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).
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.
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 instal-
lation 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 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 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.
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. Elec-
trical shock can cause personal injury or death.
INSTALLATION
Step 1—Mounting Pad
Refer to Table 1 for mounting pad dimensions.
Step 2—Refrigerant Tubing
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.
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.)
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.
Fig. 1—Unit Connections A93578
LIQUID LINE CONN
FIELD CONTROL
SUPPLY CONN
7⁄8″ DIA HOLE
FIELD POWER
SUPPLY CONN
7⁄8″ DIA HOLE WITH
1 1⁄8″ DIA KNOCKOUT
AND 1 3⁄8″ DIA
KNOCKOUT
AIR DISCHARGE
SUCTION LINE CONN
Table 1—Mounting Pad Dimensions
UNIT SIZE MINIMUM DIMENSIONS (IN.)
018-030 22-1/2 x 22-1/2
036-060 30 x 30
Table 2—Refrigerant Connections and
Recommended Liquid and Vapor Tube Diameters
(In.)
UNIT
SIZE
LIQUID VAPOR
Connect
Diameter Tube
Diameter Connect
Diameter Tube
Diameter
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
Note: Tube diameters are for lengths up to 50 ft. For tubing lengths greater
than 50 ft, consult your local distributor.
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. 563-733 Printed in U.S.A. Form 38YCA-3SI Pg 1 2-94 Replaces: 38YCA-2SI
