SENSING BULB
SENSING
BULB
EQUALIZER
THERMOSTATIC
EXPANSION
VALVE
Fig. 4_Typical TXV Installation
Step 5--Elevate Unit
A81277
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.
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:RL 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 (:OILS
If TXV installation is required, remove existing AccuRateffK" from
indoor coi!. Refer to Fig. 4 and 5 and install TXV kit (specifically
designed for PuronJ_0 as follows:
i. 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,:P_, no TXV
change is required.
If _an coil is not designed for Puron_, a Puron(P_ TXV installation
is required. Refer to TXV kit Installation Instructions for details on
TXV installation.
r_ |','!:I-']," 11_
Step 7--Check Defrost Thermostat
Check defrost thermostat to ensure it is properly located and
secnrely attached. There is a liquid header with a brass distributor
8 O'CLOCK 4 O'CLOCK
A00399
Fig. 5--Positioning of Sensing Bulb
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 themlostat 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 refiigerant piping an'angements with equivalent lengths
greater than 50 fl and.or when elevation difference between indoor
and outdoor unit is greater than ± 20 fl, 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.
FEEDER TUBE
TUBE
DEFROST
THERMOSTAT
A97517
Fig. 6--Defrost Thermostat Location
If required by Long-Line Application Guideline, install LSV kit
part No. KHALS0401LLS specifically designed for Puron_K Heat
Pump. LSV should be installed within 2 ft of the outdoor unit with
flow an'ow pointing toward outdoor unit, as close as possible to
filter drier. Follow the Installation Instructions 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 selwice ports and open all flow-control devices,
including solenoid valves.
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