Carrier Air Conditioner 40QA024 060 User Manual

40QA024-060  
Ceiling-Suspended Fan Coil Units  
Installation, Start-Up and Service Instructions  
CONTENTS  
SAFETY CONSIDERATIONS  
Page  
Installing and servicing air-conditioning equipment can be  
hazardous due to system pressure and electrical components.  
Only trained and qualified service personnel should install or  
service air-conditioning equipment.  
Untrained personnel can perform basic maintenance, such  
as cleaning and replacing filters. All other operations should be  
performed by trained service personnel. When working on air-  
conditioning equipment, observe precautions in literature and  
on tags and labels attached to unit.  
Follow all safety codes. Wear safety glasses and work  
gloves. Use quenching cloth for brazing operations. Have fire  
extinguisher available. Read these instructions thoroughly.  
Consult local building codes and National Electrical Code  
(NEC) for special installation requirements.  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . .1  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17  
Step 1 — Complete Pre-Installation  
Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
• UNPACK UNIT  
• INSPECT SHIPMENT  
• BEFORE INSTALLATION  
Step 2 — Select Location. . . . . . . . . . . . . . . . . . . . . . . . . . . .4  
Step 3 — Mount Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6  
• WOODEN STRUCTURE  
• NEWLY BUILT CONCRETE SLAB  
• METAL STRUCTURE  
• PREVIOUSLY BUILT CONCRETE SLAB  
• TO MOUNT UNIT  
• TO INSTALL THERMOSTAT  
Step 4 — Connect Refrigerant Piping. . . . . . . . . . . . . . . .7  
Step 5 — Connect Condensate Drain Line . . . . . . . . . . .8  
Step 6 — Make Electrical Connections . . . . . . . . . . . . .10  
Step 7 — Install Thermostat . . . . . . . . . . . . . . . . . . . . . . . .12  
Step 8 — Make Connections Between  
Before installing or servicing system, always turn off  
main power to system. There may be more than one dis-  
connect switch. Turn off accessory heater power if appli-  
cable. Electrical shock can cause personal injury.  
Indoor and Outdoor Units . . . . . . . . . . . . . . . . . . . . . . . .15  
• CHECK ACCURATOR METERING DEVICE  
• COOLING ONLY SYSTEMS  
• HEAT PUMP SYSTEMS  
INSTALLATION  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18,19  
After Extended Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . .18  
Seasonal Changeovers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18  
Adjusting Airflow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18  
Operating Mode Memory . . . . . . . . . . . . . . . . . . . . . . . . . . .18  
Automatic Operation (Auto.) Mode. . . . . . . . . . . . . . . . . .18  
Operating Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18  
• FAN OPERATION  
Installation instructions for fan coil units (Fig. 1) are con-  
tained in this manual. Refer to this manual for proper installa-  
tion of the complete system. Note that the outdoor units are  
shipped with installation and service instructions for basic in-  
stallation of the outdoor section. Be sure to make the connec-  
tions in Cooling Only Systems and Heat Pump Systems sec-  
tions on page 15 of this literature so that the unit will operate  
properly.  
• COOLING MODE OPERATION  
• HEAT PUMP OPERATION  
Refer to Table 1 for proper system matches.  
• DEFROST (Heat Pump Only)  
• SYSTEM SAFETIES  
• SPECIAL OPERATION, HEATING  
CLEANING AND MAINTENANCE . . . . . . . . . . . . . . . . 19,20  
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19  
Air Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19  
• REMOVE AIR FILTERS  
• CLEAN OR REPLACE FILTERS  
Clean Indoor Unit Bottom Panel . . . . . . . . . . . . . . . . . . . .20  
Clean Indoor Coil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20  
Clean Outdoor Coil (Outdoor Unit). . . . . . . . . . . . . . . . . .20  
Clean Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . . .20  
• CLEAN OR REPLACE DRAIN PAN  
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20  
Before Calling for Service . . . . . . . . . . . . . . . . . . . . . . . . . .20  
• IF SYSTEM FAILS TO OPERATE  
FRESH AIR INSTALLATION OPTION . . . . . . . . . . . . . . . .20  
Ventilation-Air Accessory . . . . . . . . . . . . . . . . . . . . . . . . . .20  
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20  
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . .CL1, CL-2  
Fig. 1 — Ceiling-Suspended Fan Coil Unit  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Catalog No. 02-40QA0007-SI Printed in U.S.A. Form 40QA-7SI Pg 1 706 3-06 Replaces: 40QA-5SI  
Book 1  
4
Tab 3d 2c  
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Table 3A — Physical Data, Under Ceiling Cooling Only Units  
SYSTEM SIZE  
018*  
11/2  
18,000  
108  
024  
2
24,000  
108  
030  
3
30,000  
117  
036  
3
36,000  
117  
048  
4
48,000  
149  
060  
5
60,000  
179  
NOMINAL CAPACITY (tons)  
NOMINAL SIZE (Btuh)  
OPERATING WEIGHT (lb)  
MOISTURE REMOVAL WEIGHT  
(Pints/Hr)  
4.0  
7.3  
6.0  
9.0  
13.0  
14.5  
FINISH  
GM Motorhome White with Black Trim  
REFRIGERANT  
Control (Cooling)  
R-410A  
AccuRater Control  
INDOOR FAN  
Direct Drive Centrifugal  
Rpm...Cfm High  
862...500  
690...400  
552...320  
92  
1050…600  
690...400  
552...320  
92  
1275...840  
972...740  
830...640  
282  
1275...840  
972...740  
830...640  
282  
1435...1200  
1388...1160  
1315...1100  
425  
1275...1600  
972...1220  
830...1040  
564  
Rpm...Cfm Medium  
Rpm...Cfm Low  
High Speed Watts  
Motor Quantity  
1
1
1
1
2
2
Blowers — No. ...Size (in.)  
2...6x8  
2…6x8  
2…6x8  
2…6x8  
3…6x8  
4…6x8  
INDOOR COIL  
Face Area (sq ft)  
No. of Rows  
Fins/in.  
