Heating - Mitsubishi Electric PU-P3VGAAPUH-P3YGAA PU-P3YGAAPUH-P4VGAA PU-P4VGAAPUH-P4YGAA PU-P4YGAAPUH-P5YGAA PU-P5YGAAPUH-P6YGAA PU-P6YGAA Technical & Service Manual

OPERATING PROCEDURE
4. Removing the liquid temperature thermistor, discharge
temperature 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
lead wire of the bypass valve solenoid coil (SV) from on
the controller board.
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) Recover gas from the refrigerant circuit.
(5) Remove the braze at the intake and outlet of the bypass
valve.
Note :
Before using a burner, reclaim gas from the pipes until the
pressure gauge shows 0 kg/cm
Use the burner under the condition that gas can be recovered
even when the inner pressure rises by heat.
When installing the bypass valve, cover it with a wet cloth to
prevent it from heating, then braze the pipes.
7. Removing the 4-way valve solenoid coil (21S4)
(1) Remove the service panel. (See Photo 1)
(2) Remove 4-way valve solenoid coil fixing screw (M5
and disconnect the
lead wire of the 4-way valve solenoid coil (21S4) from the
controller board.
8. Removing the 4-way valve
(1) Remove the service panel. (See Photo 1)
(2) Remove the 4-way valve solenoid coil. (See Photo 5)
(3) Recover gas from the refrigerant circuit.
(4) Remove the braze pipe of the 4-way valve.
Note :
Before using a burner, reclaim gas from the pipes until the
pressure gauge shows 0 kg/cm
Use the burner under the condition that gas can be recovered
even when the inner pressure rises by heat.
When installing the 4-way valve, cover it with a wet cloth to
prevent it from heating, then braze the pipes.
8) and disconnect the
2 (0 MPa).
6)
2 (0 MPa).
37
PHOTOS
Photo 4
Clamp
Electrical box
Rear panel
Linear
expansion
valve coil
Photo 5
Pressure switch <High>
Liquid
temperature
thermistor
Condenser/evaporator
temperature thermistor
Bypass valve
solenoid coil
fixing screw
Bypass valve
solenoid coil
4-way valve
4-way valve
solenoid coil
fixing screw
4-way valve
solenoid coil
Discharge
temperature
thermistor