Service Manual

27
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 insulation tape. See Fig. 23 for correct
positioning of sensing bulb.
9. Proceed with remainder of unit installation.
2O’CLOCK
10 O’CLOCK
SENSING BULB
STRAP
SUCTION TUBE
A08083
Fig. 23 – Position of Sensing Bulb
1. Pump system down to 2 psig, if possible, 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 c onnection 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. 23
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, if possible, 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.
Replacing TXV on an Indoor Coil
(pre- 2006)
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. 23
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.
ELECTRICAL OPERATION 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
!