Mitsubishi Electric CITY MULTI PUMY-P112VKM5 Technical & Service Manual page 110

8-9. TEST POINT DIAGRAM
Outdoor multi controller circuit board
SW2
SW8
Pump down
Model selection
SW6
Function selection
SW5
Function selection
SW9
Function selection
SW1
Display selection
(Self-diagnosis)
SWU2, SWU1
Address setting
CNLVB
Linear expansion
valve
CNLVA
Linear expansion
valve
CN3N
Auto change over
63H
High pressure switch
CN3D
Input of silent mode or
demand control
TH2 Thermistor
<HIC pipe>
TH4 Thermistor
<Compressor>
TH3 Thermistor
<Outdoor liquid pipe>
TH7/TH6 Thermistor
<Ambient/Suction pipe>
63HS
High pressure sensor
63LS
Low pressure sensor
V (TEST POINT4)
FG
(Voltage between pin3 and
pin4 of PC511 or PC512):
(Correspond to CNF1, 2
7(+)–4(−))
V CNF1, 2
SP
Connect to fan motors
(Voltage between pins of
C515 and C516): 1–4: 310–340 VDC (Y)
0 VDC (when stopped)
1–6.5 VDC (when operated)
5–4: 15 VDC
(Same as CNF1,2 6(+)–
6–4: 0–6.5 VDC
7–4: 15 VDC (when stopped)
4(−))
OCH740
SW3 SW7
Test run Manual defrost
V (TEST POINT1)
DC
(Voltage between pins of C510)
: 310–380 VDC (V)
(Same as CNF1,2 1(+)–4(−))
0–15 VDC pulse
(when operated)
<CAUTION> TEST POINT 1 is high voltage.
CN51
SW4
External signal
Model selection
output
CNDC
310–340 VDC (Y)
: 310–340 VDC (Y)
310–380 VDC (V)
: 310–380 VDC (V)
(1(+)–3(−))
110
CN102
Connect to the M-NET
power circuit board
CN40,CN41
Centralized control power
supply/For storing
jumper connector selection
CNS2
Transmission wire of
centralized control
CNS1
Indoor/outdoor unit
connecting wire
CN4
Connect to the outdoor
power circuit board
CN2
Connect to the outdoor
power circuit board
1–5:
Power circuit board →
Transmitting signal to the outdoor
multi controller circuit board
(0–5 VDC)
2–5: Zero cross signal
(0–5 VDC)
3–4: 15 VDC (V)
6–5: 15 VDC
7–5: 15 VDC
CNAC
Power supply for outdoor
multi controller circuit board
230 VAC
SV1
Bypass valve
21S4
4-way valve
V (TEST POINT2)
CC
(Voltage between pins of
C82A): 15 VDC
(Same as CNF1, 2 5(+)–4(−))