Carrier Heat Pump 38YCX User Manual

38YCX—50 Hz  
Heat Pump—Outdoor Section  
Installation and Start-Up Instructions  
NOTE: Read the entire instruction manual before starting the  
installation.  
This symbol indicates a change since the last issue.  
SAFETY CONSIDERATIONS  
Improper installation, adjustment, alteration, service, maintenance,  
or use can cause explosion, fire, electrical shock, or other  
conditions which may cause 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 pack-  
aged with the kits or accessories when installing.  
IP24  
Follow all safety codes. Wear safety glasses and work gloves. Use  
quenching cloth for brazing operations. Have fire extinguisher  
available. Read these instructions thoroughly and follow all  
warnings or cautions attached to the unit. Consult local building  
codes and the national electric codes for special installation  
requirements.  
Recognize safety information. This is the safety-alert symbol  
When you see this symbol on the unit or in instructions and  
manuals, be alert to the potential for personal injury.  
.
Understand the signal words DANGER, WARNING, and 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. NOTE is used to highlight  
suggestions which will result in enhanced installation, reliability,  
or operation.  
A97005  
Fig. 1—Model 38YCX  
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.  
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 units. Position so  
water, snow, or ice from roof or eaves cannot fall directly on unit.  
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.  
On rooftop applications, locate unit at least 6 in. (152mm) above  
roof surface. Place unit above a load-bearing wall and isolate unit  
and tubing set from structure.  
Arrange supporting members to adequately support unit and  
minimize transmission of vibration to building. Consult local  
codes governing rooftop applications.  
INSTALLATION  
Step 1—Check Equipment and Job Site  
Step 3—Elevate Unit  
UNPACK UNIT — Move to final location. Remove carton taking  
care not to damage unit.  
INSPECT EQUIPMENT — File claim with shipping company  
prior to installation if shipment is damaged or incomplete. Locate  
unit rating plate on unit corner panel. (See Fig. 2.) It contains  
information needed to properly install unit. Check rating plate to  
be sure unit matches job specifications.  
Accumulation of water and ice in base pan may cause  
equipment damage.  
In areas where prolonged freezing temperatures are encountered,  
elevate unit per local climate and code requirements to provide  
clearance above estimated snowfall level and ensure adequate  
drainage of unit. (See Fig. 3.)  
Step 2—Install on a Solid, Level Mounting Pad  
If conditions or local codes require the unit be attached to pad, tie  
down 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.  
Step 4—Replace Indoor AccuRater® Piston (if required)  
Check indoor coil piston to see if it matches the required piston  
shown on outdoor unit rating plate. (See Fig. 2.) If it does not  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 5a 5a  
1
4
PC 101  
Catalog No. 003-880  
Printed in U.S.A.  
Form 38YCX-C3SI  
Pg 1  
2-02  
Replaces: 38YCX-C2SI  
 
