Mitsubishi Electric PUHZ-RP35VHA2 User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES................................. 3
2. REFERENCE MANUAL.................................. 4
3. SAFETY PRECAUTION..................................5
4. FEATURES......................................................9
5. SPECIFICATIONS.........................................10
6. DATA............................................................. 13
7. OUTLINES AND DIMENSIONS.................... 20
8. WIRING DIAGRAM....................................... 25
9. WIRING SPECIFICATIONS.......................... 35
10. REFRIGERANT SYSTEM DIAGRAM............... 40
11. TROUBLESHOOTING...................................43
12. FUNCTION SETTING.................................. 110
13. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER
..... 117
14. EASY MAINTENANCE FUNCTION............ 127
15. DISASSEMBLY PROCEDURE................... 132
16. PARTS LIST................................................ 154
17. RoHS PARTS LIST..................................... 165
No.OC374
REVISED EDITION-F
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
R410A
May 2009
Outdoor unit
[model names]
PUHZ-RP35VHA2 PUHZ-RP35VHA3
PUHZ-RP50VHA2 PUHZ-RP50VHA3
PUHZ-RP60VHA2 PUHZ-RP60VHA3
PUHZ-RP71VHA2 PUHZ-RP71VHA3
PUHZ-RP100VHA2 PUHZ-RP100VHA3
PUHZ-RP125VHA2
PUHZ-RP140VHA2
PUHZ-RP100YHA2 PUHZ-RP100YHA3
PUHZ-RP125YHA2
PUHZ-RP140YHA2
[Service Ref.]
Service Ref. is on page 2.
PUHZ-RP60VHA2 PUHZ-RP60VHA21
PUHZ-RP71VHA2 PUHZ-RP71VHA21
PUHZ-RP60VHA3 PUHZ-RP71VHA3
PUHZ-RP60VHA3#1 PUHZ-RP71VHA3#1
NOTE:
• This manual describes only
service data of the outdoor
units.
• RoHS compliant products have
<G> mark on the spec name
plate.
• For servicing of RoHS compli-
ant products, refer to the RoHS
PARTS LIST.
Revision:
• "17. RoHS PARTS LIST" has
been modified.
• Please void OC374 REVISED
EDITION-E.

132
15 DISASSEMBLY PROCEDURE
OPERATING PROCEDURE PHOTOS
PUHZ-RP35, 50VHA2(1)/VHA3
1. Removing the top panel, service panel, front panel and
back panel
(1) Remove the top panel fixing screws (4 × 10), one from
the right and two from the left side, and detach the top
panel.
(2) Remove 1 service panel fixing screw (4 × 10) and detach
the service panel by pulling it downward. (See Photo 2.)
(3) Remove the front panel fixing screws (4 × 10), 5 from the
front, 2 from the right and 2 from the left side, and detach
the front panel.
(4) Remove the back panel fixing screws (4 × 10), 4 from the
right and 3 from the rear side, and detach the back panel.
2. Removing the fan motor
(1) Remove the top panel. (See Photo 1)
(2) Remove the front panel. (See Photo 1)
(3) Remove 1 nut (M6, left-screw) and detach the propeller.
(4) Disconnect the connector CNF1 on the controller circuit
board in the electrical parts box.
(5) Loosen the clamp for the lead wire in the motor support.
(6) Remove 4 fan motor fixing screws (4 × 18) and detach the
fan motor. (See Photo 3)
Photo 1
Photo 2
Top panel Top panel
fixing screws
Service panel
Service panel
for charge
plug
Grille
Front panel
Back panel
4 hooks
Pull down
Service panel
fixing screw
Photo 3
Propeller
Nut
Electrical parts box
Photo 4
Fan
motor
(MF1)
Fan motor fixing screws
Fan motor fixing screws
Motor support
Clamp

