Carrier | 38YCN | Instruction manual | Carrier 38YCN Instruction manual

38YCA/YCN
Heat Pump
Installation and Start-Up Instructions
NOTE: Read the entire instruction manual before starting the
installation. Refer to Split-System Heat Pump Installation and
Start-Up Instructions (included in this packet).
AIR DISCHARGE
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 packaged with the kits or accessories when installing.
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 Electrical Code (NEC) 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 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 that 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.
FIELD POWER
SUPPLY CONN
7⁄8″ DIA HOLE WITH
1 1⁄8″ DIA KNOCKOUT
AND 1 3⁄8″ DIA
KNOCKOUT
FIELD CONTROL
SUPPLY CONN
SUCTION LINE CONN
LIQUID LINE CONN
A93578
Fig. 1—Unit Connections
Table 1—Mounting Pad Dimensions
UNIT SIZE
018-030
036-060
INSTALLATION
Step 1—Mounting Pad
Refer to Table 1 for mounting pad dimensions.
Step 2—Refrigerant Tubing
MINIMUM DIMENSIONS (IN.)
22-1/2 x 22-1/2
30 x 30
Table 2—Refrigerant Connections and
Recommended Liquid and Vapor Tube Diameters
(In.)
UNIT
SIZE
Before installing or servicing system, always turn off main
power to system. There may be more than 1 disconnect
switch. Turn off accessory heater power if applicable. Electrical shock can cause personal injury or death.
7⁄8″ DIA HOLE
018, 024
030, 036
042, 048
060
LIQUID
Connect
Tube
Diameter
Diameter
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
VAPOR
Connect
Tube
Diameter
Diameter
5/8
5/8
3/4
3/4
7/8
7/8
7/8
1-1/8
Note: Tube diameters are for lengths up to 50 ft. For tubing lengths greater
than 50 ft, consult your local distributor.
3. Remove lock nut and ferrule from plastic bag taped to service
panel. (See Fig. 3.) Remove the lock nut and ferrule from
liquid service valve adapter. (See Fig. 2.)
Refer to Table 2 for proper refrigerant tube diameters.
Step 3—Mechanical Connection (38YCN 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. 2.)
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.
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. 4.)
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.
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. 563-733
Printed in U.S.A.
Form 38YCA-3SI
Pg 1
2-94
Replaces: 38YCA-2SI
Tab 5a 5a
FERRULE
LOCK NUT
PISTON BODY
PISTON
TUBING
PISTON RETAINER
A92121
Fig. 4—Lock Nut/Ferrule Positioning
LIQUID SERVICE
VALVE ADAPTER
FERRULE
LOCK NUT
A94030
Fig. 2—Liquid Service Valve Mechanical Fitting
Assembly (38YCN Model)
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.
VALVE FITTING
FERRULE
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.
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
A92120
Fig. 3—Suction Service Valve with Mechanical
Adapter (38YCN Model)
LOCK NUT
7. Push the ferrule into place and 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. 5.) Keep the tube bottomed in the valve and adapter
while tightening nut.
NOTE: A backup wrench on the hex part of the suction valve
fitting is required while tightening.
TUBING
MARK ON LOCK NUT
AND TUBE
A92122
Fig. 5—Proper Marking of Valve Assembly
Copyright 1994 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231
33017c
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. 563-733
Printed in U.S.A.
Form 38YCA-3SI
Pg 2
2-94
Replaces: 38YCA-2SI
Tab 5a 5a
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