Table 1Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters  
LIQUID  
VAPOR  
UNIT SIZE  
Connection Dia.  
In. mm  
Tube Dia.  
mm  
Connection DIia.  
Vapor Dia.  
In.  
3/8  
3/8  
3/8  
3/8  
In.  
mm  
In.  
5/8  
mm  
024  
036  
048  
060  
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  
7/8  
1-1/8  
NOTES: 1. Tube diameters are for lengths up to 50 ft (15.24m). For tubing lengths greater than 50 ft (15.24m), consult Long-Line Application Guideline.  
2. Do not apply capillary tube indoor coils to these units.  
NOTE:Avoid contact between tubing and structure.  
OUTDOOR WALL  
CAULK  
INDOOR WALL  
To prevent compressor damage DO NOT bury more than 36  
in. of refrigerant tubing. If ANY tubing is buried, provide 6  
in. vertical rise at service valve.  
LIQUID TUBE  
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.  
VAPOR TUBE  
JOIST  
INSULATION  
THROUGH THE WALL  
Outdoor units may be connected to indoor section 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 from  
your local distributor.  
HANGER STRAP  
(AROUND VAPOR  
TUBE ONLY)  
INSULATION  
VAPOR TUBE  
NOTE: In some cases noise in the living area has been traced to  
gas pulsations from improper installation of equipment.  
INSTALLATION RECOMMENDATIONS  
1. Locate unit away from windows.  
1MIN  
2. Ensure that vapor and liquid tube diameters are appropriate to  
capacity of unit. (See Table 1.)  
(25 mm)  
LIQUID TUBE  
SUSPENSION  
3. Run refrigerant tubes as directly as possible by avoiding  
unnecessary turns and bends.  
A94330  
4. Leave some slack between structure and unit to absorb  
vibration.  
Fig. 4Piping Installation  
5. When passing refrigerant tubes through the wall, seal opening  
with RTV or other pliable silicon-based caulk. (See Fig. 4.)  
PISTON BODY  
6. Avoid direct tubing contact with water pipes, ductwork, floor  
joists, wall studs, floors, and walls.  
7. Do not suspend refrigerant tubing from joists and studs with a  
rigid wire or strap which comes in direct contact with tubing.  
(See Fig. 4.)  
8. Ensure that tubing insulation is pliable and completely sur-  
rounds vapor tube.  
PISTON  
9. When necessary, use hangar straps which are 1 in. (25mm)  
wide and conform to shape of tubing insulation. (See Fig. 4.)  
PISTON RETAINER  
10. Isolate hangar straps from insulation by using metal sleeves  
bent to conform to shape of insulation.  
SWEAT/FLARE ADAPTER  
If refrigerant tubes or indoor coil is exposed to atmosphere, it must  
be evacuated to 500 microns to eliminate contamination and  
moisture in the system.  
A94029  
Fig. 5Service Valve with Sweat Adapter Tube  
OUTDOOR UNIT CONNECTED TO FACTORY-APPROVED  
INDOOR UNIT Outdoor unit contains correct system refriger-  
ant charge for operation with indoor unit of same size when  
connected by 15 ft (4.55m) of field-supplied or factory-accessory  
tubing. Check refrigerant charge for maximum efficiency.  
3
 
REFRIGERANT TUBING Connect tubing to fittings on out-  
door unit vapor and liquid service valves. (See Fig. 2 and 5.)  
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.  
SWEAT CONNECTION Use refrigerant grade tubing. Service  
valves are closed from factory and ready for brazing. After  
wrapping service valve with a wet cloth, tubing set can be brazed  
to service valve using either silver bearing or non-silver bearing  
brazing material. Consult local code requirements. Refrigerant  
tubing and indoor coil are now ready for leak testing. This check  
should include all field and factory joints.  
NOTE: Use No. 18 AWG (American Wire Gage) color-coded,  
insulated (35°C minimum) wires. 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.  
Step 6Make Electrical Connections  
To avoid personal injury or death, do not supply power to unit  
with compressor terminal box cover removed.  
CONNECT CONTROL WIRING Route 24-v control wires  
through control wiring grommet and connect leads to control  
wiring terminal board. (See Fig. 7.)  
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 plate. Contact local power company for correction of  
improper voltage. See unit rating plate for recommended circuit  
protection device.  
Use furnace transformer, fan coil transformer, or accessory trans-  
former for control power, 24-v/40-va minimum.  
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.  
NOTE: Operation of unit on improper line voltage constitutes  
abuse and could affect unit reliability. See unit rating plate. Do not  
install unit in system where voltage may fluctuate above or below  
permissible limits.  
NOTE: The defrost timer is factory set for 90-minute cycles. The  
timer can be field set for 30- and 50-minute cycles depending on  
defrost conditions in your geographic location.  
NOTE: Use copper wire only between disconnect switch and  
unit.  
Step 7Compressor Crankcase Heater  
NOTE: Install branch circuit disconnect per local codes to handle  
unit starting current. Locate disconnect within sight from and  
readily accessible from unit per local codes.  
When equipped with a crankcase heater, energize heater a mini-  
mum of 24 hr before starting unit. To energize heater only, set  
thermostat to OFF and close electrical disconnect to outdoor unit.  
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 plate.  
A crankcase heater is required if the refrigerant tubing is longer  
than 50 ft.  
Step 8Install Electrical Accessories  
Refer to the individual instructions packaged with the kits or  
accessories when installing.  
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. 6.  
Step 9Start-up and Check Charge  
DISCONNECT PER  
IEC AND/OR  
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:  
LOCAL CODES  
FIELD POWER  
CONTACTOR  
L1  
WIRING  
L1  
L2/N  
L3  
N FOR 1-PHASE ONLY  
3-PHASE ONLY  
Dome temperatures may be hot.  
L2/N  
L3  
To prevent personal injury wear safety glasses, protective  
clothing, and gloves when handling refrigerant and observe  
the following:  
PE  
PE  
Back seating service valves are not equipped with Schrader  
valves. Fully back seat (counter clockwise) valve stem before  
removing gage port cap.  
GROUND  
LUG  
Front seating service valves are equipped with Schrader  
valves.  
A96650  
Fig. 6Line Power Connections  
4
 
