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Fig. 4—Typical TXV Installation
VI. CHECK INDOOR EXPANSION DEVICE
CAUTION: 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.
A. Furnace Coils
If indoor unit (furnace coil) comes factory equipped with a bi-flow
hard shutoff TXV specifically designed for Puron®, no TXV
change is required. If TXV installation is required, remove existing
Check-Flo-Rater® 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.
B. 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.
VII. 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.
VIII. 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
Service Manual for Residential Split-System Air Conditioners and
Heat Pumps Using Puron® Refrigerant.
COIL
SENSING
BULB
EQUALIZER
TUBE
THERMOSTATIC
EXPANSION
VALVE
A91277
8 O'CLOCK
Fig. 5—Positioning of Sensing Bulb
If required by Long-Line Application Guideline, install LSV kit
part No. KHALS0401LLS specifically designed for Puron® Heat
Pump. LSV should be installed within 2 ft of the outdoor unit with
arrow pointing toward outdoor unit, as close as possible to filter
drier. Follow the Installation Instructions included with accessory
kit.
IX. MAKING PIPING CONNECTIONS
WARNING: 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.
CAUTION: Do not leave system open to atmosphere
any longer than minimum required for installation. POE
oil in compressor is extremely susceptible to moisture
absorption. Always keep ends of tubing sealed during
installation.
CAUTION: 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.
CAUTION: 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, substan-
tial capacity and performance losses can occur. Follow the
recommendations in the Application Guideline and Service
Manual for Residential Split-System Air Conditioners and Heat
Pumps using Puron® Refrigerant to minimize losses. Refer to
Table 1 for field tubing diameters. Refer to Table 2 for accessory
requirements.
Refrigerant tubes and indoor coil must be evacuated to 500
microns to minimize contamination and moisture in the system.
—3—
SENSING BULB
STRAP
4 O'CLOCK
A00399
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