Step 6—Remove Indoor AccuRater® Piston and Install
TXV
For proper unit operation and reliability, units must be
installed with field-supplied hard shutoff 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. 5 and 6 and install TXV kit 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. 6.)
6. Leak check all connections.
FAN COILS
If indoor unit (fan coil) comes factory equipped with a bi-flow
hard shutoff TXV, no TXV change is required.
Refer to TXV kit Installation Instructions for details on TXV
installation.
Step 7—Check Outdoor AccuRater® Piston
Check outdoor unit piston. Remove retainer on liquid service valve
and check piston size with matching number listed on outdoor unit
rating plate.
Step 8—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. (See Fig. 7.) 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 9—Install Liquid-Line Solenoid Valve
(LSV)—Optional
Heating efficiency (HSPF) can be improved by the addition of a
LSV. Refer to presale literature for rating enhancement. Install
LSV per Installation Instructions included with accessory kit.
NOTE: To enhance heating HSPF, flow arrow must point toward
outdoor coil.
Step 10—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.
Fig. 5—Typical TXV Installation
A88382
THERMOSTATIC
EXPANSION
VALVE
EQUALIZER
TUBE
SENSING
BULB
COIL
Fig. 6—Positioning of Sensing Bulb
A81032
2 O'CLOCK
10 O'CLOCK
SENSING BULB
STRAP
SUCTION TUBE
8 O'CLOCK
4 O'CLOCK
7
⁄
8
IN. OD & SMALLER
LARGER THAN
7
⁄
8
IN. OD
Fig. 7—Defrost Thermostat Location
A97517
FEEDER TUBE
DEFROST
THERMOSTAT
STUB TUBE
3
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