FB4ASX  
FB4ASX  
HEAT PUMP  
R
HEAT PUMP  
R
FAN COIL  
FAN COIL  
THERMOSTAT  
THERMOSTAT  
R
G
C
R
G
R
G
C
R
G
C
C
C
C
W2  
E
W2  
W2  
W2  
E
W2  
E
W2  
ODTS  
BLU  
L
L
W3  
O
Y
O
Y
O
Y
O
Y
SYSTEMS WITH ONE  
OUTDOOR THERMOSTAT  
SYSTEMS WITHOUT  
OUTDOOR THERMOSTAT  
A97053  
A97054  
FB4ASX  
FAN COIL  
THERMOSTAT  
HEAT PUMP  
R
R
G
R
G
C
C
C
W2  
L
W2  
W2  
ODTS1  
BLU  
VIO  
W3  
E
E
ODTS2  
O
Y
O
Y
C
1
4
7
C
9
6
3
EMERGENCY HEAT RELAY  
SYSTEMS WITH TWO  
OUTDOOR THERMOSTATS  
A97052  
Fig. 724-v Control Circuit Connections  
5
 
Do not vent refrigerant to atmosphere. Recover during system  
repair or final unit disposal.  
1. If equipped with a crankcase heater, energize a minimum of  
24 hr before starting unit. To energize heater only, set  
thermostat OFF and close electrical disconnect to outdoor  
unit.  
2. Fully open liquid and vapor service valves.  
3. Unit is shipped with valve stem(s) front seated and caps  
installed. Replace stem caps after system is opened to refrig-  
erant flow. Replace caps finger tight and tighten additional 1/6  
turn using a backup wrench on valve body flats to prevent  
distortion of sheet metal.  
A00010  
Fig. 8Phase Monitor Control  
4. Close electrical disconnects to energize system.  
5. Set room thermostat at desired temperature.  
Table 2Phase Monitor LED Indicators  
LED  
OFF  
STATUS  
6. Set room thermostat to HEAT or COOL and fan to ON or  
AUTO mode, as desired. Operate unit for 15 minutes. Check  
system refrigerant charge.  
No call for compressor  
operation  
FLASHING  
ON  
Reversed phase  
Normal  
7. Factory charge is shown on unit rating plate. Adjust charge in  
cooling mode by following procedure shown in charging  
table. Check charge in heating mode by following procedure  
shown on heating check chart. Both are located on unit.  
Should the temperature continue to fall, R-W2 is made through the  
second-stage room thermostat bulb. Circuit R-W2 energizes a  
sequencer, bringing on the first bank supplemental electric heat  
and providing electrical potential to the second heater sequencer (if  
used). If outdoor temperature falls below the setting of the outdoor  
thermostat (field-installed option), contacts close to complete the  
circuit and bring on the second bank of supplemental electric heat.  
3-phase scroll compressors are rotation sensitive.  
A flashing LED on phase monitor indicates reverse rotation.  
(See Fig. 8 and Table 2.)  
This will not allow contactor to be energized.  
Disconnect power to unit and interchange 2 field wiring  
leads on unit contactor.  
When the thermostat is satisfied, its contacts open, de-energizing  
contactor and sequencer. All heaters and motors should stop.  
Quiet Shift  
SEQUENCE OF OPERATION With power supplied to indoor  
and outdoor units, transformer is energized. Defrost control board  
is equipped with 5-minute lockout timer which may be initiated  
upon any interruption of power.  
Quiet Shift is a field-selectable defrost mode, which will eliminate  
occasional noise that could be heard at the start of the defrost cycle  
and restarting of heating cycle. It is selected by placing DIP switch  
3 (on defrost board) in ON position.  
Cooling  
When Quiet Shift switch is placed in ON position, and a defrost is  
initiated, the following sequence of operation will occur. Revers-  
ing valve will energize, compressor will turn off for 30 sec, then  
turn back on to complete defrost. At the start of heating cycle after  
conclusion of defrost mode, reversing valve will de-energize, the  
compressor will turn off for another 30 sec, and the fan will turn  
off for 40 sec, before starting in the heating mode.  
On a call for cooling, the thermostat makes circuits R-O, R-Y, and  
R-G. Circuit R-O energizes reversing valve, switching it to cooling  
position. On three phase models with scroll compressors, the units  
are equipped with a phase monitor to detect if the incoming power  
is correctly phased for compressor operation. (See Fig. 8 and Table  
2.) If phasing is correct, circuit R-Y energizes contactor, starting  
outdoor fan motor and compressor circuit. R-G energizes indoor  
unit blower relay, starting indoor blower motor on high speed.  
Defrost  
The defrost control is a time/temperature control which includes a  
field-selectable time period (DIP switch 1 and 2 on the board)  
between defrost cycles of 30, 60, 90, or 120 minutes (factory set at  
90 minutes).  
NOTE: If the phasing is incorrect, the contactor will not be  
energized. To correct the phasing, interchange any two of the three  
power connections on the field side.  
When thermostat is satisfied, its contacts open, de-energizing  
contactor and blower relay. Compressor and motors stop.  
To initiate a forced defrost, two options are available depending on  
the status of the defrost thermostat.  
NOTE: If indoor unit is equipped with a time-delay relay circuit,  
the blower runs an additional 90 sec to increase system efficiency.  
If defrost thermostat is closed, speedup pins (J1) must be shorted  
by placing a flat head screwdriver in between for 5 sec and  
releasing, to observe a complete defrost cycle. When the Quiet  
Shift switch is selected, compressor will be turned off for two 30  
sec intervals during this complete defrost cycle as explained  
previously. When Quiet Shift switch is in factory default OFF  
position, a normal and complete defrost cycle will be observed.  
Heating  
On a call for heating, the thermostat makes circuits R-Y and R-G.  
If phasing is correct, circuit R-Y energizes contactor, starting  
outdoor fan motor and compressor. Circuit R-G energizes indoor  
blower relay, starting blower motor on high speed.  
6
 
