUSE/HACR BKR  
AMPS  
V --- P H --- H z  
UNIT SIZE  
AMPS  
RLA  
LRA  
FLA  
NEC Hp  
kw Out  
Min  
Max  
253  
253  
253  
253  
253  
506  
253  
253  
506  
253  
253  
506  
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  
187  
187  
414  
9.0  
14.4  
12.8  
15.5  
10.1  
5.6  
48.0  
58.3  
64.0  
77.0  
71.0  
38.0  
117.0  
83.1  
41.0  
134.0  
110.0  
52.0  
0.8  
0.8  
1.5  
1.5  
1.5  
0.8  
1.5  
1.5  
0.8  
1.5  
1.5  
0.8  
0.125  
0.125  
0.25  
0.25  
0.25  
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  
0.19  
0.19  
0.19  
12.1  
18.8  
17.5  
20.9  
14.1  
7.9  
20  
30  
30  
30  
20  
15  
50  
30  
15  
60  
40  
15  
036  
048  
060  
208/230---1---60  
208/230---3---60  
460 --- 3 --- 60  
26.5  
16.7  
7.3  
34.6  
22.4  
10.0  
34.5  
23.6  
10.6  
208/230---1---60  
208/230---3---60  
460 --- 3 --- 60  
26.4  
17.7  
7.8  
Table 12 – 40QAC/QAQ Electrical Data  
VOLTAGE  
RANGE*  
MINIMUM  
WIRE SIZE  
(AWG)  
HEATER  
POWER  
VOLTAGE  
FAN  
FLA  
UNIT  
V --- P h --- 6 0 H z  
MIN.  
MAX.  
253  
253  
253  
253  
253  
253  
253  
253  
kW  
FLA  
MCA  
0.63  
MOCP  
15.0  
15.0  
15.0  
15.0  
15.0  
20.0  
25.0  
30.0  
FLA  
40QAC024---3  
40QAC036---3  
40QAC048---3  
40QAC060---3  
40QAQ024---3  
40QAQ036---3  
40QAQ048---3  
40QAQ060---3  
208/230---1  
208/230---1  
208/230---1  
208/230---1  
208/230---1  
208/230---1  
208/230---1  
208/230---1  
187  
187  
187  
187  
187  
187  
187  
187  
0.50  
1.30  
0.50  
1.30  
14  
14  
14  
14  
14  
14  
12  
10  
1.60  
1.60{  
2.60}  
0.50  
2.00  
1.60  
3.30  
2.60  
2.00  
3.00  
4.00  
5.00  
8.66  
13.00  
17.40  
21.70  
9.29  
11.29  
14.30  
19.00  
24.30  
1.30  
17.70  
23.80  
28.70  
1.60{  
2.60{  
LEGEND  
NOTES  
FLA --- Fu l l L oad Amps  
*
Permissible limits of the voltage range at which the unit will operate  
satisfactorily  
LRA --- L ocked Rotor Amps  
MCA --- Minimum Circuit Amps  
RLA --- Rated Load Amps  
{
}
One fan is 1.1 amps, the second fan is 0.5 amps.  
Two fans each operating at 1.3 amps.  
14  
A09597  
Fig. 20 -- 38HDR and 40QAC Cooling System Wiring Diagram  
15  
A09598  
Fig. 21 -- 38QRR and 40QAQ Heat Pump System Wiring Diagram  
16  
Complete Indoor Piping  
Connect Condensate Drain Line  
The piping to the indoor unit can be routed from the back, side and  
top. If the unit is being piped from the top or the side see note  
below.  
Observe all local sanitary codes when installing condensate drains.  
Refer to Fig. 23 for drain pipe connection from indoor unit.  
1. Use hard polyvinyl chloride (PVC) pipe material with nom-  
inal ID of 3/4 in. to connect at drain line. Use pipe insula-  
tion 1/4 in. thick, such as Armaflex insulation, on exposed  
piping inside the conditioned space.  
2. To insure regular flow of condensate water, the drain pipe  
should be pitched toward an open drain or sump at a down-  
ward slope of at least 1/4 in. per ft.  
