38YCW
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Installation and Start-Up Instructions
NOTE: Read the entire instruction manual before starting the
installation.
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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 words DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which willresultinsevere
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. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
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(es) with a suitable warning label. Electrical shock can
cause personal injury or death.
INTRODUCTION AND RECOMMENDATIONS
NOTE: In some cases noise has been traced to improper instal-
lation of equipment.
1. Locate unit away from windows, patios, decks, and so forth
where unit operation sounds may disturb customer.
2. Ensure that vapor- and liquid-tubediametersare appropriate to
capacity of unit.
3. Run refrigerant tubes as directly as possible by avoiding
unnecessary turns and bends.
38YCW
10 SEER Split-System
Heat Pump
A98525
Fig. 1—Model 38YCW
.
4. Leave some slack between structure and unit to absorb
vibration.
5. When passing refrigerant tubes through the wall, seal opening
with RTV or other pliable silicon-based caulk. (See Fig. 2.)
6. Avoid direct refrigerant tubing contact with water pipes, duct
work, floor joists, wall studs, floors, and walls.
7. Do not suspend refrigerant tubing from joists and studs with a
rigid wire or strap that comes in direct contact with tubing.
(See Fig. 2.)
8. Ensure that refrigerant tubing insulation is pliable and completely surrounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation. (See Fig. 2.)
10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.
When outdoor unit is connected to factory-approved indoor unit,
outdoor unit contains system-refrigerant charge for operation with
indoor unit of the same size when connected by 15 ft of
field-supplied or factory-accessory tubing. For proper unit operation, check refrigerant charge using charging information located
on control-box cover and/or in the Check Charge section of this
Instruction.
IMPORTANT: Maximum liquid-line size is 5/8-in. O.D. for all
residential applications including long line applications.
IMPORTANT: Always install a liquid-line filter drier. Refer to
Product Data Digest for appropriate part number. Obtain filter
drier from your distributor or branch.
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. 533-80020 Printed in U.S.A. Form 38YCW-3SI Pg 1 2-02 Replaces: 38YCC-4SI
Avoid contact between tubing and structureNOTE:
OUTDOOR WALL INDOOR WALL
CAULK
LIQUID TUBE
C
INSULATION
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
1″ MIN.
SUSPENSION
VAPOR TUBE
JOIST
INSULATION
VAPOR TUBE
LIQUID TUBE
A94028
Fig. 2—Connecting Tubing Installation
INSTALLATION
Step 1—Check Equipment and Job Site
UNPACK UNIT
Move to final location. Remove carton, taking care not to damage
unit.
INSPECT EQUIPMENT
File claim with shipping company prior to installation if shipment
is damaged or incomplete. Locate unit-rating plate on unit-service
panel. It contains information needed to properly install unit.
Check rating plate to be sure unit matches job specifications.
3
⁄8″D. (9.53) TIEDOWN
A
KNOCKOUTS (2) PLACES
B
A94199
Dimensions (In.)
UNIT
SIZE
018–030 22-1/2 x 22-1/2 3-11/16 18-1/8 14-3/8
036–060 30 x 30 6-1/2 23-1/2 20
MINIMUM
MOUNTING-PAD
DIMENSIONS
TIEDOWN KNOCKOUT LOCATIONS
ABC
Fig. 3—Mounting Unit to Pad
Step 4—Operating Ambients
The minimum outdoor-operating ambient in cooling mode is 55°F,
and the maximum outdoor-operating ambient in cooling mode is
125°F. The maximum outdoor-operating ambient in heating mode
is 66°F.
Step 5—Elevate Unit
Step 2—Install on a Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad,
tie-down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit-mounting pattern in Fig. 3
to determine base-pan size and knockout-hole location.
On rooftop applications, mount on level platform or frame 6 in.
above roof surface. Place unit above a load-bearing wall and
isolate unit and tubing set from structure. Arrange supporting
members to adequately support unit and minimize transmission of
vibration to building. Consult local codes governing rooftop
applications.
Roof-mounted units exposed to winds above 5 mph may require
wind baffles to achieve adequate defrost. Consult Low-Ambient
Guideline for wind-baffle construction.
NOTE: Unit must be level to within ±2° (±3/8 in./ft) per
compressor manufacturer specifications.
Step 3—Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30-in. clearance to
service end of unit and 48 in. above unit. For proper airflow, a 6-in.
clearance on 1 side of unit and 12 in. on all remaining sides must
be maintained. Maintain a distance of 24 in. between units.
Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.
On rooftop applications, locate unit at least 6 in. above roof
surface.
Accumulation of water and ice in base pan may cause
equipment damage.
In areas where prolonged freezing temperatures are encountered,
elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of unit.
Step 6—Check Indoor And Outdoor AccuRater® Piston
Check indoor-coil piston to see if it matches the required piston
shown on outdoor unit-rating plate. If it does not match, replace
indoor-coil piston with piston shipped with outdoor unit. The
piston shipped with outdoor unit is correct for any approved
indoor-coil combination.
Remove indoor-coil piston if unit is to be installed on system
with a TXV-metering device.
Step 7—Check Defrost Thermostat
Check defrost thermostat to ensure it is properly located and
securely attached. There is a liquid header with a brass distributor
and feeder tube going into outdoor coil. At the end of 1 of the
feeder tubes, there is a 3/8-in. O.D. stub tube approximately 3 in.
long. The defrost thermostat should be located on stub tube. Note
that there is only 1 stub tube used with liquid header, and on most
units it is the bottom circuit.
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Table 1—Refrigerant Connections and Recommended Liquid- and Vapor-Tube Diameters (In.)
UNIT
SIZE
018, 024 3/8 3/8 3/4 3/4 3/4 3/4
030, 036 3/8 3/8 3/4 3/4 3/4 7/8
042, 048 3/8 3/8 7/8 7/8 7/8 1-1/8
060 3/8 3/8 7/8 1-1/8 7/8 1-1/8
NOTES:
1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult Long Line section of the Application Guideline.
2. Do not apply capillary-tube indoor coils to these units.
Connection Diameter Tube Diameter Connection Diameter Tube Diameter Connection Diameter Tube Diameter
LIQUID VAPOR VAPOR (LONG LINE)
Step 8—Make Piping Connections
Relieve pressure and recover all refrigerant before system
repair or final unit disposal to avoid personal injury or death.
Use all service ports and open all flow-control devices,
including solenoid valves.
If ANY refrigerant tubing is buried, provide a 6 in. vertical
rise at service valve. Refrigerant tubing lengths up to 36 in.
may be buried without further special consideration. For
lengths above 36 in., consult your local distributor.
To prevent damage to unit or service valves observe the
following:
•Use a brazing shield.
•Wrap service valves with wet cloth or use a heat-sink
material.
Outdoor units may be connected to indoor section using accessorytubing package or field-supplied refrigerant-grade tubing of correct size and condition. For tubing requirements beyond 50 ft
length or 20 ft vertical differential, substantial capacity and
performance losses can occur. Following the recommendations in
the Residential Split-System Long-Line Application Guideline
will reduce these losses. Refer to Table 1 for field-tubing diameters.
REFRIGERANT TUBING
Connect tubing to fittings on outdoor unit vapor- and liquid-
service valves. (See Table 1.) Use refrigerant-grade tubing. Refer
to appropriate section below for type of service valves installed on
unit.
SWEAT CONNECTION
non-silver-bearing brazing material. Consult local code requirements.
Refrigerant tubing and indoor coil are now ready for leak testing.
This check should include all field and factory joints.
PISTON BODY
PISTON
PISTON
RETAINER
STRAINER
SWEAT/FLARE ADAPTER
A97512
Fig. 4—Liquid-Service Valve with Sweat-Adapter
Tube
FINAL TUBING CHECK
IMPORTANT: Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure tubes are
not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
Step 9—Make Electrical Connections
To avoid valve damage while brazing, service valves must be
wrapped in a heat-sinking material such as a wet cloth.
1. Remove plastic retainer holding outdoor piston in liquidservice valve.
2. Locate adapter tube shipped with unit.
3. Install strainer in adapter tube and connect tube to service
valve. (See Fig. 4.)
4. Connect refrigerant tubing to fittings on outdoor-unit vaporand liquid-service valves.
5. Service valves are closed from factory and ready for brazing.
After wrapping service valve with a wet cloth, tubing set can
be brazed to service valve using either silver-bearing or
To avoid personal injury or death, do not supply power to unit
with compressor terminal-box cover removed.
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit-rating plate. Contact local power company for correction of
improper voltage. See unit-rating plate for recommended circuitprotection device.
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit-rating plate. Do not
install unit in system where voltage or phase imbalance (3 phase)
may fluctuate above or below permissible limits.
NOTE: Use copper wire only between disconnect switch and
unit.
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