Bosch Climate 5000 Series Service Manual page 48

Service Manual
Index 1:
1. Indoor or Outdoor DC Fan Motor (control chip is in fan motor)
Power on and when the unit is in standby, measure the voltage of pin1-pin3,
pin4-pin3 in fan motor connector. If the value of the voltage is not in the
range showing in below table, the PCB must have problems and needs to be
replaced.
1 2 3
Red Black
Figure 42
DC motor voltage input and output (voltage: 220-240V~)
NO. Color
1 Red
2 ---
3 Black
4 White
5 Yellow
6 Blue
Table 25
DC motor voltage input and output (voltage :115V~)
NO. Color
1 Red
2 ---
3 Black
4 White
5 Yellow
6 Blue
Table 26
2. Outdoor DC Fan Motor (control chip is in outdoor PCB)
Release the UVW connector. Measure the resistance of U-V, U-W and V-W. If
the three values are not equal, the fan motor has a problem and needs to be
replaced.
Otherwise, replace the ODU PCB.
4 8 |
4 5 6
White Yellow Blue
Signal Voltage
Vs/Vm 280V~380V
--- ---
GND 0V
Vcc 14-17.5V
Vsp 0~5.6V
FG 14-17.5V
Signal Voltage
Vs/Vm 140V~190V
--- ---
GND 0V
Vcc 14-17.5V
Vsp 0~5.6V
FG 14-17.5V
Bosch Wall Mounted Ductless Split Air Conditioner / Heat Pump IDU-ODU - BTC 769102301 A (11.2022)
3. Indoor AC Fan Motor
a. Power off and disconnect fan motor power cord from PCB. Measure the
resistance value of each winding by using the multi-meter. The normal
value show as follows:
YKFG-13-4-38L
Model
YKFG-13-4-
38L-4
Brand Welling
Black - Red Main 345Ω
Blue - Black AUX 348Ω
Table 27
YKFG-20-4-
Model
5-19
Brand Welling
Black - Red Main 444Ω
Blue - Black AUX 470Ω
Table 28
YKFG-45-4-22
Model YKFG-45-4-13
Brand Dongfang
Black - Red Main 125.2Ω
Blue - Black AUX 83.8Ω
Table 29
Model
Brand
Black - Red Main
Blue - Black AUX
Table 30
b. Power on and set the unit running in fan mode at high fan speed. After
running for 15 seconds, measure the voltage of pin1 and pin2. If the
value of the voltage is less than 1 OOV(208-240V power supply) or
50V (115V power supply), the PCB must has problems and need to be
replaced.
Input Terminal
Red
Black
White
Figure 43
YKFG-15-4- YKFG-20-4- YKFG-20-4-
28-1 1 0L 5-11
Welling Welling Welling
75Ω 269Ω 388Ω
150Ω 224Ω 360Ω
YKFG-28-4-3-7
YKFG-25-4- YKFG-28-
YKFG-28-4-
6-14 4-6-5
3-14
Welling Welling Welling
287Ω 231Ω 183.6Ω
409Ω 414Ω 206Ω
YKFG-60-4-2-6 YKFG-60-4-1
YKFG-45-4-
22-13
Welling Welling Welling
168Ω 96Ω 68Ω
141Ω 96Ω 53Ω
YKFG-45-4-13
Dongfang
450Ω
442Ω
Red
White
Black