INSTALLING TXV IN PLACE OF PISTON
1.Pump system down to 2 psig and recover refrigerant.
2.Remove hex nut from piston body. Use backup wrench on fan coils.
3.Remove and discard
4.Reinstall hex nut. Finger tighten nut plus 1/2 turn.
NOTE: If the piston is not removed from the body, TXV will not function properly.
CAUTION: To prevent damage to the unit, use a brazing shield and wrap TXV with wet cloth or use heat sink
10 O'CLOCK
2 O'CLOCK
STRAP |
SUCTION TUBE
8 O'CLOCK
7⁄8 IN. OD & SMALLER
SENSING BULB
4O'CLOCK
LARGER THAN 7⁄8 IN. OD
material.
5.Install TXV on indoor coil liquid line. Sweat swivel adapter to inlet of indoor coil and attach to TXV 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.
6.Install vapor elbow with equalizer adapter to suction tube of line set and suction connection to indoor coil. Adapter has a
7.Connect equalizer tube of TXV to
8.Attach TXV bulb to horizontal section of suction line using clamps provided. Insulate bulb with
9.Proceed with remainder of unit installation.
REPLACING TXV ON R-22 INDOOR COIL
1.Pump system down to 2 psig and recover refrigerant.
2.Remove coil access panel and fitting panel from front of cabinet.
PISTON
RETAINER
PISTON
RING
PISTON
PISTON
BODY
FIELD
CONNECTION
STRAINER
FLARE
ADAPTER
LIQUID LINE STRAINER
APPROX 2” LONG
STRAINER LABEL
(AFFIX TO LIQ. LINE
NEAR STRAINER LOCATION
A01019
Fig.
A81032
Fig. 5—Position of Sensing Bulb
3.Remove TXV support clamp using a
4.Remove
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 Puron® TXV through suction line connection opening in fitting panel prior to replacing fitting panel around tubing.
8.Install TXV 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 when removed, using supplied bulb clamps (nylon or copper). See Fig. 5 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. Adapter has a
14.Connect equalizer tube of TXV to
15.Proceed with remainder of unit installation.
CAUTION: To avoid improper performance and pos- sible equipment failure, remove indoor coil piston if unit is to be installed on system with a TXV metering device.
VII. 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