116 PB
R-410A REFRIGERANT SYSTEM REPAIR
TXV Replacement
Please follow the steps below when replacing TXV:
NOTICE:
The TXV must be able to open to the maximum angle while running in
heating mode and be adjusted to 4‑6˚ F superheat.
1. Disassemble the front panel.
2. Remove the thermal bulb down by undoing the insulation around it.
3. Seal the pressure pipe from the gas pipe with a welding torch. Be
careful not to burn the gas pipe.
4. Remove the TXV off from the liquid pipe with a welding torch. Be
careful not to burn the liquid pipe.
5. Wrap the new TXV with a piece of wet cloth to prevent damage
caused by heat from being too hot and connect the nitrogen flow to the
liquid pipe to prevent it from being oxidized. Weld the TXV to the liquid
pipe, (solder must be 5% or more silver content) and pay attention to
the direction of the TXV, then weld the pressure pipe to the gas pipe.
6. When the pipe cools down, connect it with 550 PSI nitrogen
equipment and examine the work for any leaks.
7. Secure the thermal bulb to the gas pipe with insulation strips and
perform insulation works.
8. Evacuate the system and charge using the triple evacuation
procedure.
9. Allow the unit to operate for 20 minutes, then adjust the TXV
superheat to 4‑6˚F.
10. After the unit has operated for another 20 minutes, examine
whether the superheat is appropriate and record the reading.
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
NOTICE
FIRE HAZARD
electically unsafe conditions which could cause moderate
or serious property damage.
Read, understand and follow the above warning.
WARNING
EXPLOSION HAZARD
The use of nitrogen requires a pressure
regulator. Follow all safety procedures and
wear protective safety clothing etc.
Failure to follow proper safety procedures
could result in serious injury or death.
To Next Page
Loading...
Need help?
General