4
Valve is more susceptible to malfunction due to debris if inlet tube
is facing down. A factory--approved filter drier must be installed in
the liquid line.
INSTALLING TXV IN PLACE OF PIST
ON
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 TeflonR
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
!
EQUIPMENT D AMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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 o f 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 insulation
tape. See Fig. 4 for correct positioning of sensing bulb.
9. Proceed with remainder of unit installation.
2 O'CLOCK
10 O'CLOCK
SENSING BULB
STRAP
SUCTION TUBE
8 O'CLOCK
4 O'CLOCK
7
⁄
8
IN. OD & SMALLER
LARGER THAN
7
⁄
8
IN. OD
A81032
Fig. 4 -- Position of Sensing Bulb
REPLACING T XV ON R--22 INDOOR
COIL
1. Pump system down to 2 psig and recover refrigerant.
2. Rem o v e co il access p an el an d fitting pan el fro m fron t o f
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. 4 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.
A05226
Fig. 5 -- Liquid Service Valve with Sweat Adapter Tube
25HBR25HBA25HBA
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