3. If the drain piping is routed through the side of the unit, at-  
tach a field fabricated piece of sheet metal to support the  
drain pipe as shown in Fig. 23.  
1. On heat 40QAQ024 – 048, the cooling piston (indoor) is  
shipped in the factory installed metering device with the in-  
door unit. Use Table 6 to verify that you have the correct  
piston size for the system being installed.  
2. Run the line set and the control wiring from the outdoor to  
the indoor unit through the hole in the wall. Keep the piping  
general guidelines in mind.  
3. Cut the liquid and suction line to the correct length using a  
tube cutter.  
4. Remove the flare nuts from the indoor piping connections.  
Install them onto the liquid and suction lines and make flare  
connections.  
4. Attach drain pipe with nylon wire tie passing through hole  
as shown in Fig. 23.  
5. Apply a small amount of refrigerant oil to the flare connec-  
tion and tubing.  
6. Align the tubing with the refrigerant connections on the in-  
door unit.  
7. Tighten the flare nut and finish the installation using two  
wrenches as shown in Fig. 22.  
NOTE: When piping is being routed from the top or side, two  
pipe adaptors are supplied with the unit. Flare the pipe  
adaptors to the indoor unit connections and sweat the other  
ends to the line set.  
(Field Fabricated)  
A09534  
Fig. 23 -- Routing Drain Piping  
A07354  
Fig. 22 -- Tighten Flare Nut  
NOTE: Do not fasten nylon wire ties tight enough to deform the  
insulation, as this affects performance.  
8. Insulate both connections on the 38QRR and the liquid line  
connection on the 38HDR units.  
5. Install an external trap at the end of the condensate line.  
NOTE: Should the installation require one, a condensate pump  
may be ordered as a fields--installed accessory. It is easier to install  
pump before hanging the unit.  
17  
2. Route line power leads from inside disconnect to the fan  
coil. Place wire through the whole on the control box.  
3. Connect wire to high voltage terminal board (TB1) and  
ground screw.  
Complete Control Wiring  
1. Run the control wiring close to the terminal block on the  
indoor unit.  
2. Connect the wires as shown in Fig 18 and Fig. 20 for  
38HDR units, and Fig. 19 and Fig. 21 for 38QRR units.  
NOTE: When routing the wire in the unit, use care to keep the  
wire away from refrigerant and condensate piping and any  
sharp edges.  
Complete Power Connection To Indoor Unit  
Be sure field wiring complies with local building codes and NEC,  
and unit voltage is within limits shown in Table 12.  
Contact local power company for correction of improper line  
voltage.  
NOTE: The 208/230--v units are factory wired for 230--v to  
24--v transformer operation, For 208--v to 24--v operation,  
interchange the blue (208--v) and red (230--v) wires. Cap any  
unused wires with wire nuts.  
Install Thermostat  
These systems use a three speed thermostat. Refer to Table 9 for a  
list of recommended thermostats.  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
1. Mount thermostat to a wall in the occupied space using  
hardware provided with the thermostat. Locate the thermo-  
stat, preferably on an interior wall, in an area that is not sub-  
jected to drafts or direct sunlight through windows.  
2. Run the thermostat wires to the control box of the indoor  
unit. If running the thermostat through the back of the unit,  
3/8 in. space between the unit and the wall is required.  
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.  
3. Route wires over refrigerant and drain piping as shown in  
Fig. 24.  
!
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.  
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.  
*Field-supplied.  
A09533  
Fig. 24 -- Routing Wires Over Piping  
NOTE: Do not route wires under the piping, or wires could  
impede air filter removal.  
1. Route ground and power wires.  
4. Connect the thermostat wires to the indoor unit per Fig 25  
for a 40QAC unit and Fig. 26 for a 40QAQ unit.  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal injury  
or death.  
According to NEC and most local codes, the unit must have  
an uninterrupted, unbroken ground to minimize personal  
injury if an electric fault should occur. The ground may  
consist of electrical wire or metal conduit when installed in  
accordance with existing electrical codes.  