133
OPERATING PROCEDURE PHOTOS
4. Removing the thermistor <Outdoor 2-phase pipe> (TH6)
and thermistor <Outdoor pipe> (TH3) (TH33)
(1) Remove the service panel. (See Photo 2.)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel fixing screws, 4 from the right and
3 from the rear side, and detach the back panel.
(See photo 1.)
(5) Disconnect the connector TH3 (white) or TH6/7 (red) or
TH33 (yellow) on the controller circuit board in the
electrical parts box.
(6) Loosen the clamp for the lead wire in the rear of the
electrical parts box.
(7) Pull out the thermistor <Outdoor pipe> (TH3), (TH33) and
thermistor <Outdoor 2-phase pipe> (TH6) from the
sensor holder.
Note: Replace the thermistor <Outdoor 2-phase pipe> (TH6)
and the thermistor <Outdoor> (TH7) together since
they are combined.
Refer to No. 5. to remove the thermistor <Outdoor> (TH7).
3. Removing the electrical parts box
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Disconnect the indoor/outdoor connecting wire from
terminal block.
(5) Remove all the following connectors from controller circuit board;
fan motor, LEV, thermistor<Outdoor pipe>,
thermistor<Discharge>, thermistor<Outdoor 2-phase pipe>,
thermistor<Outdoor>, high pressure switch, 4-way valve
and bypass valve.
Pull out the disconnected wire from the electrical parts box.
<Diagram symbol in the connector housing>
• Fan motor (CNF1)
• LEV (LEV-A and LEV-B)
• Thermistor <Outdoor pipe> (TH3) (TH33)
• Thermistor <Discharge> (TH4)
• Thermistor <Outdoor 2-phase pipe, Outdoor> (TH6/7)
• High pressure switch (63H)
(6) Remove the terminal cover and disconnect the compressor
lead wire.
(7) Remove the electrical parts box fixing screws, 1 from the
front, the right and the rear side, and detach the electrical
parts box by pulling it upward.
Photo 5
Electrical parts box Controller circuit
board (C.B.)
Electrical
parts box
fixing
screw
Terminal
block
(TB1)
Compressor (MC)
Terminal
cover
Photo 6
Thermistor
<Outdoor 2-phase pipe>
(TH6)
Clamp
Electrical
parts box
Thermistor
<Outdoor pipe>
(TH3)
Thermistor
<Outdoor pipe>
(TH33)

134
OPERATING PROCEDURE PHOTOS
5. Removing the thermistor <Outdoor> (TH7)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Disconnect the connector TH7 (red) on the controller circuit
board in the electrical parts box.
(4) Loosen the clamp for the lead wire in the rear of the
electrical parts box. (See Photo 4)
(5) Pull out the thermistor <Outdoor> (TH7) from the sensor
holder.
Note: In case of replacing thermistor <Outdoor> (TH7),
replace it together with thermistor <Outdoor 2-phase
pipe> (TH6), since they are combined together.
Refer to No.4. to remove thermistor
<Outdoor 2-phase pipe>.
Photo 7
Photo 9
6. Removing the thermistor <Discharge> (TH4)
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove the electrical parts box. (See Photo 5)
(6) Pull out the thermistor <Discharge> (TH4) from the sensor
holder. (See Photo 8.)
wWhen attaching the thermistor <Discharge> (TH4), place it
to its original position.
7. Removing the 4-way valve (21S4) and LEV coil (LEV (A),
LEV (B))
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove the electrical parts box. (See Photo 5)
[Removing the 4-way valve (21S4)]
(6) Remove 1 4-way valve fixing screw (M4 × 6).
(7) Remove the 4-way valve by sliding the coil to the right.
[Removing the LEV coil (LEV (A), LEV (B)) ]
(6) Remove the LEV coil by sliding the coil upward.
Thermistor <Outdoor>
(TH7)
Sensor holder
Electrical parts box
Photo 8
Thermistor <Discharge>
(TH4)
4-way valve fixing screw
4-way valve
LEV coil (LEV B)
LEV coil (LEV A)
4-way valve (21S4)
LEV