Copper Tube, Aluminum Fin  
2.2  
4
14.9  
4
2.2  
4
14.9  
4
2.6  
4
2.6  
4
3.0  
4
14.9  
8
4.0  
4
14.9  
8
14.9  
4
14.9  
4
Circuits  
FILTERS  
Quantity  
Cleanable  
4
4
5
5
6
8
AIRSWEEP  
Horizontal  
Vertical  
User select ON/OFF  
Manual  
CONTROLS  
Control Voltage  
24 V  
Yes  
Auto Restart  
Fan Speed  
Condensate Pump Safety  
Indoor Coil Freeze Protection  
Filter Change Indication  
High/Medium/Low  
Yes (Accessory)  
Standard shutoff at 28 F  
250 Hours of Indoor Fan Operation  
REFRIGERANT LINES  
Connection Type  
Liquid Line OD (in.)  
Vapor Line OD (in.)  
Max Line Length  
Flare  
3
/
8
7/8†  
5
5
3
3
7
/
/
/
/
/
For8maximum line lengths see condensing unit instructions.  
8
4
4
8
CONDENSATE DRAIN  
CONNECTION  
CONDENSATE DRAIN SIZE (in.)  
Pipe Thread (MPT)  
3
/
4
*Field reconfigured to 18,000 Btuh (11/2 tons). See Before Installa-  
tion section on this page for details.  
† The valve connection size is 7/8 inch. The recommended line size  
is 11/8 inch.  
Step 1 — Complete Pre-Installation Checks  
UNPACK UNIT — Store fan coil unit in the original packag-  
ing until it is moved to the final site for installation. When re-  
moving unit from carton, lift unit by its 4 corners; DO NOT lift  
unit by its plastic parts.  
INSPECT SHIPMENT — Upon receipt of shipment, check  
fan coil unit for damage. Forward claim papers directly to the  
transportation company. Manufacturer is not responsible for  
damage incurred in transit.  
Check all items; if any item is missing, notify your dealer.  
To prevent loss or damage, leave all parts in original packages  
until installation.  
BEFORE INSTALLATION — Perform the following steps  
before installing indoor fan coil unit. Place the indoor unit up-  
side down on the floor, then:  
1. Remove side panels by sliding forward, then away  
NOTE: Dimensions shown in brackets [ ] are in mm.  
from sides of unit (Fig. 2). Reinstall prior to unit start-  
up.  
Fig. 2 — Removal of Mounting Brackets  
from Indoor Unit  
2. Remove air filters from inlet grilles; then remove and  
retain screws securing inlet grilles to indoor unit. Rein-  
stall prior to unit start-up.  
3
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Table 3B — Physical Data, Under Ceiling Heat Pump Units  
UNIT SIZE  
018*  
11/2  
18,000  
110  
024  
2
24,000  
110  
030  
3
30,000  
119  
036  
3
36,000  
119  
048  
4
48,000  
151  
060  
5
60,000  
181  
NOMINAL CAPACITY (tons)  
NOMINAL SIZE (Btuh)  
OPERATING WEIGHT (lb)  
MOISTURE REMOVAL WEIGHT  
(Pints/Hr)  
4.0  
7.3  
6.0  
9.0  
13.0  
14.5  
FINISH  
GM Motorhome White with Black Trim  
REFRIGERANT  
Control (Cooling)  
R-410A  
AccuRater Control  
TXV  
INDOOR FAN  
Direct Drive Centrifugal  
Rpm...Cfm High  
900…480  
862...400  
770...320  
92  
1050…550  
900…480  
862...400  
92  
1275...840  
972...740  
830...640  
282  
1275...840  
972...740  
830...640  
282  
1435...1130  
1388... 975  
1315... 820  
425  
1275...1600  
972...1220  
830...1040  
564  
Rpm...Cfm Medium  
Rpm...Cfm Low  
High Speed Watts  
Motor Quantity  
1
1
1
1
2
2
Blowers — No. ...Size (in.)  
2...6x8  
2...6x8  
2...6x8  
2...6x8  
3...6x8  
4...6x8  
INDOOR COIL  
Face Area (sq ft)  
No. of Rows  
Fins/in.  
Copper Tube, Aluminum Fin  
2.2  
4
14.9  
4
2.2  
4
14.9  
4
2.6  
4
2.6  
4
3.0  
4
14.9  
8
4.0  
4
14.9  
8
14.9  
4
14.9  
4
Circuits  
FILTERS  
Quantity  
Cleanable  
4
4
5
5
6
8
HEATERS (kW)  
2.0  
2.0  
3.0  
3.0  
4.0  
5.0  
AIRSWEEP  
Horizontal  
Vertical  
User select ON/OFF  
Manual  
CONTROLS  
Control Voltage  
Defrost Method  
Dehumidification  
Auto Restart  
24 V  
Timed  
Yes  
Yes  
Fan Speed  
High/Medium/Low  
Condensate Pump Safety  
Filter Change Indication  
Freeze Protection  
Yes (Accessory)  
250 Hours of Indoor Fan Operation  
Indoor coil less than 28 F, resets at 50 F.  
REFRIGERANT LINES  
Connection Type  
Liquid Line OD (in.)  
Vapor Line OD (in.)  
Max Line Length  
Flare  
3
/
8
7/8†  
5
5
3
3
7
/
/
/
/
/
For8maximum line lengths see condensing unit instructions.  
8
4
4
8
CONDENSATE DRAIN  
CONNECTION  
CONDENSATE DRAIN SIZE (in.)  
Pipe Thread (MPT)  
3
/
4
*Field reconfigured to 18,000 Btuh (11/2 tons). See Before Installa-  
tion section on page 3 for details.  
†The valve connection size is 7/8 inch. The recommended line size  
is 11/8 inch.  
3. Remove inlet grilles from indoor unit by sliding for-  
ward. Reinstall prior to unit start-up.  
construction. Plan the installation carefully before you begin.  
Listed below are some guidelines that should be followed  
when determining location for the unit.  
IMPORTANT: If necessary, reconfigure the 24,000 Btuh  
fan coil unit to 18,000 Btuh. Unplug the fan motor at the  
control box harness and plug into the 40QA018 marked  
connector.  
1. Place unit adjacent to an outside wall if fresh air is  
required, ensuring that location allows for complete air  
distribution.  