18  
HP ONLY  
COOLING ONLY  
Heating Only  
A09545  
Fig. 25 -- Thermostat Wire Connection for 40QAC  
Fig. 26 -- Thermostat Wire Connection for 40QAQ  
Reassemble Indoor Unit  
1. Reinstall filters and inlet grilles  
2. Reinstall the side panels  
Evacuate and Dehydrate the System  
!
CAUTION  
UNIT DAMAGE HAZARD  
START--UP  
Preliminary Checks  
Failure to follow this caution may result in equipment damage  
or improper operation.  
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 (see Fig. 27). Water must  
flow steadily; if not, check the pipe slope or inspect for any  
pipe restrictions.  
Never use the system compressor as a vacuum pump.  
Using Vacuum Pump  
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. 28.)  
2. Connect charge hose to vacuum pump.  
3. Fully open the low side of manifold gage. (See Fig. 29.)  
4. Start vacuum pump  
5. Evacuate using either deep vacuum or triple evacuation  
method.  
6. After evacuation is complete, fully close the low side of  
manifold gage and stop operation of vacuum pump.  
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.  
A09538  
Fig. 27 -- Inserting Water Into Drain Pan  
9. Fully open service valves B and A.  
2. Make sure all wiring connections are correct and they are  
tight.  
10. Securely tighten caps of service valves.  
3. Field electrical power source must agree with unit name  
plate rating.  
Indoor Unit  
C
Refrigerant  
Low Side  
Outdoor Unit  
A
B
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.  
D
High Side  
Service Valve  
Fig. 28 -- Service Valve  
5. All service valves must be closed.  
A07360  
6. On units with crankcase heaters, ensure belly--band heaters  
are tight around the compressor.  
19  
Triple Evacuation Method  
Manifold Gage  
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. 31 and proceed as follows:  
500 microns  
1. Pump system down to 28 in. of mercury and allow pump to  
continue operating for an additional 15 minutes.  
Low side valve  
High side valve  
Charge hose  
Charge hose  
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.  
Vacuum pump  
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. 31. System will  
then be free of any contaminants and water vapor.  
Low side valve  
Fig. 29 -- Manifold  
A07361  
EVACUATE  
BREAK VACUUM WITH DRY NITROGEN  
WAIT  
Deep Vacuum Method  
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. 30)  
EVACUATE  
BREAK VACUUM WITH DRY NITROGEN  
WAIT  
5000  
4500  
4000  
EVACUATE  
CHECK FOR TIGHT, DRY SYSTEM  
(IF IT HOLDS DEEP VACUUM)  
LEAK IN  
3500  
SYSTEM  
3000  
2500  
2000  
1500  
1000  
RELEASE CHARGE INTO SYSTEM  
A95425  
VACUUM TIGHT  
Fig. 31 -- Triple Evacuation Method  
TOO WET  
TIGHT  
To Start the Unit:  
500  
DRY SYSTEM  
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.  
0
1
2
3
4
5
6
7
MINUTES  
A95424  
Fig. 30 -- Deep Vacuum Graph  
3. Set the wireless remote control or wired remote control be-  
low ambient temperature. Operate the unit for 15 minutes.  
4. Refer to Table 5 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).  
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.  
20  
SAFETIES — The system is equipped with the following safety  
devices to protect system components: Indoor coil freeze  
protection thermostat — If a coil temperature of 28_F (--2.22_C) or  
lower is sensed, the compressor and outdoor fan will be shut down  
until the coil temperature exceeds 28_F (--2.22_C). The indoor fan  
will continue to run. Condensate float switch (units equipped with  
accessory condensate pump, cooling cycle only) — If the level of  
condensate in the drain pan rises too high, the condensate float  
switch will turn the system off.  
OPERATING SEQUENCE  
Ceiling--suspended fan coil units have a relay board which controls  
system operation in response to a room thermostat. The user may  
manually select any one of 3 fan speeds for unit operation. The  
discharge louvers on the unit can be stationary or swing  
continuously. A switch located at the bottom of the unit will turn  
the swing function on and off.  
