Mitsubishi Electric PU-P1.6VGA, Technical & Service Manual

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26
OPERATING PROCEDURE PHOTOS
Photo 4
4. Removing the liquid temperatuer thermistor, discharge
temperatuer thermistor and condenser/evaporator
temperature thermistor
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(When the top panel removing is not possible, remove
the electric parts box. Refer to (3).)
w
When removing liquid temperature thermistor and the
discharge temperature thermistor, it unnecessary to
remove the top panel. (See Photo 5)
(3) Disconnect the lead wire of the liquid temperature thermistor,
discharge temperature thermistor and condenser/evaporator
temperature thermistor from the housing (TH3, TH4, TH6)
on the controller board.
(4) Loosen the 1 lead wire clamps on the electrical box.
(5) Pull out the thermistor from the sensor holder.
5. Removing the bypass valve solenoid coil (SV)
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(When the top panel removing is not possible, remove
the electrical box. Refer to (3). )
(3) Remove coil fixing screw (M4
✕
8) and disconnect the
lead wire of the bypass valve solenoid coil (SV) from on
the controller board.
Electrical
box
8. Removing the 4-way valve
(1) Remove the service panel. (See Photo 1)
(2) Remove the R.V. coil. (See Photo 5)
(3) Remove the braze pipe of the 4-way valve.
Note: When installing the 4-way valve, cover the 4-way valve
with a wet cloth to prevent the 4-way valve from heating,
then braze the pipe.
6. Removing the bypass valve
(1) Remove the service panel. (See Photo 1)
(2) Remove the top panel. (See Photo 1)
(3) Remove the bypass valve solenoid coil. (See Photo 4)
(4) Remove the braze at the intake and outlet of the bypass
valve.
Note: When installing the bypass valve, cover the bypass
valve with a wet cloth to prevent the bypass valve
from heating, then braze the pipe.
Photo 5
Clamp
Bypass valve
solenoid coil
fixing screw
Rear panel
Pressure
switch
<Low>
Condenser/evaporator
temperature thermistor
R.V. coil
R.V. coil
fixing screw
4-way valve
Pressure
switch
<High>
Bypass valve
solenoid coil
Liquid
temperature
thermistor
Discharge
temperature
thermistor
7. Removing the R.V. coil (21S4)
(1) Remove the service panel. (See Photo 1)
(2) Remove coil fixing screw (M5
✕
6) and disconnect the
lead wire of the R.V. coil (21S4) from the on the controller
board.
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