Bryant 550A Instruction Manual download pdf (Page 3)

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 factory-installed piston. Be sure teflon

seal is in place.

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

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 1/4-in. male connector for attaching equalizer tube.

7. Connect equalizer tube of TXV to 1/4-in. equalizer fitting

on vapor line adapter.

8. Attach TXV bulb to horizontal section of suction line using

clamps provided. Insulate bulb with field-supplied insula-

tion tape. See Fig. 5 for correct positioning of sensing bulb.

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.

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 Puron® 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. 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

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.

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

flow-control devices, including solenoid valves.

Fig. 4—Check-Flo-Rater® Components

(550A, 552A, 591B Only)

A01019

PISTON

RETAINER

PISTON

RING

PISTON

BODY

FLARE

ADAPTER

STRAINER

FIELD

CONNECTION

LIQUID LINE STRAINER

APPROX 2” LONG

STRAINER LABEL

(AFFIX TO LIQ. LINE

NEAR STRAINER LOCATION

Fig. 5—Position of Sensing Bulb

A81032

2 O'CLOCK

10 O'CLOCK

SENSING BULB

STRAP

SUCTION TUBE

8 O'CLOCK

4 O'CLOCK

⁄

IN. OD & SMALLER

LARGER THAN

⁄

IN. OD

—3—

1 2 3 4 5 6 7 8 ... 11 12

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Bryant 550A Instruction Manual Page 3

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