38YCX—50 Hz Heat Pump—Outdoor Section
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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 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 electric codes 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 words DANGER, WARNING, and 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. 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 with a suitable warning label. Electrical shock can cause personal injury or death.
INSTALLATION
Step 1—Check Equipment and Job Site
UNPACK UNIT — Move to final location. Remove carton taking care not to damage unit.
IP24
A97005
Fig. 1—Model 38YCX
When installing, allow sufficient space for airflow clearance, wiring, refrigerant piping, and service. Allow 30-in. (762mm) clearance to service end of unit and 48 in. (1219mm) above unit. For proper airflow, a 6-in. (152mm) clearance on 1 side of unit and 12 in. (305mm) on all remaining sides must be maintained. Maintain a distance of 24 in. (610mm) 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. (152mm) 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.
Step 3—Elevate Unit
INSPECT EQUIPMENT — File claim with shipping company prior to installation if shipment is damaged or incomplete. Locate unit rating plate on unit corner panel. (See Fig. 2.) It contains information needed to properly install unit. Check rating plate to be sure unit matches job specifications.
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. 2 to determine base pan size and knockout hole location.
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. (See Fig. 3.)
Step 4—Replace Indoor AccuRater® Piston (if required)
Check indoor coil piston to see if it matches the required piston shown on outdoor unit rating plate. (See Fig. 2.) If it does not
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. 003-880 |
Printed in U.S.A. |
Form 38YCX-C3SI |
Pg 1 |
2-02 |
Replaces: 38YCX-C2SI |
Tab |
5a |
5a |
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NOTES:
1.ALLOW 30″ CLEARANCE TO SERVICE END OF UNIT, 48″ ABOVE UNIT, 6″ ON ONE SIDE, 12″ ON REMAINING SIDE, AND 24″ BETWEEN UNITS FOR PROPER AIRFLOW.
2.MINIMUM OUTDOOR OPERATING AMBIENT IN COOLING MODE IS 55° F (UNLESS LOW AMBIENT CONTROL IS USED) MAX. 115° F.
3.MAXIMUM OUTDOOR OPERATING AMBIENT IN HEATING MODE IS 66° F.
4.SERIES DESIGNATION IS THE 13TH POSITION OF THE UNIT MODEL NUMBER.
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A |
AIR DISCHARGE |
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AIR IN |
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AIR |
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DISCHARGE |
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E |
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AIR |
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IN |
G |
AIR IN |
B |
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AIR |
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DISCHARGE |
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C |
AIR IN |
F DIA SUCTION LINE CONN |
3/8″ DIA LIQUID LINE CONN |
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D
FIELD POWER
SUPPLY CONN
7/8″ DIA HOLE WITH
1 1/8″ DIA KNOCKOUT AND 1 3/8″ DIA KNOCKOUT
FIELD CONTROL SUPPLY CONN 7/8″ DIA HOLE
A97004
UNIT |
A/B |
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C |
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D |
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E |
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F |
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G |
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SIZE |
In. |
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mm |
In. |
mm |
In. |
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mm |
In. |
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mm |
In. |
mm |
In. |
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mm |
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024 |
22-1/2 |
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571.5 |
3-11/16 |
93.6 |
18-1/8 |
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460.4 |
14-3/8 |
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365.1 |
5/8 |
15.88 |
33-15/16 |
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862.0 |
036 |
30 |
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762.0 |
6-1/2 |
165.1 |
23-1/2 |
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596.9 |
20 |
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508.0 |
3/4 |
19.05 |
39-15/16 |
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1014.4 |
048 |
30 |
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762.0 |
6-1/2 |
165.1 |
23-1/2 |
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596.9 |
20 |
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508.0 |
7/8 |
22.23 |
33-15/16 |
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862.0 |
060 |
30 |
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762.0 |
6-1/2 |
165.1 |
23-1/2 |
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596.9 |
20 |
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508.0 |
7/8 |
22.23 |
33-15/16 |
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862.0 |
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Fig. 2—Unit Reference Drawing
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.
Do not operate unit in the vicinity of toxic or flammable material. Failure to follow this warning can result in personal injury, fire, or death.
Remove indoor coil piston if unit is to be installed on system with a TXV metering device.
Step 5—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.
SERVICE
ACCESS
A97006
Fig. 3—Accessory Heat Pump Feet
2
Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters
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LIQUID |
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VAPOR |
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UNIT SIZE |
Connection Dia. |
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Tube Dia. |
Connection DIia. |
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Vapor Dia. |
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In. |
mm |
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In. |
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mm |
In. |
mm |
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In. |
mm |
024 |
3/8 |
9.53 |
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3/8 |
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9.53 |
5/8 |
15.88 |
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5/8 |
15.88 |
036 |
3/8 |
9.53 |
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3/8 |
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9.53 |
3/4 |
19.05 |
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3/4 |
19.05 |
048 |
3/8 |
9.53 |
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3/8 |
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9.53 |
7/8 |
22.23 |
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7/8 |
22.23 |
060 |
3/8 |
9.53 |
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3/8 |
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9.53 |
7/8 |
22.23 |
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1-1/8 |
28.58 |
NOTES: 1. Tube diameters are for lengths up to 50 ft (15.24m). For tubing lengths greater than 50 ft (15.24m), consult Long-Line Application Guideline. 2. Do not apply capillary tube indoor coils to these units.
To prevent compressor damage DO NOT bury more than 36 in. of refrigerant tubing. If ANY tubing is buried, provide 6 in. vertical rise at service valve.
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 accessory tubing package or field-supplied refrigerant grade tubing of correct size and condition. For tubing requirements beyond 50 ft (15.24m), consult Long-Line Application Guideline which is available from your local distributor.
NOTE: In some cases noise in the living area has been traced to gas pulsations from improper installation of equipment.
INSTALLATION RECOMMENDATIONS
1.Locate unit away from windows.
2.Ensure that vapor and liquid tube diameters are appropriate to capacity of unit. (See Table 1.)
3.Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends.
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. 4.)
6.Avoid direct tubing contact with water pipes, ductwork, floor joists, wall studs, floors, and walls.
7.Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap which comes in direct contact with tubing. (See Fig. 4.)
8.Ensure that tubing insulation is pliable and completely surrounds vapor tube.
9.When necessary, use hangar straps which are 1 in. (25mm) wide and conform to shape of tubing insulation. (See Fig. 4.)
10.Isolate hangar straps from insulation by using metal sleeves bent to conform to shape of insulation.
If refrigerant tubes or indoor coil is exposed to atmosphere, it must be evacuated to 500 microns to eliminate contamination and moisture in the system.
OUTDOOR UNIT CONNECTED TO FACTORY-APPROVED INDOOR UNIT — Outdoor unit contains correct system refrigerant charge for operation with indoor unit of same size when connected by 15 ft (4.55m) of field-supplied or factory-accessory tubing. Check refrigerant charge for maximum efficiency.
NOTE: Avoid contact between tubing and structure.
OUTDOOR WALL INDOOR WALL
CAULK
LIQUID TUBE
VAPOR TUBE
INSULATION
THROUGH THE WALL
JOIST
HANGER STRAP
(AROUND VAPOR
TUBE ONLY) INSULATION VAPOR TUBE
1″ MIN |
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(25 mm) |
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LIQUID TUBE |
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SUSPENSION |
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A94330
Fig. 4—Piping Installation
PISTON BODY
PISTON
PISTON RETAINER
SWEAT/FLARE ADAPTER
A94029
Fig. 5—Service Valve with Sweat Adapter Tube
3
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