14
OUTLET
INLET
PUSHRODS
DIAPHRAGM
NEEDLE
VALVE
SPRING
DISTRIBUTOR
FEEDER TUBES
CAPILLARY TUBE
COIL
BULB
EXTERNAL EQUALIZER TUBE
C12046
Fig. 18 -- Thermostatic Expansion Valve (TXV) Operation
Replacing TXV
PERSONAL INJURY HAZARD
Failure to follow this caution can result in injury to
personnel and damage to components..
Always wear approved safety glasses, work gloves
and
other
recommended
Personal
Protective
Equipment (PPE) when working with refrigerants.
CAUTION
!
1. Disconnect all AC power to unit. Use approved
lockout/tagout procedures.
2. Using gauge set approved for use with Puron
(R--410A) refrigerant, recover all refrigerant from the
system..
3. Remove TXV support clamp.
4. Disconnect the liquid line at the TXV inlet.
5. Remove the TXV from the distributor.
6. Remove equalizer tube from suction line of coil. Use
tubing cutter to cut brazed equalizer line
approximately 2--inches (50 mm) above the suction
tube.
7. Remove bulb from vapor tube above the evaporator
coil header outlet.
8. Install the new TXV avoiding damage to the tubing
or the valve when attaching the TXV to the distribut-
or. Protect the TXV against over--temperature condi-
tions y using wet rags and directing the torch flame
tip away from the TXV body. Connect the liquid line
to the TXV inlet by repeating the above process.
9. Route equalizer tube through suction connection
opening (large hole) in fitting panel and install fitting
panel in place.
10. Attach the equalizer tube to the suction line. If the
replacement TXV has a flare nut on its equalizer line,
use a tubing cutter to remove the mechanical flare
nut from the equalizer. Then use a coupling to braze
the equalizer line to the stub (previous equalizer line)
in the suction line.
11. Attach TXV bulb in the same location as the original
(in the sensing bulb indent). See Fig. 20.
12. Wrap the bulb in protective insulation and secure us-
ing the supplied bulb clamp. See Fig. 19.
DIRECTION OF
REFRIGERANT FLOW
EQUALIZER TUBE
FROM TXV VALVE
CAPILLARY TUBE
TO TXV
15.9 mm
(REF)
TXV SENSOR BULB
SENSOR BULB
INDENT
SENSOR BULB
INSULATION
C12556
Fig. 19 -- TXV Sensor Bulb Insulation
13. Sweat the inlet of TXV marked “IN” to the liquid
line. Avoid excessive heat which could damage the
TXV valve.
14. Check for leaks.
15. Evacuate system completely and then recharge by
weight without powering on the compressor.
16. Remove lockout/tagout on main power switch and
restore power to unit.
17. Complete charging procedure.
48TC
Summary of Contents for 48TC 04 Series
Page 27: ...27 COOLING CHARGING CHARTS cont C14064 Fig 33 Cooling Charging Charts 12 5 Ton 48TC...
Page 29: ...29 COOLING CHARGING CHARTS cont C13218 Fig 35 Charging Chart 48TC Size D16 48TC...
Page 40: ...40 C14052 Fig 51 Typical Smoke Detector System Wiring 48TC...
Page 122: ...122 APPENDIX III WIRING DIAGRAMS C12413 Fig 103 48TC A04 A07 Power Diagram 208 230 1 60 48TC...
Page 124: ...124 APPENDIX III WIRING DIAGRAM LIST C12415 Fig 105 48TC A04 A07 Power Diagram 575 3 60 48TC...
Page 126: ...126 APPENDIX III WIRING DIAGRAM LIST C13246 Fig 107 48TC A08 A12 Power Diagram 575 3 60 48TC...
Page 128: ...128 APPENDIX III WIRING DIAGRAM LIST C13247 Fig 109 48TC D08 D12 Power Diagram 575 3 60 48TC...
Page 130: ...130 APPENDIX III WIRING DIAGRAM LIST C13249 Fig 111 48TC D14 Power Diagram 575 3 60 48TC...
Page 139: ...139 APPENDIX III WIRING DIAGRAMS C12423 Fig 120 48TC D16 Power Diagram 575 3 60 48TC...
Page 143: ...143 APPENDIX III WIRING DIAGRAM LIST C13485 Fig 124 48TC 16 PremierLink Control Diagram 48TC...
Page 145: ...145 APPENDIX III WIRING DIAGRAM LIST C13487 Fig 126 48TC 16 RTU Open Control Diagram 48TC...
Page 146: ...146 APPENDIX III WIRING DIAGRAM LIST C14124 Fig 127 48TC D08 14 E08 14 W7220 2 Speed IFM 48TC...