Installation guide

SENSING
BULB
EQUALIZER
THERMOSTATIC
EXPANSION
VALVE
Fig. 5--TXV Installed
Step 6--Check Indoor Expansion Device
A91277
For proper unit operation and reliability, units must be
installed with balance port hard shutoff TXV specifically
designed to operate with Puron(P_ two-speed unit. Do not
install with evaporator coils having capillary robe metering
devices.
The 38YDB037 unit includes a factory supplied TXV kit. No other
size unit includes factory supplied TXV kit.
FURNACE (:OILS
Puron'_ furnace coils come _actory equipped with bi-flow, hard
shutoff TXVs specifically designed for Puron(P_ two-speed units.
No changeout is required.
Remove existing AccuRater_ piston from indoor coil and install
field accessory 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. A _actory-supplied or
approved filter &ier must be installed in the liquid line.
Install TXV kit to indoor coil as follows:
Installing TXV in Place of Piston
i. Ensure coil has not been exposed to atmospheric pressure for
more than 15 minutes.
2. Remove indoor coil inlet robe at piston body inlet. Use
back-up wrench to prevent damage.
3. Remove piston retainer, being careful not to damage sealing
surl_ace of O-ring.
4. Remove and discard _actory-installed piston. (Replace retainer
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.
r.,l [_
To prevent damage to the unit, use a brazing shield and wrap
TXV with wet cloth.
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 excessive 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 robe.
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 strap provided. (See Fig. 6C.) Insulate bulb with factory-
supplied insulation tape (See Fig. 6E). See Fig. 7 for correct
positioning of sensing bulb.
11. Proceed with remainder of unit installation.
FAN COILS
Indoor unit (_an coil) comes fiactory equipped with a bi-flow
balance port hard shut-off TXV specifically designed for Puron(P_
two-speed units. Changeout is not required.
To obtain efficiency rating fbr 38YDB037 with FV4ANB006,
fancoil TXV must be replaced with factory supplied TXV.
Replacing R-22 TXV or Non-Balance Port Puron(r_" TXV
i. Remove any existing refrigerant and ensure coil has not been
exposed to atmospheric pressure fbr more than 15 minutes.
2. Remove coil access panel and fitting door fi'om 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 mbing.
5. Using wire cutters, cut equalizer robe off flush with vapor tube
inside cabinet.
6. Remove bulb fi'om 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(P_
TXV through suction line connection opening in fitting door 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 fi'om using supplied bulb strap (See
Fig. 6C). Insulate bulb with _aetory-supplied insulation tape
(See Fig. 6E). 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 robe. (See Fig. 6B.)
14. Connect eqnalizer tube of TXV to 1/4-in. equalizer fitting on
vapor line adapter. Use backup wrench to prevent damage to
equalizer fitting.
15. Proceed with remainder of unit installation.
LONG-LINE APPLICATIONS, INSTALL LIQUID-LINE
SOLENOID VALVE (LSV)
For reliigerant piping arrangements with equivalent lengths
greater than 50 ft or when elevation difference between indoor
and.or outdoor unit is greater than ± 20 ft, follow all requirements