Carrier Air Conditioner 38CKB User Manual

38CKB—50 Hz  
Air Conditioning Unit  
Installation and Start-Up Instructions  
NOTE: Read the entire instruction manual before starting the  
installation.  
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 thor-  
oughly and follow all warnings or cautions included in literature  
and attached to the unit. Consult local building codes and national  
electric codes for special requirements.  
A94356  
Fig. 1—Model 38CKB  
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.  
For proper airflow, a 6-in. (152mm) clearance on 1 side of unit and  
12 in. (305mm) on all remaining sides must be maintained.  
Maintain a distance of 24 in. (610mm) between air conditioners.  
Position so water, snow, or ice from roof or eaves cannot fall  
directly on unit.  
Understand the signal word DANGER, WARNING, or CAU-  
TION. These words are used with the safety-alert symbol. DAN-  
GER 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.  
On rooftop applications, locate unit 6 in. (152mm) above roof  
surface. Where possible, place unit above a load-bearing wall.  
Arrange supporting members to adequately support unit and  
minimize transmission of vibration to building. Consult local  
codes governing rooftop applications.  
Before installing, modifying, or servicing system, main elec-  
trical 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. Electrical shock can  
cause personal injury or death.  
Step 3—Replace Indoor AccuRater® Piston, if Required  
Check indoor coil piston to see if it matches the required piston  
shown on unit rating label. If it does not match, replace indoor coil  
piston with piston shipped with this unit. The piston shipped with  
outdoor unit is correct for any approved indoor coil combination.  
INSTALLATION  
Step 1—Check Equipment and Jobsite  
UNPACK UNIT — Move to final location. Remove carton taking  
care not to damage unit.  
Remove indoor coil piston if unit is to be installed on system  
with a TXV metering device.  
INSPECT EQUIPMENT — File claim with shipping company  
prior to installation if shipment is damaged or incomplete. Locate  
unit rating label on unit service panel. (See Fig. 2.) It contains  
information needed to properly install unit. Check rating label to  
be sure unit matches job specifications.  
Step 4—Make Piping Connections  
Outdoor units may be connected to indoor sections using accessory  
tubing package or field-supplied refrigerant grade tubing of correct  
size and condition. For tubing requirements beyond 50 ft (15.24m),  
consult Long-Line Application Guideline which is available at  
your local distributor.  
Step 2—Install on a Solid, Level Mounting Pad  
If conditions or local codes require the unit be attached to pad,  
tiedown bolts should be used and fastened through knockouts  
provided in unit base pan. Refer to unit mounting pattern in Fig. 2  
to determine base pan size and knockout hole location.  
NOTE: In some cases, noise in the living area has been traced to  
gas pulsations from improper installation of equipment.  
INSTALLATION RECOMMENDATIONS  
1. Locate the unit away from windows.  
When installing, allow sufficient space for airflow clearance,  
wiring, refrigerant piping, and service. Allow 30-in. (762mm)  
clearance to service end of unit and 48 in. (1219mm) above unit.  
2. Ensure that vapor and liquid tube diameters are appropriate to  
the capacity of the unit. (See Table 1.)  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 3a 2a  
1
4
PC 101  
Catalog No. 013-862  
Printed in U.S.A.  
Form 38CKB-C1SI  
Pg 1  
12-94  
Replaces: New  
 
Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters  
LIQUID  
VAPOR  
UNIT SIZE  
Connection Dia.  
In. mm  
Tube Dia.  
mm  
Connection Dia.  
Tube Dia.  
In.  
3/8  
3/8  
3/8  
3/8  
In.  
mm  
In.  
5/8  
mm  
018, 024  
036  
3/8  
3/8  
3/8  
3/8  
9.53  
9.53  
9.53  
9.53  
9.53  
9.53  
9.53  
9.53  
5/8  
3/4  
7/8  
7/8  
15.88  
19.05  
22.23  
22.23  
15.88  
19.05  
22.23  
28.58  
3/4  
048  
7/8  
060  
1-1/8  
1. Tube diameters are for lengths up to 50 ft (15.24m). For tube sets over 50 ft (15.24m), consult Long-Line Application Guideline.  
2. Do not apply capillary tube indoor coils to these units.  
NOTE: Operation of unit on improper line voltage constitutes  
abuse and could affect unit reliability. See unit rating label. Do not  
install unit in system where voltage or phase imbalance may  
fluctuate above or below permissible limits.  
To prevent damage to unit or service valves observe the  
following:  
• Use a brazing shield.  
• Wrap service valves with wet cloth or use a heat sink  
material.  
NOTE: Use copper wire only between disconnect switch and  
unit.  
NOTE: Install branch circuit disconnect per local codes of  
adequate size to handle unit starting current. Locate disconnect  
within sight from and readily accessible from unit per local codes.  
SWEAT CONNECTION — Use refrigerant grade tubing. Service  
valves are closed from factory and ready for brazing. After  
wrapping the service valve with a wet cloth, the tubing set can be  
brazed to the service valve using either silver bearing or non-silver  
bearing brazing material. Consult local code requirements. Refrig-  
erant tubing and indoor coil are now ready for leak testing. This  
check should include all field and factory joints.  
To avoid personal injury or death, do not supply power to unit  
with compressor terminal box cover removed.  
NOTE: Avoid contact between tubing and structure.  
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. Failure to follow this warning can result in an  
electric shock, fire, or death.  
OUTDOOR WALL  
CAULK  
INDOOR WALL  
LIQUID TUBE  
ROUTE GROUND AND POWER WIRES — Remove access  
panel and control box cover to gain access to unit wiring. Extend  
wires from disconnect through power wiring hole provided and  
into unit control box. (See Fig. 2.) Size wires per local codes, but  
not smaller than minimum wire size shown on unit rating label.  
VAPOR TUBE  
JOIST  
INSULATION  
THROUGH THE WALL  
CONNECT GROUND AND POWER WIRES — Connect ground  
wire to ground connection in control box for safety. Connect  
power wiring to contactor as shown in Fig. 4.  
HANGER STRAP  
(AROUND VAPOR  
TUBE ONLY)  
INSULATION  
VAPOR TUBE  
DISCONNECT  
PER N.E.C. AND/OR  
LOCAL CODES  
CONTACTOR  
FIELD POWER  
WIRING  
1MIN  
(25 mm)  
LIQUID TUBE  
BLUE  
3 PHASE ONLY  
SUSPENSION  
FIELD GROUND  
WIRING  
A94330  
Fig. 3—Piping Installation  
GROUND  
LUG  
A94025  
Fig. 4—Line Power Connections  
Step 5—Make Electrical Connections  
Be sure field wiring complies with local and national fire, safety,  
and electrical codes, and voltage to system is within limits shown  
on unit rating label. Contact local power company for correction of  
improper voltage. See unit rating label for recommended circuit  
protection device.  
NOTE: Use No. 18 AWG (American Wire Gage) color-coded,  
insulated (35° C minimum) wire. If thermostat is located more than  
100 ft (30.5m) from unit as measured along the control voltage  
wires, use No. 16 AWG color-coded wires to avoid excessive  
voltage drop.  
3
 