2. Locate the thermostat in an area that is not subjected to  
drafts or direct sunlight through windows. Locate the  
thermostat on an internal wall whenever possible.  
3. Allow sufficient clearance for airflow, wiring, refriger-  
ant piping, and servicing unit (Fig. 3 and 4).  
4. Make sure the unit is easily accessible to electrical  
power.  
Step 2 — Select Location — Consult local building  
codes and NEC for special installation requirements. See Fig. 3  
and 4 for unit dimensions and required clearances.  
There are several ways the unit may be installed to different  
types of ceiling construction. These instructions do not cover  
all installation methods. As a typical installation, these instruc-  
tions focus primarily on mounting the unit to metal in new  
4
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NOTES:  
1. Dimensions in [ ] are in millimeters.  
2. Direction of airflow.  
3. Standard unit clearances are as follows:  
• 0on top and rear  
• 3on left side  
• 12on right side  
• 36on bottom  
(When facing unit discharge.)  
WEIGHT (lb)  
Cooling Only Heat Pump  
A
B
E
F
G
UNIT  
SIZE  
ft-in.  
4- 215/16 1294 3-10  
4-1013/16 1493 4- 57/8 1368 4- 91/2 1459  
5-119/16 1817 5- 65/8 1692 5-101/4 1783 1- 97/8 555 3- 31/16 992  
7- 8 2336 7- 3  
2211 7- 65/8 2302 1-115/8 601 4-119/16 1512  
mm ft-in. mm ft-in. mm ft-in. mm ft-in.  
mm  
024  
036  
048  
060  
108  
117  
149  
179  
110  
119  
151  
181  
1169 4- 15/8 1260  
1- 95/8 549  
2- 11/2 648  
Fig. 3 — Base Unit Dimensions  
5
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Fig. 4 — Fan Coil Unit Clearances  
5. Run refrigerant piping as directly as possible and avoid  
any unnecessary turns or bends.  
6. Condensate piping can be directed through the inside  
wall to an approved drain or straight outside.  
NOTE: The piping hole for condensate line must slope at a  
minimum pitch of 1/4 in. per foot to ensure proper drainage. If  
proper pitch cannot be achieved, install accessory condensate  
pump at this time.  
Step 3 — Mount Unit — Refer to Fig. 4 for clearances  
and dimensions. Use mounting template included inside box to  
locate mounting bolt holes, piping holes, electrical connec-  
tions, and accessory outdoor-air intake, if used.  
Select proper type of hardware from the guidelines below.  
See Fig. 5.  
Fig. 5 — Fan Coil Unit Mounting Methods  
(Hardware is Field-Supplied)  
Solid structure in ceiling must be used due to the weight of  
the unit.  
2. Determine installation position, paying particular  
attention to piping lengths, wiring connections, clear-  
ances, etc. See Fig. 3 for connection locations, Fig. 4  
for clearances, and Fig. 7 and 8 for bolt locations.  
WOODEN STRUCTURE — Install hanging bolts on a  
square wooden piece placed over beams.  
3. Open knockout if right-side piping connections are  
required (Fig. 9), by removing the pre-slit portion in  
the rear of the right side panel with a saw or cutter  
knife.  
4. Mount hanging brackets on ceiling (Fig. 10) for either  
concealed or exposed bolt hanging position.  
5. Lift the unit into place, and fit the hex-head bolts on  
sides of indoor unit into mounting slots of mounting  
brackets (Fig. 11). Ensure unit is mounted with a slight  
tilt to the right rear side for properly drainage.  
NEWLY BUILT CONCRETE SLAB — Install hanging bolts  
with inserts, embedded bolts, etc.  
METAL STRUCTURE — Install hanging bolts utilizing an  
existing angle or by installing a new support angle.  
PREVIOUSLY BUILT CONCRETE SLAB — Install hang-  
ing bolts with expansion anchor.  
TO MOUNT UNIT:  
1. Remove mounting bracket and reinstall the 2 hex-head  
bolts (factory-supplied) into each side of indoor unit as  
3
shown in Fig. 6. Allow approximately /8-in. space  
6. Tighten indoor unit hex-head bolts securely.  
between bolt head and unit.  
6
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TO INSTALL THERMOSTAT:  
3
If there is at least /8 in. of space between the back of indoor  
unit and wall:  
1. Route thermostat wires (field-supplied) through slot in  
right side or rear panel of indoor unit (Fig. 3).  
2. Route wires over refrigerant and drain piping as shown  
in Fig. 12.  
IMPORTANT: Do not route wires under the piping, or  
wires could impede air filter removal.  
Fig. 6 — Installing Hex-Head Mounting Bolts  
in Fan Coil Unit  
Step 4 — Connect Refrigerant Piping — Fan coil  
units may be connected to outdoor units using field-supplied  
refrigerant grade piping. Refer to Tables 3A and 3B for the cor-  
rect size piping. The length of refrigerant pipe depends on the  
unit placement and building structure; run pipes as directly as  
possible. For piping requirements over 50 ft of total run, or  
more than 25 ft of lift, consult the Residential Long Line Appli-  
cation Guide.  
DO NOT BURY MORE THAN 36 IN. OF REFRIGER-  
ANT PIPE IN THE GROUND. If any section of pipe is  
buried, there must be a 6-in. vertical rise to the valve con-  
nections on the outdoor unit. If more than the recommended  
length is buried, refrigerant may migrate to the cooler, bur-  
ied section during extended periods of unit shutdown, caus-  
ing refrigerant slugging and possible compressor damage at  
start-up.  
DIMENSIONS (in.)  
UNIT SIZE  
A
B
C
024  
036  
048  
060  
5015/16  
5813/16  
719/16  
92  
46  
495/8  
571/2  
701/4  
905/8  
537/8  
665/8  
87  
Fig. 7 — Fan Coil Unit Hanging Dimensions  
To connect piping:  
1. Install insulation. It is extremely important that all  
refrigerant lines and the metering device be insulated  
on heat pumps and multi-splits. On cooling only units,  
the liquid line may be left uninsulated. Use any accept-  
able heat resistant closed-cell foam insulation (mini-  
3
mum /8-in. wall thickness). When insulating piping,  
cap ends and slide insulation over the piping. Insula-  
tion can also be cut and placed over piping.  
