Residential Air Conditioners and Heat Pumps Using R-22 and Puron® Refrigerant: Application Guideline and Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
32
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 1/4-in. male
connector for attaching equalizer tube.
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.
15. Proceed with remainder of unit installation.
Replacing TXV on Indoor Coil (post-2006)
1. Pump system down to 2 psig and recover refrigerant.
2. Remove coil access panel and fitting panel from front of cabinet.
3. Remove TXV support clamp using a 5/16-in. nut driver. Save the
clamp (N coils only).
4. Remove TXV using a backup wrench on connections to prevent
damage to tubing.
5. Remove equalizer tube from suction line of coil.
Note: Some coils may have a mechanical connection. If coil has a
braze connection, use file or tubing cutter to cut brazed equalizer
line approximately 2 inches above suction tube.
6. Remove bulb from vapor tube inside cabinet.
7. Install the new TXV using a wrench and backup wrench to avoid
damage to tubing or valve to attach TXV to distributor.
8. Reinstall TXV support clamp (removed in item 3). (N coils only.)
9. Attach equalizer tube to suction line. If coil has mechanical
connection, then use wrench and back up wrench to attach. If coil
has brazed connection, use file or tubing cutters to remove
mechanical flare nut from equalizer line. Then use coupling to
braze the equalizer line to stub (previous equalizer line) in suction
line.
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. 27 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. Proceed with remainder of unit installation.
Make Piping Connections
A91277
Fig. 28 – Typical TXV Installation
WARNING
!
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in personal injury or death.
Relieve pressure and recover all refrigerant before system repair or
final unit disposal.
Use all service ports and open all flow-control devices, including
solenoid valves.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation.
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.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation.
If ANY refrigerant tubing is buried, provide a 6 in. vertical rise at
service valve. Refrigerant tubing lengths up to 36 in. may be buried
without further special consideration. Do not bury lines longer than 36
in.
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