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Mitsubishi Electric PUHZ-W85VHA Service Manual Page 26

Air to water heat pump.
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8-6. TEST POINT DIAGRAM
Outdoor controller circuit board
CNS
S1-S2: 220-240 V AC
Communication
+
power supply
D71 Voltage
24 V DC
CNAC
2 to 4: Power supply
for outdoor controller
circuit board
(220-240 V AC)
1 to 3:
Power supply for
interface unit/Flow
temp. controller-
outdoor unit connec-
tion wire
(220-240 V AC)
CN2
Connect to the out-
door power circuit
board (CN2).
1-5:
Power circuit board
Transmitting signal
to the controller circuit
board
(0-5 V DC)
2-5: Zero cross signal
(0-5 V DC)
3-4: 18 V DC
6-5: 16 V DC
7-5: 16 V DC
[ 5: – 1,2,6,7: + ]
21S4
Four-way
valve
SV2
Bypass valve
CN4
Transmission
to outdoor
power circuit
board (CN4)
CN52C
Connect to the outdoor noise
filter circuit board. (CN52C)
(TEST POINT 2)
V
CC
(voltage between pins of C6B): DC 15 V
SW10
Model select
<CAUTION> TEST POINT 1 is high voltage.
63H
High pressure switch
SW2
Operation monitor function
26
(TEST POINT 1)
V
DC
(voltage between pins of C5E)
: DC 280 V-380 V
CNDC
+
DC 280 V -380 V
}
Connect from out-
door power circuit
board.
V
SP
(voltage between pins
of C5B): DC 0 V (when
stopped), DC 1 – 6.5 V
(when operated)
V
FG
(voltage between right
pins of PC5D, pin 3
and pin 4)
TH32
Thermistor
<Inlet water temperature>
TH6
Thermistor
<Plate Hex liquid
temperature>
TH7
<Ambient temperature>
TH3
Thermistor
<Liquid temperature>
TH4
Thermistor
<Discharge>
LEV-A,-B
Linear expansion valve
SW8
Function switch
SW5
Function switch
SW6
Model select
SW1
Forced defrost,
detect history
record reset

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