Ceiling--suspended systems may be equipped with an accessory  
power ventilation kit and/or condensate pump.  
CLEANING AND MAINTENANCE  
FAN OPERATION  
Fan coils are capable of 3--speed  
operation. See thermostat instructions for fan speed selection.  
When the fan(s) is operating in medium or high speed and the unit  
is equipped with the power ventilation kit, the ventilation fan will  
operate to provide fresh air.  
!
WARNING  
ELECTRICAL SHOCK HAZARD  
COOLING MODE OPERATION — When the room thermostat  
senses a demand for cooling, the fan coil relay board is energized.  
The indoor fan(s) will start in the selected speed (if it is not already  
operating). The reversing valve (heat pump only) will energize for  
cooling operation.  
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.  
The internal condensate pump (if so equipped) runs whenever the  
reversing valve is energized (heat pump only) and/or the unit is in  
cooling. As long as the condensate float switch and freeze  
protection thermostat are closed, the cooling relays in the fan coil  
unit will close. This energizes the compressor and outdoor fan in  
the outdoor unit.  
!
CAUTION  
UNIT DAMAGE HAZARD  
The compressor will continue to operate until the room thermostat  
is satisfied. When the cooling demand is satisfied, the compressor  
and outdoor fan will stop. If the system is in the AUTO. position,  
the indoor fan will stop with the compressor.  
If the unit has the accessory ventilation kit, the ventilation fan will  
operate whenever the indoor fan is set for medium or high speed.  
Failure to follow this caution may result in equipment  
damage or improper operation.  
To avoid shrinkage, do not wash filter in water over  
120_F (48.9_C). To avoid damage, do not expose filter to  
fire or direct sunlight . Clean the filter more frequently  
when air is extremely dirty.  
HEAT PUMP OPERATION — When the room thermostat  
senses a demand for heating the indoor fan will start in the selected  
speed (if not already operating), and the reversing valve will not be  
energized.  
For proper system operation, perform the cleaning and  
maintenance operations in Table 13.  
Lubrication — The indoor--fan, automatic air sweep, and the  
outdoor--fan motors are factory lubricated and require no oiling.  
The internal condensate pump (if supplied) and freeze protection  
thermostat are not operated during heating operation. The control  
relay (CR2) closes, and the compressor and outdoor fan are  
energized through the defrost board (DFB), which is located in the  
outdoor unit. The microprocessor logic in the DFB is energized  
when the compressor starts, and the defrost timer runs. Once every  
90 minutes (factory default setting) of compressor run time, the  
DFB logic checks the defrost thermostat (DFT). If the DFT is  
open, the unit continues in heating operation. If the DFT is closed,  
the DFB switches the unit to defrost mode. The timing on the DFB  
may be set at either 30, 50, or 90 minutes.  
DEFROST (Heat Pump Only) — The DFB energizes the RVS  
(reversing valve solenoid), and the reversing valve switches to the  
cooling position. The K1 relay on the DFB opens and the outdoor  
fan stops. The W2 contact on the DFB is also energized, which in  
turn energizes the defrost relay on the fan coil relay board, turns off  
the electric heater and stops the indoor fan.  
AIR FILTERS  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage or improper operation.  
Operating the system with dirty air filters may damage the  
indoor unit and can cause reduced cooling performance,  
intermittent system operation, frost build--up on the indoor  
coil, and blown fuses. Inspect and clean or replace the air  
filters monthly.  
REMOVE AIR FILTERS — Remove filters by pulling them  
straight out.  
The DFB logic checks the 10--minute defrost timer and the DFT. If  
the DFT opens in less than 10 minutes, the DFB switches the unit  
back to normal heating operation. If the DFT remains closed, the  
DFB switches the unit back to heating operation after 10 minutes.  
