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INSTALLING TXV IN PLACE OF PISTON
1. Remove any existing refrigerant and ensure coil has not
been exposed to atmospheric pressure for more than 15
minutes.
2. Remove indoor coil inlet tube at piston body inlet. Use
back-up wrench to prevent damage.
3. Remove piston retainer, begin careful not to damage scaling
surface of O-ring.
4. Remove and discard factory-installed piston. (Replace re-
tainer if O-ring is damaged.)
5. Reinstall piston retainer in piston body.
6. Replace indoor coil inlet tube. Use back-up wrench to
prevent damage.
CAUTION: To prevent damage to the unit, use a brazing
shield and wrap TXV with wet cloth.
7. Sweat swivel adapter (see Fig. 5D) to inlet of indoor coil
and attach to TXV (see Fig. 5A) outlet. Use backup wrench
to avoid damage to tubing or valve. Sweat Inlet of TXV,
marked “IN” to liquid line. Avoid excessive heat which
could damage valve
8. Install vapor elbow (see Fig. 5B) with equalizer adapter to
suction tube of line set and suction connection to indoor
coil. Adapter has a 1/4-in. male connector or attaching
equalizer tube.
9. Connect equalizer tube of TXV to 1/4-in. equalizer fitting
on vapor line adapter.
10. Attach TXV bulb to horizontal section of suction line using
bulb straps provided. (See Fig. 5C.) Insulate bulb with
factory-supplied insulation tape. (See Fig. 5E.) See Fig. 6
for correct positioning of sensing bulb.
11. Proceed with remainder of unit installation.
REPLACING R-22 TXV OR NON-BALANCE PORT
PURON TXV
1. Remove any existing refrigerant and ensure coil has not
been exposed to atmospheric pressure for more than 15
minutes.
2. Remove coil access panel and fitting panel from front of
cabinet.
3. Remove TXV support clamp using the 5/16-in. nut driver.
Save the clamp.
4. Remove TXV using a backup wrench on flare connections
to prevent damage to tubing.
5. Using wire cutters, cut equalizer tube off flush with vapor
tube inside cabinet.
6. Remove bulb from vapor tube inside cabinet.
7. Braze equalizer stub-tube closed. Use protective barrier as
necessary to prevent damage to drain pan.
IMPORTANT: Route the equalizer tube of approved Puron®
TXV through suction line connection opening in fitting panel prior
to replacing fitting panel around tubing.
8. Install TXV with 3/8-in. copper tubing through small hole
in service panel. (See Fig. 5A.) To avoid damage to tubing
or valve, use wrench and backup wrench to attach TXV to
distributor.
9. Reinstall TXV support clamp (removed in item 3).
10. Attach TXV bulb to vapor tube inside cabinet, in same
location as original was when removed, using supplied bulb
strap. (See Fig. 5C.) See Fig. 6 for correct positioning of
sensing bulb.
11. Route equalizer tube through suction connection opening
(large hole) in fitting panel and install fitting panel in place.
12. Sweat inlet of TXV, marked “IN” to liquid line. Avoid
excessive heat which could damage valve.
13. Install vapor elbow with equalizer adapter to vapor line of
line set and vapor connection to indoor coil. (See Fig. 5B.)
Adapter has a 1/4-in. male connector for attaching equalizer
tube. (See Fig. 5B.)
14. Connect equalizer tube of TXV by 1/4-in. equalizer fitting,
on vapor line adapter. Use backup wrench to prevent
damage to equalizer fitting.
15. Proceed with the remainder of unit installation.
B. LONG-LINE APPLICATIONS
For refrigerant piping arrangements with equivalent lengths
greater than 50 ft or when elevation difference between indoor
and/or outdoor unit is more 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.
VI. MAKE 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.
Fig. 5—TXV Kit Contents
A01418
A
B
D
INLET
COIL
E
BULB
INSULATION
TAPE
C
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