135
OPERATING PROCEDURE PHOTOS
8. Removing the 4-way valve
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove the electrical parts box. (See Photo 5)
(6) Remove the 4-way valve (See Photo 8)
(7) Recover refrigerant.
(8) Remove the welded part of 4-way valve.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by remov-
ing the right side panel.
Note 3:
When installing the 4-way valve, cover it with a wet
cloth to prevent it from heating (120°C or more),
then braze the pipes so that the inside of pipes are
not oxidized.
Photo 10
Photo 11
9. Removing LEV
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove the electrical parts box. (See Photo 5)
(6) Remove the LEV coil . (See Photo 8)
(7) Recover refrigerant.
(8) Remove the welded part of LEV.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by remov-
ing the back panel.
Note 3: When installing the LEV, cover it with a wet cloth
to prevent it from heating (120°C or more), then
braze the pipes so that the inside of pipes are not
oxidized.
10. Removing the high pressure switch (63H)
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove the electrical parts box. (See Photo 5)
(6) Pull out the lead wire of high pressure switch.
(7) Recover refrigerant.
(8) Remove the welded part of high pressure switch.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by
removing the back panel.
Note 3: When installing the high pressure switch, cover it
with a wet cloth to prevent it from heating (100°C
or more), then braze the pipes so that the inside
of pipes are not oxidized.
Reactor fixing screw
High pressure
switch (63H)
Reactor fixing screws
Reactor
(ACL)
Electrical
parts box
11. Removing the reactor (ACL)
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove 3 reactor fixing screws (4 × 20) and remove the
reactor.
wThe reactor is attached to the rear of the electrical parts box.
4-way valve fixing screw
4-way valve
LEV coil (LEV B)
LEV coil (LEV A)
4-way valve (21S4)
LEV
Photo 12
Charge plug

136
OPERATING PROCEDURE PHOTOS
Photo 13
Photo 14
Compressor
(MC)
Valve bed
Separator
Separator
fixing screw
Compressor
fixing nut
Power
receiver
Power
receiver
Outlet
Inlet
12. Removing the compressor (MC)
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove the electrical parts box. (See Photo 5)
(6) Remove 3 separator fixing screws (4 × 10) and remove
the separator.
(7) Recover refrigerant.
(8) Remove 3 compressor fixing nuts by using a spanner or a
adjustable wrench.
(9) Remove the welded pipe of motor for compressor inlet
and outlet.
Note: Recover refrigerant without spreading it in the air.
Receiver leg
fixing screw
Receiver leg
13. Removing the power receiver
(1) Remove the service panel. (See Photo 2)
(2) Remove the top panel. (See Photo 1)
(3) Remove the front panel. (See Photo 1)
(4) Remove the back panel. (See Photo 1)
(5) Remove the electrical parts box. (See Photo 5)
(6) Recover refrigerant.
(7) Remove 4 welded pipes of power receiver inlet and outlet.
(8) Remove 2 receiver leg fixing screws (4 × 10).
(9) Remove the power receiver together with the receiver leg.
Note: Recover refrigerant without spreading it in the air.

137
OPERATING PROCEDURE PHOTOS & ILLUSTRATION
PUHZ-RP60,71VHA2(1) / VHA3 / VHA3#1
1. Removing the service panel and top panel
(1) Remove 3 service panel fixing screws (5 × 10) and slide
the hook on the right downward to remove the service
panel.
(2) Remove screws (3 for front, 3 for rear/5 × 10) of the top
panel and remove it.
2. Removing the fan motor (MF1)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove 5 fan grille fixing screws (5 × 10) to detach the
fan grille. (See Figure 1)
(4) Remove a nut (for right handed screw of M6) to detach
the propeller. (See Photo 1)
(5) Disconnect the connector CNF1 on controller circuit
board in electrical parts box.
(6) Remove 4 fan motor fixing screws (5 × 25) to detach the
fan motor. (See Photo 2)
Cover panel fixing screws
Figure 1 Top panel fixing screws Top panel
Service panel
fixing screws
Service panel
Grille fixing screws
Fan grille
Slide
Photo 3
Electrical parts box
Controller circuit
board
(C.B.)
Electrical parts
box fixing screw
Terminal cover
Cover panel
(Front)
Compressor (MC)
Terminal block
(TB1)
Valve bed
Screw
Fan motor fixing screws
Fan
motor
(MF1)
Fan motor
fixing screws
Photo 2
Photo 1
Propeller
Front panel
Front panel fixing screws
Nut
3. Removing the electrical parts box
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Disconnect the indoor/outdoor connecting wire from
terminal block.
(4) Remove all the following connectors from controller circuit board;
fan motor, LEV, thermistor<Outdoor pipe>,
thermistor<Discharge>, thermistor<Outdoor 2-phase pipe>,
thermistor<Outdoor>, thermistor<Heatsink>,
high pressure switch, 4-way valve and bypass valve.
Then remove a screw (4 × 8) from the valve bed to
remove the lead wire.
Pull out the disconnected wire from the electrical parts box.
<Diagram symbol in the connector housing>
• Fan motor (CNF1)
• LEV (LEV-A and LEV-B)
• Thermistor <Outdoor pipe> (TH3) (TH33)
• Thermistor <Discharge> (TH4)
• Thermistor <Outdoor 2-phase pipe, Outdoor> (TH6/7)
• Thermistor <Heatsink> (CN3)
• High pressure switch (63H)
• 4-way valve coil (21S4)
• Bypass valve coil (SV2)
• Thermistor <Shell> (TH32) only for VHA3#1
(5) Remove the terminal cover and disconnect the compressor
lead wire.
(6) Remove an electrical parts box fixing screw (4 × 10) and
detach the electrical parts box by pulling it upward. The
electrical parts box is fixed with 2 hooks on the left and 1
hook on the right.