CONNECT CONTROL WIRING — Route 24-v control wires  
through control wiring grommet and connect to brown and blue  
pigtails supplied in unit splice box. (See Fig. 5.)  
Do not vent refrigerant to atmosphere. Recover during system  
repair or final unit disposal.  
Use furnace transformer, fan-coil transformer, or accessory trans-  
former for control power, 24-v/40va minimum.  
1. Fully back seat (open) liquid and vapor tube service valves.  
NOTE: Use of available 24-v accessories may exceed the mini-  
mum 40-va power requirement. Determine total transformer load-  
ing and increase the transformer capacity or split the load with an  
accessory transformer as required.  
2. Unit is shipped with valve stem(s) front seated and caps  
installed. Replace stem caps after system is opened to refrig-  
erant flow (back seated). Replace caps finger-tight and tighten  
additional 1/6 turn with wrench.  
Step 6—Compressor Crankcase Heat  
3. Close electrical disconnects to energize system.  
When equipped with a crankcase heater, energize heater a mini-  
mum of 24 hrs before starting unit. To energize heater only, set  
thermostat to OFF position and close electrical disconnect to  
outdoor unit.  
A crankcase heater is required if the refrigerant tubing is longer  
than 50 ft (15.24m).  
4. Set room thermostat at desired temperature. Be sure set point  
is below indoor ambient temperature.  
5. Set room thermostat at COOL and fan switch at FAN or  
AUTO, as desired. Operate unit for 15 minutes. Check system  
refrigerant charge.  
Step 7—Install Electrical Accessories, If Any  
6. Factory charge is shown on unit rating label. Adjust charge by  
following procedure shown on charging tables located on unit.  
Refer to the individual instructions packaged with the kit or  
accessory when installing.  
Step 9—Leave User’s Manual with Owner  
Step 8—Start-Up and Check Charge  
For continued high performance and to minimize possible equip-  
ment failure, periodic maintenance MUST be performed on this  
equipment.  
Leave User’s Manual with owner. Explain system operation and  
periodic maintenance requirements outlined in manual. Frequency  
of maintenance may vary depending on geographic areas, such as  
coastal applications which require more frequent maintenance.  
To prevent compressor damage or personal injury, observe  
the following:  
• Do not overcharge system with refrigerant.  
• Do not operate unit in a vacuum or at negative pressure.  
• Do not disable low-pressure switch.  
In scroll compressor applications:  
• Dome temperatures may be hot.  
• In 3 phase application, incorrect phasing will cause reverse  
rotation, resulting in elevated noise levels, equalized pres-  
sures and reduced current draw. Correct by reversing power  
connection L1 and L2 on contactor.  
To prevent personal injury wear safety glasses, protective  
clothing, and gloves when handling refrigerant and observe  
the following:  
• Back seating service valves are not equipped with Schrader  
valves. Fully back seat (counter clockwise) valve stem before  
removing gage port cap.  
• Front seating service valves are equipped with Schrader  
valves.  
4
 
THERMOSTAT  
R
THERMOSTAT  
R
FURNACE  
R
C
MOTOR  
POWER  
SUPPLY  
M
G
Y
G
Y
G
Y
C
IFR  
TRANS  
C
W
/
W
W1  
COOLING ONLY  
FAN COIL  
ONE STAGE COOLING / GAS HEATING  
THERMOSTAT  
R
THERMOSTAT  
R
INDOOR UNIT  
R
C
R
C
G
Y
G
Y
C
G
Y
G
Y
LLS  
C
W
W2  
W
W
ONE STAGE COOLING / ELECTRIC HEAT  
ONE STAGE COOLING / HEATING  
ACCESSORY LIQUID LINE SOLENOID  
NOTES:  
1. Wiring must conform to local codes.  
2. LLS required on some units. See specific unit instructions.  
3. Transformer required is 24-v, 40-va minimum. A 60-va or external power source may  
be necessary when installing accessories.  
4. When installing electronic thermostat, connect transformer common to thermostat C.  
LEGEND:  
C
M
– COMPRESSOR CONTACTOR  
– INDOOR FAN MOTOR  
LLS – LIQUID LINE SOLENOID  
TRANS – TRANSFORMER  
IFR – INDOOR FAN RELAY  
A94331  
Fig. 5—24-v Control Circuit Connections  
5
 
Copyright 1994 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231  
38ckbc1s  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 3a 2a  
1
4
PC 101  
Catalog No. 013-862  
Printed in U.S.A.  
Form 38CKB-C1SI  
Pg 6  
12-94  
Replaces: New  
 

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