2. Run liquid and gas refrigerant piping.  
a. Run pipes as directly as possible, and avoid any  
unnecessary turns and bends.  
b. Suspend refrigerant pipes so that the insulation is  
not damaged and vibrations are not transmitted to  
the structure.  
c. Leave slack in the refrigerant pipe between the  
structure and the unit to absorb vibrations.  
d. A piston is shipped in the factory-installed meter-  
ing device body (Fig. 13) with the indoor unit. Use  
Tables 4A-4C to verify that you have the required  
piston size for the system being installed.  
DIMENSIONS (in.)  
UNIT SIZE  
B
C
024  
036  
048  
060  
46  
495/8  
571/2  
701/4  
905/8  
537/8  
665/8  
87  
*Exposed mounting holes.  
IMPORTANT: The metering device is factory-  
installed and only needs to be replaced for long line  
applications or if the system combination requires it.  
See Tables 4A-4C. See Fig. 13.  
†Reverse bracket holes (concealed mounting).  
Fig. 8 — Mounting Included with  
Fan Coil Unit  
e. For special applications such as long lines or raised  
elevations, consult the Residential Long Line  
Application Guide for specific system require-  
ments. The arrow on the metering device body  
must face away from the indoor coil.  
Fig. 9 — Removing Rear Knockout in Side Panel  
if Right-Side Piping Connection is Used  
7
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f. Refer to the outdoor unit Installation, Start-Up and  
Service Instructions for additional information.  
g. Install a factory-supplied filter drier near the out-  
door unit. On heat pump systems, a bi-flow filter  
drier must be used.  
2. To ensure regular flow of condensate water, the drain  
pipe should be pitched toward an open drain or sump  
at a downward slope of at least 1/4-in. per ft.  
3. Attach plate with screws under piping hole.  
4. Attach drain pipe with nylon wire tie passing through  
hole (Fig. 15).  
NOTE: Do not fasten nylon wire ties tight enough to  
deform the insulation, as this affects its performance.  
5. Insulate condensate drain line(s) that are located in or  
above an occupied area with a condensate-proof mate-  
rial such as polyurethane or neoprene.  
3. Insulate and caulk wall openings to reduce air infiltra-  
tion and refrigerant pipe vibrations on structure.  
4. Evacuate piping, if necessary. If either refrigerant pip-  
ing or the indoor coil is exposed to atmospheric condi-  
tions, it must be evacuated to 1000 microns to  
eliminate contamination and moisture in the system.  
Step 5 — Connect Condensate Drain Line —  
Observe all local sanitary codes when installing condensate  
drains. Refer to Fig. 3 and 14 for drain pipe connection from  
indoor unit.  
1. Use hard polyvinyl chloride (PVC) pipe material with  
nominal ID of 3/4 in. to connect at drain line. Use pipe  
insulation 1/4-in. thick, such as Armaflex insulation, on  
exposed piping inside the conditioned space.  
6. Install an external trap at the end of the condensate  
line.  
NOTE: Should the installation require one, a conden-  
sate pump may be ordered as a field-installed  
accessory.  
Table 4A — Piston and Charge Combinations — Cooling Only Systems  
COOLING  
INDOOR UNIT SIZE  
OUTDOOR UNIT  
38HDR  
PISTON  
CHARGE (lb)  
SIZE  
018  
024  
030  
036  
048  
060  
57  
57  
65  
70  
80  
90  
7.0  
7.75  
10.1  
8.9  
12.2  
12.5  
024  
036  
048  
060  
Table 4B — Piston and Charge Combinations — Heat Pump Systems  
HEAT PUMP  
INDOOR UNIT SIZE  
OUTDOOR UNIT  
38QRR  
PISTON SIZE  
INDOOR  
PISTON SIZE  
OUTDOOR  
CHARGE (lb)  
018  
024  
030  
036  
048  
060  
49  
55  
65  
70  
82  
—*  
40  
43  
55  
63  
73  
80  
7.5  
7.8  
12  
13  
12.2  
12.8  
024  
036  
048  
060  
*Size 060 indoor heat pump systems use a TXV (thermostatic expansion valve), part no. EA36YD250.  
Table 4C — Piston and Charge Combinations — Heat and Cool Systems  
HEAT PUMP  
INDOOR UNIT SIZE  
OUTDOOR UNIT  
38HDR  
PISTON  
SIZE  
CHARGE (lb)  
018  
024  
030  
036  
048  
060  
57  
57  
65  
70  
80  
—*  
7.0  
7.75  
10.1  
8.9  
12.2  
12.5  
024  
036  
048  
060  
*Size 060 indoor heat pump systems use a TXV (thermostatic expansion valve), part no. EA36YD250.  
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Fig. 10 — Mounting Hanging Brackets  
NOTE: Teflon Seal must face toward the outdoor heat pump unit.  
Fig. 13 — AccuRater Metering Device at Service  
Valve (Bypass Type Components),  
Heat Pump Systems Only  
Fig. 11 — Hanging Fan Coil Unit  
*Field-supplied.  
Fig. 12 — Routing Wires Over Piping  
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outdoor unit if disconnect can be locked; check local code  
before installing in this manner.  
1. Route ground and power wires.  
Step 6 — Make Electrical Connections — Be sure  
field wiring complies with local building codes and NEC, and  
unit voltage is within limits shown in Table 5.  
Contact local power company for correction of improper  
line voltage.  
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. Failure to follow  
this warning could result in an electric shock, fire, or death.  
To avoid personal injury or damage to unit, do not make  
electrical connections until all power sources are shut  
down, locked out, and tagged off. Failure to do so could  
result in personal injury or unit damage.  
2. Route line power leads (see Fig. 16) from indoor dis-  
connect to the fan coil unit. Place wire through hole on  
the control box (Fig. 17). Connect wire to high voltage  
terminal board (TB1) and ground screw. When routing  
the wire in the unit, use care to keep the wire away  
from refrigerant and condensate piping and any sharp  
edges. The 208/230-v units are factory wired for  
230-v to 24-v transformer operation. For 208-v to  
24-v operation, interchange blue (208-v) and red  
(230-v) wires. Cap any unused wires with wire nuts.  
