Mitsubishi Electric PFD-P250, P500VM-E, PUHY-P250, P500YGM-A Service Manual
AIR CONDITIONERS CITY MULTI
Service Handbook
Issued in Mar. 2006 HWE05250
Printed in Japan
New publication effective Mar. 2006.
Specifications subject to change without notice.
Service Handbook PFD-P250, P500VM-E / PUHY-P250, P500YGM-A
PFD-P250, P500VM-E
PUHY-P250, P500YGM-A
Models
PFD-P250, P500VM-E
PUHY-P250, P500YGM-A
Service Handbook
TENTATIVE
- 1 -
I Indoor Unit Components
[1] Indoor Unit Components and Internal Structure ................................................................ 3
[2] Control Box of the Indoor Unit ........................................................................................... 7
[3] Indoor Unit Circuit Board ................................................................................................... 8
- 2 -
- 3 -
[ I Indoor Unit Components ]
I Indoor Unit Components
[1] Indoor Unit Components and Internal Structure
1. PFD-P250VM-E models
(1) Front view of a indoor unit
(2) Rear view of a indoor unit
Lock key X 2
Display lamp
Panel for refrigerant circuit maintenance
Panel for air filter maintenance
Operation panel (remote controller)
Panel for controller/fan related parts maintenance
- 4 -
[ I Indoor Unit Components ]
(3) Front view of internal structure
(4) Rear view of internal structure
Heat exchanger X 2 (front / back)
Sub drain pan
Suction temperature thermistor
(on the right side of heat exchanger)
Linear expansion valve (LEV)
Drain pan
Drain hose
Pulley X 2
Pipes (gas/liquid)
Fan motor
V belt
Controller
Air filter
Fan casing
(on the back of controller)
Discharge temperature thermistor
(on the left side of fan casing)
Drain hose
Pipes (ga /liquid)
Fan casing
- 5 -
[ I Indoor Unit Components ]
2. PFD-P500VM-E models
(1) Front view of a indoor unit
(2) Rear view of a indoor unit
Lock key X 4
Panel for controller maintenance
Display lamp
Operation panel (remote controller)
Panel for fan related parts maintenance
Panel for refrigerant circuit maintenance
Panel for air filter maintenance
- 6 -
[ I Indoor Unit Components ]
(3) Front view of internal structure
(4) Rear view of a refrigerant circuit
Remote controller
Float switch X 2
Drain pan
Display lamp
Normal/inspection switching switch
Heat exchanger X 2 (front:No. 1; back:No. 2)
Sub drain pan
Suction temperature thermistor
(on the right side of heat exchanger)
Linear expansion valve (LEV)
Drain pan
Operation panel
Bearing
Drain hose
Pulley X 2
Pipes (gas/liquid)
Fan motor
V belt
<Location of drain pan overflow detection float switch>
Controller
Air filter
Fan casing
Discharge temperature thermistor
(on the left side of fan casing)
Bearing
Pipes (gas/liquid)
- 7 -
[ I Indoor Unit Components ]
[2] Control Box of the Indoor Unit
1. PFD-P250VM-E models
2. PFD-P500VM-E models
Circuit board for external I/O
Terminal block for transmission line (upper)
Terminal block for MA remote controller (lower)
Power supply terminal bed
Surge absorber board
Motor wiring
Surge breaker (51F)
Fuse (F1)
Electro magnetic
contactor (52F)
Relay(X11,Z1,Z3)
Controller board
Transformer
Circuit board for external I/O
Terminal block for transmission line on No.2 side (upper)
Terminal block for MA remote controller (lower)
Power supply terminal bed
Terminal block for transmission
line on No.1 side
Motor wiring
Surge breaker (51F)
Electro magnetic
contactor (52F)
Relay(X11,X12,Z1,Z2,Z3)
Controller board
Transformer
Adapter board for LEV
Surge absorber board
Fuse (F1)
- 8 -
[ I Indoor Unit Components ]
[3] Indoor Unit Circuit Board
1. PFD-P250,P500VM-E models
(1) Indoor Control Board
(2) External Input/Output Circuit Board
CND
Power supply
input
(AC 200V)
F901
Fuse
CN2M
Indoor unit
transmission
line
CN3T
Power supply input
(from transformer)
CNT
Power supply output
(to transformer)
CN90
Fan output
CNP
Drain pump
output
CN60
LEV output
SW1,2,3,4
Dip switch
CN24
Control signal
output
CN51
Switch input
LED1
LED2
CN31
Float switch input
CN32
Switch input
SWC
Switching between
discharge/suction control
Thermistor input
CN20
CN21
CN29
CN22
CN33
Lamp output
CN3A
Remote controller connection
CN53
Indoor control board (No.1)
To CN51
CN54
Indoor control board (No.2)
To CN51
TB22 (Relay contact output)
No.1 operation status
No.1 error status
No.2 operation status
No.2 error status
TB23 (Input with voltage)
ON/OFF
TB21 (Input no voltage)
ON/OFF
- 9 -
II Refrigerant Circuit
[1] Principal Parts and Functions .......................................................................................... 11
- 10 -
- 11 -
[ II Refrigerant Circuit ]
II Refrigerant Circuit
[1] Principal Parts and Functions
2. Indoor unit
(1) PFD-P250,500VM-E
Part
name
Symbols
(functions)
Notes Usage Specifications Check method
Linear expansion
valve
(LEV)
LEV 1.Adjusts superheat at the heat
exchanger outlet of the indoor
unit during cooling
2. Adjusts subcool at the heat
exchanger outlet of the indoor
unit during cooling
DC12V
Opening of a valve driven by
a stepping motor
0-(2000) pulses
Continuity check
with a tester
Continuity between white, red,
and orange.
Continuity between yellow,
brown, and blue.
Thermistor
TH21
(Suction
air temperature)
Indoor unit control (Thermo)
0°C : 15kohm
10°C :9.7kohm
20°C :6.4kohm
25°C :5.3kohm
30°C :4.3kohm
40°C :3.1kohm
Resistance check
TH22
(Pipe temperature)
Indoor unit control (Freeze prevention, Pre-heating stand-by)
TH23
(Gas pipe
temperature)
LEV control during cooling operation (Superheat detection)
TH24
(Discharge air
temperature)
Controls indoor unit discharge
(thermostat)
Float
Switch
33P1
33P2
Detects drain pan water level Contact Resistance:
Under 250 mohm
B contact type
Continuity check
with a tester
Motor MF Sends air PFD-P250VM-E
AC400V Type E 4P
Output 3.7kW
Resistance check
PFD-P500VM-E
AC400V Type B 4P
Output 5.5kW
Resistance check
YellowMBlueBrown
White
Red
Orange
R = 15k
0
R = 3460
R = 15
0/80
t
3460
273 t
1
273
1
exp
V
U
W
0.45 10%/2 phases
V
U
W
1.72 10%/2 phases
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