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 the unit. Fig. 4 shows unit with accessory support feet
installed. Use accessory snow stand in areas where prolonged
freezing temperatures are encountered. Refer to separate Installa-
tion Instructions packaged with accessories.
Step 6—Check Indoor Expansion Device
For proper unit operation and reliability, units must be
installed with factory-supplied balanced port hard shutoff
TXV specifically designed to operate with Puron® two-speed
unit. Do not install with evaporator coils having capillary tube
metering devices.
FURNACE COILS
Remove existing AccuRater piston from indoor coil and install
factory-supplied TXV.
IMPORTANT: The TXV should be mounted as close to the
indoor coil as possible and in a vertical, upright position. Avoid
mounting the inlet tube vertically down. Valve is more susceptible
to malfunction due to debris if inlet tube is facing down. A
factory-approved filter drier must be installed in the liquid line.
Install TXV kit to indoor coil as follows:
PROCEDURE 1—INSTALLING TXV IN PLACE OF
PISTON
1. Pump system down to 2 psig and recover refrigerant.
2. Remove indoor coil inlet tube at piston body inlet. Use
back-up wrench to prevent damage.
3. Remove piston retainer, being careful not to damage sealing
surface of O-ring.
4. Remove and discard factory-installed piston. Replace retainer
if O-ring is damaged.
NOTE: If the piston is not removed from the body, TXV will not
function properly.
5. Reinstall piston retainer in piston body.
6. Replace indoor coil inlet tube. Use back-up wrench to prevent
damage.
To prevent damage to the unit, use a brazing shiled and wrap
TXV with wet cloth or use heat sink material.
7. Sweat swivel adapter (See Fig. 6D) to inlet of indoor coil and
attach to TXV (See Fig. 6A) outlet. Use backup wrench to
avoid damage to tubing or valve. Sweat inlet of TXV, marked
“IN,” to liquid line. Avoid excesive heat which could damage
valve.
8. Install vapor elbow (See Fig. 6B) with equalizer adapter to
suction tube of line set and suction connection to indoor coil.
Adapter has a 1/4-in. male flare connector for 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
nylon bulb clamps provided. (See Fig. 6C.) Insulate bulb with
field-supplied insulation tape. See Fig. 7 for correct position-
ing of sensing bulb.
11. Proceed with remainder of unit installation.
FAN COILS
Indoor unit (fan coil) does NOT contain a balanced port hard
shut-off TXV specifically designed for Puron® two-speed TXV.
Changeout is required.
PROCEDURE 2—REPLACING R-22 TXV OR NON-
BALANCED PORT PURON® TXV OR INDOOR COIL
1. Pump system down to 2 psig and recover refrigerant.
2. Remove coil access panel and fitting door from cabinet.
3. Remove and save TXV support clamp using a 5/16-in. nut
driver.
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 factory
supplied Puron® TXV through suction line connection opening in
fitting panel prior to replacing fitting panel around tubing.
8. Install TXV (Fig. 6A) with 3/8-in. copper inlet tube through
small hole in service panel. Use wrench and backup wrench,
to avoid damage to tubing valve.
9. Reinstall TXV support clamp (removed in item 3).
10. Attach TXV bulb to vapor tube inside cabinet in same location
as original was removed using supplied nylon bulb clamps
(See Fig. 6C). See Fig. 7 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 (See Fig. 6B) with equalizer adapter to
vapor line of line set and vapor connection to indoor coil.
Adapter has a 1/4-in. male flare connector for attaching
equalizer tube. (See Fig. 6B.)
14. Connect equalizer tube of TXV to 1/4-in. equalizer fitting on
vapor line adapter. Use backup wrench to prevent damage to
equalizer fitting.
Fig. 5—TXV Installed
A00426
THERMOSTATIC
EXPANSION
VALVE
EQUALIZER
TUBE
COIL
SENSING
BULB
3
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