Operation of unit on improper line voltage constitutes abuse  
and could affect warranty. Refer to Table 5 for permissible  
operating limits. Do not install unit in system where voltage  
may fluctuate above or below permissible limits.  
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  
Table 5 — Electrical Data*  
FAN  
HEATER  
POWER  
MOCP  
15  
SYSTEM  
TYPE  
UNIT  
SIZE  
MIN WIRE SIZE  
(AWG)  
Motor 1 FLA  
Motor 2 FLA  
kW  
FLA  
MCA  
0.53  
1.60  
2.00  
3.30  
FLA  
0.50  
1.30  
1.60  
2.60  
024†  
036  
048  
060  
024†  
036  
048  
060  
0.5  
1.3  
1.1  
1.3  
0.5  
1.3  
1.0  
1.3  
0.5  
1.3  
0.5  
1.3  
14  
14  
14  
14  
14  
14  
12  
10  
15  
15  
15  
15  
20  
25  
30  
COOLING  
ONLY  
2.00  
3.00  
4.00  
5.00  
8.66  
13.00  
17.40  
21.70  
9.29  
9.16  
17.70  
23.80  
28.70  
14.30  
19.00  
24.30  
HEAT PUMP  
LEGEND  
AWG — American Wire Gage  
FLA — Full Load Amps  
MCA — Minimum Circuit Amps per NEC Section 430-24  
MOCP — Maximum Overcurrent Protection  
NEC — National Electrical Code  
*All units are 208/230-1-60. Minimum operating voltage is 187, max-  
imum is 253. Units will operate satisfactorily within this voltage  
range.  
†Electrical data is the same for both the 24,000 Btuh 024 unit and  
the 024 unit that has been field-reconfigured for 18,000 Btuh. Refer  
to Before Installation section on page 3 for reconfiguration details.  
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LEGEND  
NOTES:  
1. All piping must follow standard refrigerant piping techniques.  
2. All wiring must comply with the applicable local and national codes.  
3. Liquid line need not be insulated (cooling only units).  
4. Wiring and piping shown are general points-of-connection guides  
only and are not intended for a specific installation.  
5. Insulate condensate line if run above a conditioned space.  
7. Metering device is provided.  
φ
Phase  
NEC — National Electrical Code  
Piping  
Line Voltage  
24 V  
Thermistor  
*Standard.  
†Accessory item.  
**Field supplied.  
††Insulate for heat pump application.  
Fig. 14 — Component Location (Typical Ceiling-Suspended System)  
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Step 7 — Install Thermostat — These systems use a  
3-speed thermostat. The thermostat monitors the system opera-  
tion and controls the operating mode. To change settings or re-  
fer to the thermostat Operating Instructions.  
Mount thermostat to a wall in the occupied space using  
2 field-supplied screws. Locate the thermostat in an area that is  
not subjected to drafts or direct sunlight through windows.  
Locate thermostat on an interior wall whenever possible.  
Figure 18 shows available thermostats.  
LEGEND  
TB — Terminal Block  
Fig. 16 — Line Power Connections  
Fig. 15 — Routing Drain Piping  
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2 sn  
LEGEND  
ASM  
ASR  
Air Sweep Motor  
Air Sweep Relay  
NEC  
PL  
National Electrical Code  
Plug  
Terminal Block  
EQUIP GND Equipment Ground  
TB  
Terminal Board  
Factory Wiring  
FL  
Fuse Link  
TRAN — Transformer  
FPT  
HP  
Freeze Protection Thermostat  
Heat Pump  
Field Power Wiring  
Field Control Wiring  
Terminal (Marked)  
HR  
Heater Relay  
Heater  
Terminal (Unmarked)  
Splice  
HTR  
HTT  
IFM  
Printed Circuit Board  
Heater Temp. Thermostat  
Indoor-Fan Motor  
Accessory or Optional Wiring  
NOTES:  
1. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.  
2. Wire in accordance with NEC and local codes.  
3. Transformer is thermally protected and will reset automatically.  
4. Indoor-fan motor(s) are inherently thermally protected.  
Fig. 17 — Control Circuit Connections Arrangement  
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COOL  
HEAT  
AUTO  
SLIMLINE THERMOSTAT  
CARRIER  
FLAT THERMOSTAT (FLATSTAT)  
CARRIER  
HEAT PUMP  
COOLING ONLY  
HEAT & COOL  
COOLING ONLY  
HEAT & COOL  
(53DFS250-SL)  
(53DFS250-FS)  
COOL  
AUTO  
HEAT  
5-1-1 PROGRAMMABLE THERMOSTAT  
CARRIER  
COOLING ONLY  
HEAT & COOL  
(53DFST2-NP)  
Fig. 18 — Thermostats  
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The heat pump unit uses a timed defrost method. The timed  
defrost can be field set for 30, 50, or 90 minutes. The timed de-  
frost is factory set for 90 minutes.  
Step 8 — Make Connections Between Indoor  
and Outdoor Units — The thermostat is wired between  
the indoor and outdoor units to make the system complete.  
CHECK ACCURATER METERING DEVICE — The cor-  
rect AccuRater (bypass type) refrigerant control is required for  
system capacity optimization. An AccuRater device  
(see Fig. 19) is supplied with the outdoor unit. Refer to  
Tables 4A-4C to determine the correct AccuRater piston size  
and charge combination required for the condenser/evaporator  
system being installed.  
Piston style as shown in Fig. 19 is shipped with the unit.  
Do not interchange components between the AccuRater device  
types.  
COOLING ONLY SYSTEMS — The following connec-  
tions must be made to the outdoor unit for it to operate as a sys-  
tem with the indoor unit:  
38HDR018-060  
Route 2 wires of field-supplied 18-gage AWG (American  
Wire Gage) thermostat cable between the low-voltage terminal  
block of the fan coil unit and the blue and brown low-voltage  
wires in the outdoor unit low voltage terminal block. Connect  
the wires Y1 to Y and C to C. See Fig. 20.  