If defrost thermostat is in open position, and speedup pins are  
shorted (with a flat head screwdriver) for 5 sec and released, a  
short defrost cycle will be observed (actual length is dependent  
upon the selected Quiet Shift position). When Quiet Shift switch is  
in ON position, the length of defrost is 1 minute (30 sec  
compressor off period followed by 30 sec of defrost with com-  
pressor operation). On return to heating operation, compressor will  
again turn off for an additional 30 sec and the fan for 40 sec. When  
the Quiet Shift is in OFF position, only a brief 30 sec cycle will be  
observed.  
If it is desirable to observe a complete defrost in warmer weather,  
the thermostat must be closed as follows:  
1. Turn off power to outdoor unit.  
CESO130076–00  
2. Disconnect outdoor fan motor lead from OF2 on control board  
(See Fig. 9.) Tape to prevent grounding.  
Speedup  
Pins  
Quiet  
Shift  
Defrost interval  
DIP switches  
A99442  
3. Restart unit in heating mode, allowing frost to accumulate on  
outdoor coil.  
Fig. 9Defrost Control  
CARE AND MAINTENANCE  
4. After a few minutes in heating mode, liquid line temperature  
should drop below closing point of defrost thermostat (ap-  
proximately 30°F).  
For continuing high performance and to minimize possible equip-  
ment failure, periodic maintenance must be performed on this  
equipment.  
NOTE: Unit will remain in defrost until defrost thermostat  
reopens at approximately 80°F coil temperature at liquid line or  
remainder of defrost cycle time.  
Leave Users Manual with owner. Explain system operation and  
periodic maintenance requirements outlined in manual. Frequency  
of maintenance may vary depending upon geographic areas, such  
as coastal applications.  
5. Turn off power to outdoor and reconnect fan motor lead to  
OF2 on control board after above forced defrost cycle.  
7
 
Copyright 2002 CARRIER Corp. 7310 W. Morris St. Indianapolis, IN 46231  
38ycxc3si  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 5a 5a  
1
4
PC 101  
Catalog No. 003-880  
Printed in U.S.A.  
Form 38YCX-C3SI  
Pg 8  
2-02  
Replaces: 38YCX-C2SI  
 

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