Test Point Diagram; Outdoor Multi Controller Circuit Board - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

8-8. TEST POINT DIAGRAM

Outdoor multi controller circuit board

SW8
Model selection
SW6
Function selection
SW5
Function selection
SWP2
Display selection
SWP1
Display selection
SW1
Display selection
(Self-diagnosis)
SW9
Function selection
SWU2, SWU1
Address setting
CNLVB
Linear expansion Valve
CNLVA
Linear expansion Valve
CN52
Connect to the noise filter
circuit board (CN52)
CN3N
Auto change over
CN3D
Input of 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
SP
(Voltage between pins of
C515 and C516):
0 VDC (when stopped)
1–6.5 VDC (when operated)
(Same as CNF1,2 6(+)–4(−))
OCH760
SW3
SW2 SW7
Test run
Pump down Manual defrost
V
CNF1, 2
DC
(Voltage between pins of C510)
Connect to fan motors
1–4: 310–340 VDC
(Same as CNF1,2 1(+)–4(−))
5–4: 15 VDC
6–4: 0–6.5 VDC
7–4: 15 VDC (when stopped)
0–15 VDC pulse
(when operated)
<CAUTION> TEST POINT 1 is high voltage.
SW4
Model selection
(TEST POINT1)
CNDC
310–340 VDC
: 310–340 VDC
(1(+)–3(−))
102
CN51
External signal
output
CN102
Connect to the M-NET P.B
(CN2) (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 (CN4)
CN2
Connect to the outdoor
power circuit board (CN2)
1–5:
Power circuit board →
Transmitting signal to
the multi controller board
(0–5 VDC)
2–5: Zero cross signal
(0–5 VDC)
3–4: Not used
6–5: 15 VDC
7–5: 15 VDC
CNAC
Power supply for multi
controller board (CNAC2)
230 VAC
63H
High pressure switch
SV1
Bypass valve
21S4
4-way valve
SV3
Oil return valve
V (TEST POINT2)
CC
(Voltage between pins of
C82A): 15 VDC
(Same as CNF1,2 5(+)–4(−))