HEAT PUMP SYSTEMS — The following connections  
must be made to the outdoor unit for it to operate as a system  
with the indoor unit:  
Route 5 wires of field-supplied 18-gage AWG thermostat  
cable between the low-voltage terminal block of the fan coil  
and the outdoor unit low-voltage terminal block. Connect Y1  
to Y, R to R, O to O, W2 to W2, and C to C with the wires. See  
Fig. 21.  
38QRR018-060  
Fig. 19 — AccuRater (Bypass Type)  
Metering Device Components  
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Fig. 20 — Cooling System Wiring Diagram  
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Fig. 21 — Heat Pump Wiring Diagram  
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START-UP  
Operating Sequence — Ceiling-suspended fan coil  
units have a relay board which controls system operation in re-  
sponse to a room thermostat. The user may manually select any  
one of 3 fan speeds for unit operation. Ceiling-suspended sys-  
tems may be equipped with an accessory power ventilation kit  
and/or condensate pump.  
Never operate unit without a filter or with grille removed;  
damage to the unit or personal injury may result.  
FAN OPERATION — Fan coils are capable of 3-speed opera-  
tion. 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.  
COOLING MODE OPERATION — When the room ther-  
mostat 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.  
Make the following checks and complete the Start-Up  
Checklist on page CL-1 before system start-up. Also refer to  
the condensing unit Installation, Start-Up and Service Instruc-  
tions for system start-up instructions and refrigerant charging  
methods.  
1. Check condensate drainage system:  
a. Remove grille and frame from the unit.  
b. On the opposite side of the drain connection, insert  
a water bottle up into the fan coil unit and fill drain  
pan. Refer to Fig. 22. Water must flow steadily; if  
not, check the pipe slope or inspect for any pipe  
restrictions.  
The internal condensate pump (if so equipped) runs when-  
ever 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. The compressor will con-  
tinue 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 ven-  
tilation kit, the ventilation fan will operate whenever the indoor  
fan is set for medium or high speed.  
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. 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 de-  
frost board (DFB), which is located in the outdoor unit. The  
microprocessor logic in the DFB is energized when the com-  
pressor starts, and the defrost timer runs. Once every 90 min-  
utes (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.  
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 op-  
eration after 10 minutes. When the DFB changes back to heat-  
ing mode, the RVR (reversing valve relay) is deenergized 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.  
2. Make sure that all wiring connections are correct and  
that they are tight.  
3. Check that all barriers, covers, and panels are in place.  
Ensure that the filters and return-air grilles have been  
installed and that the discharge louvers are positioned  
correctly.  
After Extended Shutdown — If the system has been  
turned off for more than 12 hours and a crankcase heater is be-  
ing used, turn on the indoor and outdoor unit disconnect  
switches to supply power to the system for 12 hours BEFORE  
starting the system.  
Seasonal Changeovers — When changing heat pump  
system from cooling to heating or heating to cooling, or before  
starting cooling only system after it has been out of use for the  
winter season, perform the following steps BEFORE starting  
the system:  
1. Inspect and clean the outdoor unit, particularly the  
coil.  
2. Clean or replace the air filters in the indoor unit.  
3. Clean the indoor unit drain pan and drain pipe, and  
remove any obstructions.  
4. If the outdoor unit is equipped with a crankcase heater,  
turn on indoor and outdoor unit disconnect switches to  
supply power to the system 12 hours before starting  
the system.  
Adjusting Airflow  
AUTOMATIC AIR SWEEP — All units are equipped with  
an air sweep feature which directs the airflow louvers up and  
down to provide optimum room air circulation. The air sweep  
function can be controlled by the toggle switch located on the  
lower right corner of the unit. If using a thermostat with an air  
sweep switch, see Fig. 20 and 21 for wiring modifications.  
Operating Mode Memory — After the system is  
turned off or after a power failure, the system remains in the  
last operating mode selected. When the system is turned back  
on, or when power is automatically restored, operation contin-  
ues in the same operating mode as when the system shut down.  
SYSTEM SAFETIES — The system is equipped with the  
following safety devices to protect system components:  
Indoor coil freeze protection thermostat — If a coil temper-  
ature of 28 F or lower is sensed, the compressor and outdoor  
fan will be shut down until the coil temperature exceeds 28 F.  
The indoor fan will continue to run.  
Automatic Operation (Auto.) Mode — If auto.  
mode is selected, the system automatically switches over the  
operating mode from heating to cooling, or from cooling to  
heating (heat pump system only) depending on the selected  
temperature. Auto. mode also controls fan speed if not manual-  
ly overridden.  
Condensate float switch (units equipped with accessory  
condensate pump, cooling cycle only) — If the level of con-  
densate in the drain pan rises too high, the condensate float  
switch will turn the system off.  
NOTE: Between the cooling cycle and the heating cycle there  
is a neutral zone of approximately 2° F above and 2° F below  
the selected temperature when only the fan is operating.  
18  
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SPECIAL OPERATION, HEATING — Outdoor cooling units  
may be matched with heat pump ceiling-suspended fan coil  
units to provide supplemental electric heat. All other operation  
is the same as a cooling-only system, except these units have  
heating capability as follows:  
When the room thermostat initiates a call for heating, the  
electric heater is turned on. The indoor unit fan will start at the  
same time, if it was not already running.  
When the heating requirement is satisfied, the room thermo-  
stat will open, and the heater will turn off.  
CLEANING AND MAINTENANCE  
Fig. 22 — Inserting Water into Drain Pan  
To avoid the possibility of electric shock, before performing  
any cleaning and maintenance operations, always turn off  
power to the system by pressing the mode button on the  
remote thermostat until the display shows “OFF,” and turn-  
ing off the outdoor disconnect switch located near the out-  
door unit. If the indoor unit is on a separate switch, be sure  
to turn this disconnect off as well.  
Air Filters (Fig. 23)  
Operating the system with dirty air filters may damage the  
indoor unit and, in addition, can cause reduced cooling per-  
formance, intermittent system operation, frost build-up on  
the indoor coil, and blown fuses. Inspect and clean or  
replace the air filters monthly.  
Do not wash filter in water over 120 F (to avoid shrinkage).  