138
Thermistor
<Outdoor 2-phase pipe>
(TH6)
OPERATING PROCEDURE PHOTOS
Photo 4
4. Removing the thermistor <Outdoor 2-phase pipe> (TH6)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Disconnect the connectors, TH7/6 (red), on the
controller circuit board in the electrical parts box.
(4) Loosen the clamp for the lead wire in the rear of the
electrical parts box.
(5) Pull out the thermistor <Outdoor 2-phase pipe> (TH6)
from the sensor holder.
Note: In case of replacing thermistor <Outdoor 2-phase
pipe> (TH6), replace it together with thermistor
<Outdoor> (TH7), since they are combined together.
Refer to No.5 below to remove thermistor <Outdoor>.
5. Removing the thermistor <Outdoor> (TH7)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Disconnect the connector TH7/6 (red) on the controller
circuit board in the electrical parts box.
(4) Loosen the clamp for the lead wire in the rear of the
electrical parts box. (See Photo 4)
(5) Pull out the thermistor <Outdoor> (TH7) from the sensor
holder.
Note: In case of replacing thermistor <Outdoor> (TH7),
replace it together with thermistor <Outdoor 2-phase
pipe> (TH6), since they are combined together.
Refer to No.4 above to remove thermistor
<Outdoor 2-phase pipe>.
Photo 6 PUHZ-RP60/71VHA2(1)
Clamp
6. Removing the thermistor <Outdoor pipe> (TH3) (TH33) and
thermistor <Discharge> (TH4), thermistor <Shell> (TH32)
(1) Remove the service panel. (See Figure 1)
(2) Disconnect the connectors, TH3 (white) and TH4 (white),
TH33 (yellow), TH32 (black) on the controller circuit board
inthe electrical parts box.
(3) Loosen the clamp for the lead wire in the rear of the
electrical parts box. (See Photo 4)
(4) Pull out the thermistor <Outdoor pipe> (TH3), (TH33) and
thermistor <Discharge> (TH4) from the sensor holder.
[Removing the thermistor<Shell> (TH32)]
for 60/71VHA3#1
(5) Pull out the themistor <Shell> (TH32) from the holder of
the compressor shell.
VHA2(1)(TH33 : See Photo 9)
VHA3 (#1) (TH3, TH33 : See Figure 2)
Electrical parts box
Photo 5
Lead wire of thermistor
<Outdoor> (TH7)
Sensor holder
Thermistor<Discharge> (TH4) Thermistor<Outdoor pipe> (TH3)
Controller
circuit board
(C.B.)
Lead wire of thermistor <Outdoor> (TH7) Sensor holder
PUHZ-RP60/71VHA2
PUHZ-RP60/71VHA21 PUHZ-RP60/71VHA3(#1)

