Carrier 38EYA Elevate Unit, Check Indoor Expansion Device, Check Defrost Thermostat

Step 5—Elevate Unit

Accumulation of water and ice in base pan may cause equipment damage.

Elevate unit per local climate and code requirements to provide clearance above estimated snowfall level and ensure adequate drainage of unit.

COIL

SENSING

BULB

EQUALIZER

TUBE

THERMOSTATIC

EXPANSION

VALVE

A88382

Fig. 4—Typical TXV Installation

Step 6—Check Indoor Expansion Device

For proper unit operation and reliability, units must be installed with hard shutoff TXV specifically designed to operate with Puron® . Do not use R-22 TXV. Do not install with evaporator coils having capillary tube metering devices or pistons.

For TXV kit part number and charging instructions, refer to TXV label in outdoor unit.

FURNACE COILS

If TXV installation is required, remove existing AccuRater® from indoor coil. Refer to Fig. 4 and 5 and install TXV kit (specifically designed for Puron® ) as follows:

1.Install suction tube adapter.

2.Install liquid flare-to-sweat adapter.

3.Connect external equalizer tube to fitting on suction tube adapter.

4.Position sensing bulb on horizontal portion of suction tube adapter. Secure using supplied hardware.

5.Insulate bulb after installation. (See Fig. 5.)

6.Leak check all connections.

FAN COILS

If indoor unit (fan coil) comes factory equipped with a bi-flow hard shutoff TXV specifically designed for Puron® , no TXV change is required.

If fan coil is not designed for Puron® , a Puron® TXV installation is required. Refer to TXV kit Installation Instructions for details on TXV installation.

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. OD stub tube approximately 3 in. long. (See Fig. 6.) 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.

Step 8—In Long-Line Applications, Install Liquid-Line Solenoid Valve (LSV)

For refrigerant piping arrangements with equivalent lengths greater than 50 ft or when elevation difference between indoor and outdoor unit is greater than ± 20 ft, follow all requirements of the Long-Line Guideline section in the Application Guideline and

SENSING BULB

STRAP

8 O'CLOCK 4 O'CLOCK

A00399

Fig. 5—Positioning of Sensing Bulb

FEEDER TUBE

STUB TUBE

DEFROST

THERMOSTAT

A97517

Fig. 6—Defrost Thermostat Location

Service Manual for Residential Split-System Air Conditioners and Heat Pumps Using Puron® Refrigerant.

If required by Long-Line Application Guideline, install LSV kit part No. KHALS0401LLS specifically designed for Puron® Heat Pump. LSV should be installed between filter drier and indoor coil, as close as possible to filter drier. Follow the Installation Instruc- tions included with accessory kit.

IMPORTANT: Flow arrow must point toward outdoor unit.

Step 9—Making 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.

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