Do not expose filter to fire (to avoid fire damage). Do not  
expose filter to direct sunlight. Clean filter more frequently  
when air is extremely dirty.  
REMOVE AIR FILTERS — Remove filters by pulling them  
straight out.  
CLEAN OR REPLACE FILTERS — Filters can be vacu-  
umed or washed in warm water. Shake filter to remove any ex-  
cess water, and replace by sliding filter behind grille until filter  
snaps in place. Refer to Fig. 23.  
For proper system operation, perform the cleaning and  
maintenance operations in Table 6.  
Lubrication — The indoor-fan, automatic air sweep, and the  
outdoor-fan motors are factory lubricated and require no oiling.  
If the filter has begun to break down or is torn, replace it.  
Replacement filters are available through your dealer.  
Table 6 — 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  
Clean Indoor Unit Front Panel  
X
X
X
X
OUTDOOR UNIT  
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.  
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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 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.  
Clean Outdoor Coil (Outdoor Unit)  
Some metal parts and sharp fins of outdoor unit coil can  
cause personal injury during cleaning. Clean coil carefully.  
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.  
Fig. 23 — Cleaning Filters  
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.  
Before Calling for Service — Save the cost of a service  
call by doing the following:  
CLEAN OR REPLACE DRAIN PAN  
1. Be sure main power to system is turned on.  
2. Press Mode button until OFF is displayed. Wait 5 min-  
utes.  
3. Press Mode button until either COOL or HEAT is dis-  
played (as desired).  
4. Adjust thermostat set point to desired room tempera-  
ture. If system starts within a few minutes, service may  
not be necessary. If system does not operate properly,  
check Table 7 for typical solutions.  
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  
(attached).  
3. Remove the condensate water in the drain pan by let-  
ting water drain into a 3-gallon bucket.  
Do not use a screwdriver to pry drain pan out of assembly  
— it could damage the pan.  
IF SYSTEM FAILS TO OPERATE — Be sure:  
• unit ON/OFF switch is in ON position  
• fuse or circuit breaker is not tripped  
4. Remove the 4 screws holding the drain pan.  
5. Carefully hold the drain pan to remove it from the  
assembly.  
FRESH AIR INSTALLATION OPTION  
The units have an installation option, which allows for field  
installation of fresh air ventilation. Plan the installation careful-  
ly. Before beginning, measure carefully and follow acceptable  
building practices, NEC, and local codes.  
SERVICE  
Ventilation-Air Accessory — Refer to ventilation air  
accessory installation instructions.  
When servicing unit, turn off all electric power to unit to  
avoid shock hazard or injury from rotating parts.  
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 7 for some common prob-  
lems, causes, and typical solutions. See Fig. 20 and 21 for addi-  
tional system troubleshooting details. If the problem cannot be  
corrected, contact a local dealer for further assistance.  
Do not vent refrigerant to atmosphere when servicing unit.  
Recover refrigerant during system repair or unit removal.  
20  
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Table 7 — Troubleshooting  
PROBLEM  
CAUSE  
TYPICAL SOLUTION  
System Does Not Start.  
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.  
Unit is in off mode.  
Press Mode button on thermostat until thermostat  
displays the desired unit mode.  
Three-minute time delay is running.  
Wait for 3 minutes.  
Temperature is above or below the selected  
temperature.  
Select new temperature using the thermostat.  
System Does Not Cool Properly. Air filter(s) in indoor unit is dirty or needs to be  
Clean or replace air filter(s).  
replaced.  
Temperature is set too high or too low.  
Reset temperature to desired comfort setting using  
the thermostat.  
Outdoor unit outdoor coil restricted.  
Fan speed is set too low.  
Remove obstruction.  
Adjust fan speed to high or auto. using the Fan  
button on the thermostat.  
System Does not Heat Properly. Air filter(s) in indoor unit is dirty or needs to be  
Clean or replace air filter(s).  
replaced.  
Temperature is set too high or too low.  
Reset temperature to desired comfort setting using  
the thermostat.  
Outdoor unit outdoor coil restricted.  
Fan speed is set too low.  
Remove obstruction.  
Adjust fan speed to high or auto. using the Fan  
button on the thermostat.  
Outdoor unit outdoor coil is frosted up.  
Check manual defrost timer setting and adjust as  
necessary.  
Ice or frost has Formed  
on Indoor Coil.†  
Low outdoor-air temperature.  
Air filter(s) in indoor unit is dirty or needs to be  
replaced.  
Run system in fan-only mode until frost is gone.  
Clean or replace air filter(s).  
Insufficient Airflow.  
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).  
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 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  
without appropriate accessories.  
21  
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SERVICE TRAINING  
START-UP CHECKLIST  
Packaged Service Training programs are an excellent way to increase your knowledge of the equipment  
discussed in this manual, including:  
• Unit Familiarization  
• Installation Overview  
• Maintenance  
• Operating Sequence  
A large selection of product, theory, and skills programs are available, using popular video-based formats  
and materials. All include video and/or slides, plus companion book.  
Classroom Service Training which includes “hands-on” experience with the products in our labs can mean  
increased confidence that really pays dividends in faster troubleshooting and fewer callbacks. Course  
descriptions and schedules are in our catalog.  
