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 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.
INSTALLATION
Step 1ÐMount Unit to Pad
Refer to Fig. 1 for pad dimensions and dimensions needed to mount unit to pad.
Step 2ÐRefrigerant Tubing
Refer to Fig. 2 for refrigerant tube dimensions and connections.
Step 3ÐMechanical 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.
C
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3⁄8″D. (9.53) TIEDOWN |
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A |
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KNOCKOUTS (2) PLACES |
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B |
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A94199 |
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TIEDOWN KNOCKOUT |
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UNIT SIZE |
MIN. PAD |
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LOCATIONS |
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DIM. (IN.) |
A |
B |
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(In.) |
(In.) |
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(In.) |
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38YCB(P)018-030 |
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38AYB018 |
22-1/2 X 22-1/2 |
3-11/16 |
18-1/8 |
14-3/8 |
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38BYB018 |
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38YCB(P)036-060 |
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38AYB024-060 |
30 X 30 |
6-1/2 |
23-1/2 |
20 |
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38BYB024-060 |
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Fig. 1ÐMount 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.)
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.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book |
1 |
4 |
PC 101 |
Catalog No. 563-809 |
Printed in U.S.A. |
Form 38YCB-2SI |
Pg 1 |
6-96 |
Replaces: 38YCB-1SI |
Tab |
5a |
5a |
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AIR DISCHARGE
FIELD POWER |
SUPPLY CONN |
7⁄8² DIA HOLE WITH |
1 1⁄8² DIA KNOCKOUT |
AND 1 3⁄8² DIA |
KNOCKOUT |
FIELD CONTROL |
SUPPLY CONN
7⁄8² DIA HOLE
SUCTION LINE CONN
LIQUID LINE CONN
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A93578 |
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UNIT SIZE |
LIQUID TUBE |
VAPOR TUBE |
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Conn Dia |
Tube Dia |
Conn Dia |
Tube Dia |
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018, 024 |
3/8 |
3/8 |
5/8 |
5/8 |
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030, 036 |
3/8 |
3/8 |
3/4 |
3/4 |
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042, 048 |
3/8 |
3/8 |
7/8 |
7/8 |
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060 |
3/8 |
3/8 |
7/8 |
1-1/8 |
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Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult your local distributor.
Fig. 2ÐRefrigerant Tube Dimensions/Connections
PISTON BODY 
PISTON
PISTON RETAINER
LIQUID SERVICE
VALVE ADAPTER
FERRULE
LOCK NUT
A94030
Fig. 3ÐLiquid 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.
VALVE FITTING
FERRULE
LOCK NUT
A92120
Fig. 4ÐSuction Service Valve with Mechanical Adapter (38YCP Model)
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FERRULE |
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LOCK NUT |
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TUBING 
A92121
Fig. 5ÐLock 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
TUBING
MARK ON LOCK NUT
AND TUBE
A92122
Fig. 6ÐProper Marking of Valve Assembly
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