Si002155E
Electronic Expansion Valve / Four Way Valve
Removal Procedure
21
6. Electronic Expansion Valve / Four Way Valve
Warning
Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Be careful not to get yourself burnt with the pipes and other parts that are heated by
the gas brazing machine.
If the refrigerant gas leaks during work, ventilate the room. (If the refrigerant gas is
exposed to flames, toxic gas may be generated.)
Caution
From the viewpoint of global environment protection, do not discharge the refrigerant
gas in the atmosphere. Make sure to collect all the refrigerant gas.
Cautions for restoration
1. Restore the piping by non-oxidation brazing.
2. In order to prevent malfunction or deterioration inside the four way valve or electronic
expansion valve due to overheating, wrap the valve body with a wet cloth and periodically
add water to prevent the cloth from drying. (Ensure that the temperature is below 120°C
(248°F).)
Note
Before working, make sure that the refrigerant gas is empty in the circuit.
Be sure to apply nitrogen replacement when heating up the brazed part.
Do not use a metal saw for cutting pipes by all means because the sawdust comes into
the circuit.
When withdrawing the pipes, be careful not to pinch them firmly with pliers. The pipes
may get deformed.
Provide a protective sheet or a steel plate so that the brazing flame cannot influence
peripheries.
Be careful so as not to burn the compressor terminals, the name plate, the outdoor
heat exchanger fin.
In case of difficulty with gas brazing machine
1. Disconnect the brazed part where is easy to disconnect and restore.
2. Cut pipes on the main unit with a tube cutter in order to make it easy to disconnect.
Step
Procedure
Points
1. Remove the peripheries
beforehand.
*Compressor lead wire
1
Remove the following
parts as necessary.
• Terminal cover
• Protection bushing
• Compressor lead
wires
• High pressure switch
connectors
Protection bushing
U (red)*
W (blue)*
V (yellow)*
Terminal cover
High pressure switch connectors
(R26217)