When the DFB changes back to heating mode, the RVR (reversing  
valve relay) is de--energized and the reversing valve switches back  
to heating operation. Both the outdoor and indoor fans come back  
on, and if necessary, the electric heater also turns on. SYSTEM  
CLEAN OR REPLACE FILTERS — Filters can be vacuumed  
or washed in warm water. Shake filter to remove any excess water,  
and replace by sliding filter behind grille until filter snaps in place.  
Refer to Fig. 32. If the filter has begun to break down or is torn,  
replace it. Replacement filters are available through your dealer.  
21  
Table 13 – Cleaning and Maintenance Schedule  
TASK  
MONTHLY  
QUARTERLY  
YEARLY  
INDOOR UNIT  
Clean Air Filters  
Clean Drain Pipe  
X
X
Clean Condensate Drain Pan  
Clean Indoor Coil  
X
X
Clean Indoor Unit Front Panel  
OUTDOOR UNIT  
X
X
Clean the Fins From Outside  
Open the Unit and Clean Fins Inside  
Remove Dust From Electrical Parts  
Check Electrical Connections are Tight  
Clean Outdoor Fan  
X
X
X
X
X
X
Clean Outdoor Coil  
Check that Outdoor Fan Assembly is Tight  
Clean Drain Pan  
X
NOTE: Maintenance procedures for the outdoor units are in the individual unit installation instructions.  
CLEAN INDOOR UNIT BOTTOM PANEL — If the bottom  
panel of the unit becomes dirty or smudged, wipe the outside of the  
panel with a soft dry cloth. Use a mild liquid detergent and wipe  
SERVICE  
!
WARNING  
off carefully with a dry cloth.  
CLEAN INDOOR COIL — To clean the coil, remove indoor  
unit bottom panel and vacuum the coil fins, using care not to bend  
or damage fins.  
ELECTRICAL SHOCK HAZARD  
Failure to follow this warning could result in personal injury  
or death.  
CLEAN OUTDOOR COIL (Outdoor Unit)  
Before 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  
CUT HAZARD  
Failure to follow this caution may result in personal injury.  
!
CAUTION  
Sheet metal parts may have sharp edges or burrs. Use care and  
wear appropriate protective clothing and gloves when  
cleaning. Clean coil carefully.  
ENVIRONMENTAL HAZARD  
Failure to follow this caution may result in environmental  
damage.  
Federal regulations require that you do not vent refrigerant to  
the atmosphere. Recover during system repair or final unit  
disposal.  
To clean the outdoor coil:  
1. Remove any dirt or obstruction from discharge opening.  
2. Use a garden hose to spray water on the coil. Debris that  
collects between coil fins inhibits heat transfer — direct the  
water spray between coil fins to flush out debris.  
CLEAN CONDENSATE DRAINS — Clean all drains and drain  
pans at the start of each cooling season. Check the flow by pouring  
water into the drain.  
To clean or replace drain pan:  
1. Place a plastic sheet on the floor to catch any water that may  
spill from drain pan.  
2. Remove the intake grille and distribution assembly (at-  
tached).  
3. Remove the condensate water in the drain pan by letting  
water drain into a 3--gallon bucket.  
!
CAUTION  
UNIT DAMAGE HAZARD  
Failure to follow this caution may result in equipment  
damage.  
A09539  
Fig. 32 -- Cleaning Filters  
Do not use a screwdriver to pry drain pan out of assembly  
-- it could damage the pan.  
4. Remove the 4 screws holding the drain pan.  
5. Carefully hold the drain pan to remove it from the assembly.  
22  
IF SYSTEM FAILS TO OPERATE — Be sure:  
Before Calling for Service  
S
S
unit ON/OFF switch is in ON position  
fuse or circuit breaker is not tripped  
Save the cost of a service call by doing the following:  
1. Be sure main power to system is turned on.  
2. Press Mode button until OFF is displayed. Wait 5 minutes.  
FRESH AIR INSTALLATION OPTION  
3. Press Mode button until either COOL or HEAT is displayed  
(as desired).  
The units have an installation option, which allows for field  
installation of fresh air ventilation. Plan the installation carefully.  
Before beginning, measure carefully and follow acceptable  
building practices, NEC, and local codes.  
