Carrier Heat Pump 38AYB User Manual

38YCB(P), 38AYB, 38BYB  
Split-System  
Heat Pump  
Model Specific Instructions  
NOTE: Read the entire instruction manual before starting the  
installation. Refer to Split-System Heat Pump Common Installa-  
tion 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.  
C
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  
Electrical Code (NEC) for special requirements.  
3
D. (9.53) TIEDOWN  
8
KNOCKOUTS (2) PLACES  
A
B
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.  
A94199  
TIEDOWN KNOCKOUT  
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.  
LOCATIONS  
MIN. PAD  
DIM. (IN.)  
UNIT SIZE  
A
(In.)  
B
(In.)  
C
(In.)  
38YCB(P)018-030  
38AYB018  
22-1/2 X 22-1/2 3-11/16 18-1/8 14-3/8  
38BYB018  
38YCB(P)036-060  
38AYB024-060  
38BYB024-060  
30 X 30  
6-1/2  
23-1/2  
20  
Fig. 1—Mount Unit to Pad  
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.  
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.)  
INSTALLATION  
Step 1—Mount Unit to Pad  
If undersized, damaged, or elliptically shaped tubing is used  
when making connection, leaks could result.  
Refer to Fig. 1 for pad dimensions and dimensions needed to  
mount unit to pad.  
4. Slide the lock nut and ferrule onto each tube. (See Fig. 5.)  
Step 2—Refrigerant Tubing  
5. Apply a few drops of refrigerant oil to the ferrule and valve  
threads and adapter threads to reduce assembly torque and  
assist sealing.  
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.)  
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.  
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.  
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.  
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. 563-809  
Printed in U.S.A.  
Form 38YCB-2SI  
Pg 1  
6-96  
Replaces: 38YCB-1SI  
 
NOTE: A thermostatic expansion valve (TXV) is required on all  
38BYB units. Step 4 refers to the installation of the TXV.  
10 O'CLOCK  
2 O'CLOCK  
SENSING BULB  
Step 4—Remove Indoor AccuRater® Piston and Install  
TXV  
STRAP  
For proper unit operation and reliability, units must be  
installed with a field-supplied hard shut-off TXV. Do not  
install with evaporator coils having capillary tube metering  
devices or piston.  
SUCTION TUBE  
8 O'CLOCK  
78 IN. OD & SMALLER  
4 O'CLOCK  
LARGER THAN 78 IN. OD  
After removing existing AccuRater from indoor coil, install  
field-supplied bi-flow hard shut-off TXV kit. (See Fig. 7 and 8.)  
A81032  
Fig. 8—Positioning of Sensing Bulb  
For TXV kit part number and charging instruction, refer to TXV  
label in your unit. If the indoor unit (fan coil) comes factory  
equipped with a bi-flow hard shut-off TXV, no TXV change is  
required.  
COIL  
SENSING  
BULB  
EQUALIZER  
TUBE  
Install TXV kit to indoor coil as follows:  
1. Install suction tube adapter.  
2. Install liquid flare-to-sweat adapter.  
3. Connect external equalizer tube to fitting on suction tube  
adapter.  
THERMOSTATIC  
EXPANSION  
VALVE  
4. Position sensing bulb on horizontal portion of suction tube  
adapter. Secure using supplied hardware.  
5. Insulate bulb after installation. (See Fig. 8.)  
6. Leak check all connections.  
A88382  
Fig. 7—Typical TXV Installation  
3
 
SERVICE TRAINING  
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 is available, using popular  
video-based formats and materials. All include video and/or slides, plus companion  
book.  
Classroom Service Training plus "hands-on" the products in our labs can mean  
increased confidence that really pays dividends in faster troubleshooting, fewer  
callbacks. Course descriptions and schedules are in our catalog.  
CALL FOR FREE CATALOG 1-800-962-9212  
[ ] Packaged Service Training  
[ ] Classroom Service Training  
A94328  
Copyright 1996 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231  
38ycb2si  
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. 563-809  
Printed in U.S.A.  
Form 38YCB-2SI  
Pg 4  
6-96  
Replaces: 38YCB-1SI  
 

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