Mitsubishi Electric City Multi PUMY-P36NHMU Technical & Service Manual page 22

PUMY-P36NHMU
SYMBOL
TB1 Terminal Block <Power Supply>
TB3 Terminal Block <Comunication Line>
TB7 Terminal Block <Centralized Control Line>
MC Motor For Compressor
MF1,MF2 Fan Motor
21S4 Solenoid Valve<Four-Way Valve>
63H High Pressure Switch
63L Low Pressure Switch
63HS High Pressure Sensor
SV1 Solenoid Valve<Bypass valve>
TH3 Thermistor<Outdoor Pipe>
TH4 Thermistor<Discharge>
TH6 Thermistor<Low Pressure Saturated>
TH7 Thermistor<Outdoor>
TH8 Thermistor<Heatsink>
Reactor
DCL
ACTM Active Filter Module
CE Main Smoothing Capacitor
Caution for electrical work
Use copper supply wires.
Cautions when Servicing
• WARNING: When the main supply is turned off, the voltage [340 V] in the main capacitor will drop to 20 V in approx. 2
!
minutes (input voltage: 240 V). When servicing, make sure that LED1, LED2 on the outdoor circuit board goes out, and then
wait for at least 1 minute.
• Components other than the outdoor board may be faulty: Check and take corrective action, referring to the service manual.
Do not replace the outdoor board without checking.
NOTES:
1.Refer to the wiring diagrams of the indoor units for details on wiring of each indoor unit.
Self-diagnosis function
The indoor and outdoor units can be diagnosed automatically using the self-diagnosis switch
(SW1) and LED1, LED2 (LED indication) found on the multi-controller of the outdoor unit.
LED indication : Set all contacts of SW1 to OFF.
• During normal operation
• The LED indicates the drive state of the controller in the outdoor unit.
Bit 1
Compressor
Indication 52C
operated
• When fault requiring inspection has occurred
The LED alternately indicates the inspection code and the location of the unit in which
the fault has occurred.
PUMY-P36NHMU-BS
NAME SYMBOL
P.B. Power Circuit Board
TABU/V/W Connection Terminal<U/V/W-Phase>
TABS/T Connection Terminal<L/N-Phase>
TABP1/P2/P Connection Terminal<DC Voltage>
Connection Terminal<DC Voltage>
TABN1/N2/N
DS2,DS3 Diode Bridge
IPM Power Module
N.F. Noise Filter Circuit Board
LI/LO Connection Terminal<L-Phase>
NI/NO Connection Terminal<N-Phase>
EI,E2 Connection Terminal<Ground>
52C 52C Relay
C.B. Controller Circuit Board
SW1
Switch<Display Selection>
SW2 Switch<Function Selection>
SW3 Switch<Test Run>
SW4 Switch<Model Selection>
SW5 Switch<Function Selection>
2 3 4
21S4 SV1 (SV2)
PUMY-P48NHMU
NAME
M-NET P.B.
5 6 7
Always lit
- -
22
PUMY-P48NHMU
2
SYMBOL NAME
SW6 Switch<Function Selection>
SW7
Switch<Function Selection>
SW8 Switch<Function Selection>
SWU1
Switch<Unit Address Selection, 1s digit>
SWU2 Switch<Unit Address Selection, 10ths digit>
CNLVB Connector<To N.F. Board CN52C>
(Symbol of Board is CNLVB)
SS Connector<Connection For Option>
CN3D Connector<Connection For Option>
CN3S Connector<Connection For Option>
CN3N Connector<Connection For Option>
CN51 Connector<Connection For Option>
LED1,LED2 LED<Operation Inspection Display>
LED3
LED<Power Supply to Main Microcomputer>
F1,F2 Fuse<T6,3AL250V>
X501~505 Relay
M-NET Power Circuit Board
TP1 ConnectionTerminal<Ground>
[Example]
When the compressor and
SV1 are turned during cooling
operation.
8
1 2 3 4 5 6 7 8
-BS
2