Ventilation--Air Accessory — Refer to ventilation air accessory  
installation instructions.  
4. Adjust thermostat set point to desired room temperature. If  
system starts within a few minutes, service may not be ne-  
cessary. If system does not operate properly, check Table 14  
for typical solutions.  
TROUBLESHOOTING  
If the under--ceiling fan coil unit fails to start or operate properly, sometimes the problem is minor and can be handled without a service call.  
Refer to Table 14 for some common problems, causes, and typical solutions. See Fig. 36 and 37 for additional system troubleshooting details.  
If the problem cannot be corrected, contact a local dealer for further assistance.  
Table 14 – Troubleshooting  
PROBLEM  
CAUSE  
TYPICAL SOLUTION  
Blown fuse or circuit breaker tripped at building power  
entry.  
Replace fuse or reset circuit breaker.*  
Indoor and/or outdoor unit disconnect switch is off.  
Thermostat is set to night mode.  
Power failure.  
Turn on disconnect switch(es).  
Cancel mode using Day/Night button on thermostat.  
Restore power.  
System Does Not Start.  
Press Mode button on thermostat until thermostat dis-  
plays the desired unit mode.  
Unit is in off mode.  
Three---minute time delay is running.  
Wait for 3 minutes.  
Temperature is above or below the selected temperat-  
ure.  
Select new temperature using the thermostat.  
Clean or replace air filter(s).  
Air filter(s) in indoor unit is dirty or needs to be replaced.  
Temperature is set too high or too low.  
Outdoor unit outdoor coil restricted.  
Fan speed is set too low.  
Reset temperature to desired comfort setting using the  
thermostat.  
System Does Not Cool Properly.  
System Does not Heat Properly.  
Remove obstruction.  
Adjust fan speed to high or auto. using the Fan button  
on the thermostat.  
Air filter(s) in indoor unit is dirty or needs to be replaced.  
Temperature is set too high or too low.  
Outdoor unit outdoor coil restricted.  
Fan speed is set too low.  
Clean or replace air filter(s).  
Reset temperature to desired comfort setting using the  
thermostat.  
Remove obstruction.  
Adjust fan speed to high or auto. using the Fan button  
on the thermostat.  
Check manual defrost timer setting and adjust as ne-  
cessary.  
Outdoor unit outdoor coil is frosted up.  
Low outdoor---air temperature.  
Run system in fan---only mode until frost is gone.  
Clean or replace air filter(s).  
Ice or frost has Formed on Indoor  
Coil.{  
Air filter(s) in indoor unit is dirty or needs to be replaced.  
Air filter(s) in indoor unit is dirty or needs to be replaced.  
Fan coil unit coil is blocked.  
Clean or replace air filter(s).  
Insufficient Airflow.  
Clean air discharge louvers.  
*
If fuse blows or circuit breaker trips again after first start attempt, DO NOT attempt to start system again. Contact your local dealer for assistance.  
When outdoor temperature is approximately 55_F (12.8_C) or below, indoor coil frosting may occur when system is operated in cooling or maximum  
dehumidification mode. Units are not intended to operate below 55_F (12.8_C) without appropriate accessories.  
23  
LEGEND  
NC  
Normally Closed  
ODT — Outdoor Thermostat  
NOTE: For systems with indoor units equipped with microprocessor  
control, see separate controls, service, and troubleshooting manual.  
A07435  
Fig. 33 -- Troubleshooting the Heating Cycle  
24  
LEGEND  
NC  
Normally Closed  
ODT — Outdoor Thermostat  
NOTE: For systems with indoor units equipped with microprocessor  
control, see separate controls, service, and troubleshooting manual.  
A07436  
Fig. 34 -- Troubleshooting the Cooling Cycle  
25  
C a t a l o g N o : 4 0 Q A C --- Q --- 2 S I  
Copyright 2009 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231  
Printed in U.S.A.  
Edition Date: 10/09  
R e p l a ce s: 4 0 QA C --- Q --- 1 SI  
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.  
26  

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