CALL FOR FREE CATALOG 1-800-644-5544  
[
] Packaged Service Training  
[
] Classroom Service Training  
Copyright 2006 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Catalog No. 02-40QA0007-SI Printed in U.S.A. Form 40QA-7SI Pg 22 706 3-06 Replaces: 40QA-5SI  
Book 1  
4
Tab 3d 2c  
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START-UP CHECKLIST  
I. PRELIMINARY INFORMATION  
OUTDOOR UNIT: MODEL NO. ___________________  
INDOOR UNIT: MODEL NO. _____________________  
SERIAL NO. ___________________________________  
SERIAL NO. ___________________________________  
ACCESSORIES: __________________________________________________________________________________  
PISTONS: INDOOR SIZE: ____________  
OUTDOOR SIZE: ____________  
REFRIGERANT PIPING: EQUIVALENT LINE LENGTH: ____________  
LIFT: FAN COIL ABOVE OUTDOOR UNIT? ____________  
FAN COIL BELOW OUTDOOR UNIT? ____________  
II. PRE-START-UP  
INDOOR UNIT (REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS FOR OUTDOOR UNIT  
PRE-START-UP FUNCTIONS)  
IS THERE ANY SHIPPING DAMAGE? ____________  
IF YES, WHERE? ____________________________________  
WILL THIS DAMAGE PREVENT UNIT START-UP? ____________  
IS POWER SUPPLY CORRECT? ____________  
HAS GROUND WIRE BEEN CONNECTED? ____________  
HAS THE CORRECT SIZE FUSE OR HACR BREAKER BEEN PROVIDED? ____________  
ARE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY? ____________  
IS THE DISCONNECT SWITCH INSTALLED WITHIN SIGHT OF THE UNIT? ____________  
IS THE LOW-VOLTAGE CABLE (INDOOR TO OUTDOOR UNIT) RUN AND CONNECTED PROPERLY? ____________  
HAS CONDENSATE DRAIN BEEN RUN, SLOPED AND TRAPPED PROPERLY? ____________  
IS FILTER(S) IN PLACE? ____________  
IS UNIT MOUNTED LEVEL? ____________  
IS HEATING PISTON INSTALLED (FIG. 13), THE CORRECT SIZE, AND IN THE CORRECT DIRECTION? ____________  
III. PIPING  
IS A LIQUID LINE SOLENOID INSTALLED IF REQUIRED BY LONG-LINE APPLICATIONS ? ____________  
IS FILTER DRIER INSTALLED AT THE OUTDOOR UNIT? ____________  
HAVE LEAK CHECKS BEEN MADE AT THE COMPRESSOR, OUTDOOR UNIT, FLARE CONNECTIONS, FILTER  
DRIERS, AND FUSIBLE PLUGS WITH A LEAK DETECTOR?* ____________  
*FIELD PIPING AND ALL TUBING CONNECTIONS MUST BE LEAK TESTED BY THE PRESSURE METHOD DE-  
SCRIBED IN CARRIER GENERAL TRAINING FOR AIR CONDITIONING MANUAL (GTAC2), MODULE 5. USE R-22  
AT APPROXIMATELY 25 PSIG BACKED UP WITH AN INERT GAS TO REACH A TOTAL SYSTEM PRESSURE NOT  
TO EXCEED 245 PSIG.  
CL-1  
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START-UP CHECKLIST (cont)  
HAS PIPING SYSTEM BEEN EVACUATED TO 1000 MICRONS (IF REQUIRED)? ____________  
HAS SYSTEM CHARGE BEEN WEIGHED IN (IF REQUIRED)? ____________  
HAVE SERVICE VALVES BEEN FULLY BACKSEATED? ____________  
CHECK VOLTAGE: IS VOLTAGE WITHIN RANGE SHOWN FOR UNIT (WITH UNIT OPERATING)?  
OUTDOOR ____________  
INDOOR ____________  
IV. START-UP  
IF UNIT HAS A CRANKCASE HEATER, HAS IT BEEN ON FOR 24 HOURS? ____________  
MEASURE AND RECORD THE:  
AIR ENTERING OUTDOOR UNIT: ____________ F  
AIR ENTERING INDOOR UNIT: ____________ F  
DISCHARGE LINE TEMPERATURE: ____________ F  
VAPOR LINE TEMPERATURE: ____________ F  
MEASURE AND RECORD THE:  
VAPOR LINE PRESSURE: ____________ PSIG  
DISCHARGE PRESSURE: ____________ PSIG  
START-UP CHECKLIST  
I. PRELIMINARY INFORMATION  
OUTDOOR UNIT: MODEL NO.  
INDOOR UNIT: MODEL NO.  
SERIAL NO.  
SERIAL NO.  
ACCESSORIES: __________________________________________________________________________________  
PISTONS (38HDC and 38QRC SYSTEMS ONLY): INDOOR SIZE: OUTDOOR SIZE  
(38QRC SYSTEMS ONLY):  
REFRIGERANT PIPING: EQUIVALENT LINE LENGTH:  
(IF OVER 50 FT)*  
LIFT: FAN COIL ABOVE OUTDOOR UNIT (IF OVER 25 FT)*?  
FAN COIL BELOW OUTDOOR UNIT (IF OVER 25 FT)*?  
*APPLIES ONLY TO 38HDC AND 38QRC UNITS USING LONG-LINES APPLICATIONS. MAXIMUM EQUIVALENT  
LINE LENGTH FOR 38HDS SYSTEMS IS 50 FT. MAXIMUM LIFT ON 38HDS APPLICATIONS IS 30 FT FROM LOW-  
EST SYSTEM POINT TO HIGHEST SYSTEM POINT.  
PRE-START-UP  
INDOOR UNIT (REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS FOR OUTDOOR UNIT PRE-START-UP  
FUNCTIONS)  
IS THERE ANY SHIPPING DAMAGE?  
IF YES, WHERE?  
WILL THIS DAMAGE PREVENT UNIT START-UP?  
IS POWER SUPPLY CORRECT?  
(115-V FOR 40QAB024-048, 115 V UNITS; OR 208/230 V FOR 40QAB024-  
048, 208/230 V UNITS AND ALL 40QAB060 AND 40QAE024-060 UNITS. ALL SYSTEMS REQUIRE SINGLE-PHASE  
POWER)  
HAS GROUND WIRE BEEN CONNECTED?  
HAS THE CORRECT SIZE FUSE OR HACR BREAKER BEEN PROVIDED? ARE POWER WIRES  
TO THE UNIT SIZED AND INSTALLED PROPERLY? IS THE DISCONNECT SWITCH IN-  
STALLED IN SIGHT FROM THE UNIT?  
IS THE LOW-VOLTAGE CABLE (INDOOR TO OUTDOOR UNIT) RUN AND CONNECTED PROPERLY?  
Copyright 2006 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 1  
4
Catalog No. 02-40QA0007-SI  
Printed in U.S.A.  
Form 40QA-7SI  
Pg CL-2  
706  
3-06 Replaces: 40QA-5SI  
Tab 3d 2c  
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