Carrier 38AYB, 38YCB-P, 38BYB User Manual
Model Specific Instructions
NOTE: Read the entire instruction manual before starting the
installation. Refer to Split-System Heat Pump Common Installation and Start-Up Practices (included in this packet).
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 National
Electrical Code (NEC) for special requirements.
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 the signal word DANGER, WARNING, or 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.
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. Electrical shock can
cause personal injury or death.
38YCB(P), 38AYB, 38BYB
Split-System
Heat Pump
C
3
⁄8″D. (9.53) TIEDOWN
A
.
UNIT SIZE
38YCB(P)018-030
38AYB018
38BYB018
38YCB(P)036-060
38AYB024-060
38BYB024-060
B
MIN. PAD
DIM. (IN.)
22-1/2 X 22-1/2 3-11/16 18-1/8 14-3/8
30 X 30 6-1/2 23-1/2 20
Fig. 1—Mount Unit to Pad
3. Remove lock nut and ferrule from plastic bag taped to service
panel. (See Fig. 4.) Remove the lock nut and ferrule from
liquid service valve adapter. (See Fig. 3.)
KNOCKOUTS (2) PLACES
TIEDOWN KNOCKOUT
LOCATIONS
A
(In.)
B
(In.)C(In.)
A94199
INSTALLATION
Step 1—Mount Unit to Pad
Refer to Fig. 1 for pad dimensions and dimensions needed to
mount unit to pad.
Step 2—Refrigerant Tubing
Refer to Fig. 2 for refrigerant tube dimensions and connections.
Step 3—Mechanical Connection (38YCP Model)
1. Remove plastic retainer holding outdoor piston and piston
retainer in the liquid service valve. Connect and tighten the
liquid service valve adapter to the valve body prior to
assembling ferrule/lock nut. (See Fig. 3.)
2. Cut tubing to the correct length, deburr and size as necessary,
making sure tube ends are square. If a large burr is evident, the
ID and OD must be deburred to allow the tube to bottom in
valve.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 5a 5a
PC 101 Catalog No. 563-809 Printed in U.S.A. Form 38YCB-2SI Pg 1 6-96 Replaces: 38YCB-1SI
If undersized, damaged, or elliptically shaped tubing is used
when making connection, leaks could result.
4. Slide the lock nut and ferrule onto each tube. (See Fig. 5.)
5. Apply a few drops of refrigerant oil to the ferrule and valve
threads and adapter threads to reduce assembly torque and
assist sealing.
6. Insert tube end into the service valve or adapter until it
bottoms.
7. Push the ferrule into place and hand tighten the nut until an
increase in torque is felt.
8. Mark the nut and tube and tighten 1-1/2 turns from the mark.
(See Fig. 6.) Keep the tube bottomed in the valve and adapter
while tightening nut.
AIR DISCHARGE
FIELD POWER
SUPPLY CONN
7
⁄8″ DIA HOLE WITH
1 1⁄8″ DIA KNOCKOUT
AND
1 3⁄8″ DIA
KNOCKOUT
VALVE FITTING
FERRULE
FIELD CONTROL
SUPPLY CONN
7
SUCTION LINE CONN
LIQUID LINE CONN
UNIT SIZE
018, 024 3/8 3/8 5/8 5/8
030, 036 3/8 3/8 3/4 3/4
042, 048 3/8 3/8 7/8 7/8
060 3/8 3/8 7/8 1-1/8
Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50
ft, consult your local distributor.
LIQUID TUBE VAPOR TUBE
Conn Dia Tube Dia Conn Dia Tube Dia
⁄8″ DIA HOLE
A93578
Fig. 2—Refrigerant Tube Dimensions/Connections
PISTON BODY
PISTON
PISTON RETAINER
LIQUID SERVICE
VALVE ADAPTER
FERRULE
LOCK NUT
A92120
Fig. 4—Suction Service Valve with Mechanical
Adapter (38YCP Model)
FERRULE LOCK NUT
TUBING
A92121
Fig. 5—Lock Nut/Ferrule Positioning
4. Close suction service valve and recover refrigerant in tubing.
5. Back-off locknut and ferrule onto tube.
6. Remove damaged part of tubing using tubing cutter. Repeat
installation procedure previously outlined using new ferrule.
7. Evacuate tubing set and indoor coil. Check for leaks.
8. Open service valves or recharge unit. Check refrigerant
charge.
LOCK NUT
LOCK NUT
A94030
Fig. 3—Liquid Service Valve Mechanical Fitting
Assembly (38YCP Model)
NOTE: A backup wrench on the hex part of the suction valve
fitting is required while tightening.
The tube end must stay bottomed in the service valve during
final assembly to ensure proper seating, sealing, and rigidity.
MECHANICAL FITTING REPAIR
To replace damaged ferrule or tubing, proceed as follows.
1. Attach gages to service valves.
2. Close liquid service valve and operate unit in cooling mode to
pump refrigerant charge into condenser coil.
3. When suction pressure reaches 5 psig, shut unit off. Do not
operate unit in a vacuum.
TUBING
MARK ON LOCK NUT
AND TUBE
A92122
Fig. 6—Proper Marking of Valve Assembly
2
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