![Fig. 5—TXV Installed](/images/new-backgrounds/33458/334585x1.webp)
COIL
SENSING
BULB
EQUALIZER
TUBE
THERMOSTATIC
EXPANSION
VALVE
A91277
Fig. 5—TXV Installed
VI. CHECK INDOOR EXPANSION DEVICE
CAUTION: For proper unit operation and reliability, units must be installed with balance port hard shutoff TXV specifically designed to operate with Puron® two- speed unit. Do not install with evaporator coils having capillary tube metering devices.
A. FURNACE COILS
Puron® furnace coils come factory equipped with
Remove existing
Install TXV kit to indoor coil as follows:
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
PROCEDURE 1—INSTALLING TXV IN PLACE OF PIS- TON
1.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
3.Remove piston retainer, being careful not to damage sealing surface of
4.Remove and discard
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
CAUTION: To prevent damage to the unit, use a brazing shield 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 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
9.Connect equalizer tube of TXV to
10.Attach TXV bulb to horizontal section of suction line using bulb strap provided. (See Fig. 6C.) Insulate bulb with
11.Proceed with remainder of unit installation.
B. FAN COILS
Indoor unit (fan coil) comes factory equipped with a
PROCEDURE
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 door from cabinet.
3.Remove and save TXV support clamp using a
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
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 (Fig. 6A) with
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 bulb straps. (See Fig. 6C.) Insulate bulb with
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
14.Connect equalizer tube of TXV to
15.Proceed with remainder of unit installation.
C.
For refrigerant 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