139
OPERATING PROCEDURE PHOTOS
7. Removing the 4-way valve coil (21S4), LEV coil (LEV(A),
LEV(B)) and bypass valve coil (SV)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 4)
[Removing the 4-way valve coil]
(4) Remove 4-way valve coil fixing screw (M4 × 6).
(5) Remove the 4-way valve coil by sliding the coil toward you.
(6) Disconnect the connector 21S4 (green) on the controller
board in the electrical parts box.
[Removing the LEV coil]
(4) Remove the LEV coil by sliding the coil upward.
(5) Disconnect the connectors, LEV A (white) and LEV B (red),
on the controller circuit board in the electrical parts box.
[Removing the bypass valve coil]
(4) Remove the bypass valve coil fixing screw (M4 × 6).
(5) Remove the bypass valve coil by sliding the coil upward.
(6) Disconnect the connector SV2 (blue) on the controller cir-
cuit board in the electrical parts box.
8. Removing the 4-way valve
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 3)
(4) Remove 3 valve bed fixing screws (4 × 10) and 4 ball valve
and stop valve fixing screws (5 × 16) and then remove the
valve bed.
(5) Remove 3 right side panel fixing screws (5 × 10) in the rear
of the unit and then remove the right side panel.
(6) Remove the 4-way valve coil. (See Photo 7)
(7) Recover refrigerant.
(8) Remove the welded part of four-way valve.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by remov-
ing the right side panel.
Note 3: When installing the 4-way valve, cover it with a wet
cloth to prevent it from heating (120°C or more),
then braze the pipes so that the inside of pipes are
not oxidized.
9. Removing the LEV
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 3)
(4) Remove 3 valve bed fixing screws (4 × 10) and 4 ball valve
and stop valve fixing screws (5 × 16) and then remove the
valve bed.
(5) Remove 3 right side panel fixing screws (5 × 10) in the rear
of the unit and then remove the right side panel.
(6) Remove the LEV.
(7) Recover refrigerant.
(8) Remove the welded part of linear expansion valve.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by remov-
ing the right side panel.
Note 3: When installing the LEV, cover it with a wet cloth
to prevent it from heating (120°C or more), then
braze the pipes so that the inside of pipes are not
oxidized.
Photo 7 (PUHZ-RP60/71VHA2(1))
Photo 8 (PUHZ-RP60/71VHA2(1))
4-way valve
fixing screw
4-way valve
LEV coil (LEV B) LEV coil (LEV A)
Bypass valve
coil fixing
screw
LEV coil (LEV B) LEV coil (LEV A)
LEV
4-way
valve
LEV
Bypass valve
coil (SV)
4-way valve
coil (21S4)
4-way valve coil (21S4)
Bypass
valve
Bypass
valve
coil (SV)
Charge
plug
(High
pressure)
Charge
plug
(Low
pressure)
Stop valve
Figure 2 (PUHZ-RP60/71VHA3(#1))
LEV
Thermistor
<Outdoor pipe>
(TH33)
4-way
valve
Bypass valve coil
fixing screw
LEV coil
(LEV A)
Bypass valve
coil (SV)
Bypass valve
4-way valve
coil (21S4)
LEV coil
(LEV B)
Thermistor
<Outdoor pipe>
(TH3)
High pressure
switch(63H)
Thermistor
<Discharge>
(TH4)

140
OPERATING PROCEDURE PHOTOS
10. Removing the bypass valve
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 3)
(4) Remove 3 right side panel fixing screws (5 × 10) in the
rear of the unit and remove the right side panel.
(5) Remove the bypass valve solenoid coil. (See Photo 7).
(6) Recover refrigerant.
(7) Remove the welded part of bypass valve.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by
removing the right side panel.
12. Removing the reactor (ACL)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 3)
(4) Remove 3 reactor fixing screws (4 × 16) and remove the
reactor.
wThe reactor is attached to the rear of the electrical parts box.
Photo 9 (PUHZ-RP60/71VHA2(1))
11. Removing the high pressure switch (63H)
(1) Remove the service panel. (See Figure 1)
(2) Remove the top panel. (See Figure 1)
(3) Remove the electrical parts box. (See Photo 3)
(4) Remove 3 right side panel fixing screws (5 × 10) in the
rear of the unit and remove the right side panel.
(5) Pull out the lead wire of high pressure switch.
(6) Recover refrigerant.
(7) Remove the welded part of high pressure switch.
Note 1: Recover refrigerant without spreading it in the air.
Note 2: The welded part can be removed easily by
removing the right side panel.
Note 3: When installing the high pressure switch, cover it
with a wet cloth to prevent it from heating (100°C
or more), then braze the pipes so that the inside
of pipes are not oxidized.
LEV coil (LEV B) LEV coil (LEV A)
LEV
Bypass
valve
4-way valve
Reactor fixing screws
Lead wire of
high pressure switch High pressure switch (63H)
Photo 10
LEV
Electrical parts box
Reactor fixing screw
Reactor
(ACL)
Photo 11
Bypass valve coil
(SV)
4-way valve coil
(21S4)
Thermistor
<Outdoor pipe>
(TH33)