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Components
Service manual
96
(C)(F)TXA15~50A(W)(S)(T) + (C)(F)TXA15~50B(B)(S)(T) + RXA42+50A +
RXA20~35A + RXA42+50B
Split Stylish R32
ESIE18-03C – 2020.02
3
Turn OFF the unit via the user interface.
4
Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure
the rectifier voltage is below 10 V DC before proceeding.
5
Disconnect the DC fan motor connector S70 and measure the resistance on
the connector pins shown below. The measured resistance MUST be:
VDC
Comm
Resistance
VDC
Comm
Resistance
4
1
OL
1
4
OL
4
2
108 kΩ
2
4
108 kΩ
4
3
1.2 kΩ
3
4
1.2 kΩ
4
7
OL
7
4
OL
DC fan motor resistance measurements
are correct?
Action
Yes
Continue with the next step.
No
97].
6
Turn ON the power of the unit.
7
With the DC fan motor connector S70 disconnected from the inverter PCB,
measure the voltage on the connector pins 4-7 (= fan motor power supply) on
the inverter PCB.
Result:
The voltage MUST be 200~390 V DC.
8
Measure the voltage on the connector pins 4-3 (= fan motor control) on the
inverter PCB.
Result:
The voltage MUST be 15±10% V DC.
Are both measured voltages correct?
Action
Yes
Continue with the next step.
No
Perform a check of the inverter PCB,
see
79].
9
Measure the voltage on the DC fan motor connector S70 pins 2-4 (= rotation
command) on the PCB.
Result:
The measured voltage should be 0~7 V DC. It should NOT be 0 V DC.
Is the measured voltage 0 V DC?
Action
Yes
Perform a check of the inverter PCB, see
79].
No
Continue with the next step.
10
Manually (slowly) rotate the fan blade propeller 1 turn and measure the
voltage on the DC fan motor connector pins 1-4. 4 pulses MUST be measured.
Summary of Contents for Stylish Series
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