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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
8.3 ODU PCB & IPM
8.3.1 PCB: Multi Zone Regular 18K BMS500-AAM018-1CSXRC
Figure 38
No. LED STATUS CN# Meaning
1 Power Supply
CN11 L_in: connect to N-line (208-230V AC input)
CN12 N_in: connect to L-line (208-230V AC input)
2
Electronic Expansion
valve
CN4 connect to Electric Expansion Valve A
CN2 connect to Electric Expansion Valve B
CN34 connect to Electric Expansion Valve C
CN5 connect to Electric Expansion Valve D
3
S-A CN10
S: connect to indoor unit communication(pin1-pin2: 24VDC Pulse wave; pin2-pin3: 208-230V AC input)
S-B CN13
S-C CN3
S-D CN15
4 HEAT_D CN21/CN36 connect to chassis heater, 208-230V AC when is ON
5 4-way CN38 connect to 4 way valve, 208-230V AC when is ON.
6 HEAT_Y CN8/CN20 connect to compressor heater, 208-230V AC when is ON
7 T2B CN28 connect to evaporator coil outlet temperature sensor T2B
8 T3 T4 TP CN26 connect to pipe temp. sensor T3, ambient temp. sensor T4, exhaust temp. sensor TP
9 OLP TEMP. SENSOR CN30 connect to compressor top temp. sensor (5VDC Pulse wave)
10 H-PRO,L-RPO CN29 connect to high and low pressure swtich(pin1-pin2&pin3-pin4:5VDC pulse wave)
11 TESTPORT CN24 used for testing
12 / CN27 connect to key board CN1
Figure 39
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