Bryant R-22 Make Piping Connections, Replacing TXV on an Indoor Coil pre-2006, Unit Damage Hazard

Replacing TXV on an Indoor Coil (pre-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.

4.Remove R-22 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 TXV through suction line connection opening in fitting panel prior to replacing fitting panel around tubing.

8.Install TXV with 3/8-in. copper tubing through small hole in service panel. Use wrench and backup wrench, to avoid damage to tubing or valve, to attach TXV to distributor.

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. 25 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 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. 25 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

!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.

COIL

SENSING

BULB

EQUALIZER

TUBE

THERMOSTATIC

EXPANSION

VALVE

A91277

Fig. 26 – Typical TXV Installation

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