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Troubleshooting for Outdoor Unit (50/60 class)
Si21-205
226
Troubleshooting
7.16.10Capacitor Voltage Check
Check No.12
Before this checking, be sure to check the main circuit for short-circuit.
Checking the capacitor voltage
With the circuit breaker still on, measure the voltage according to the drawing of the model in
question. Be careful never to touch any live parts.
7.16.11Power Transistor Check
Check No.13
Checking the power transistor
Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
If unavoidably necessary to touch a live part, make sure the power transistor's supply
voltage is below 50 V using the tester.
For the UVW, make measurements at the Faston terminal on the board or the relay
connector.
Fan motor
lead wire
Solenoid valve
lead wire
Thermistor
lead wire
OL
lead wire
Reactor
lead wire
Compressor
lead wire
TB2
>PS<
TB3
P2
N1
590
592
593
580
520
521
522
540
(R2858)
Use the tester
in the DC range.
Tester's negative terminal
Power transistor
(+)
UVW
Power transistor
(–)
UVW
Tester's positive terminal
UVW
Power transistor
(+)
UVW
Power transistor
(–)
Normal resistance
Several kohms to several Mohms
Abnormal resistance
0 or
∞
Summary of Contents for Sky Air B-Series R-410A
Page 7: ...Si21 205 vi Table of Contents ...
Page 15: ...Models Si21 205 4 Model Name and Power Supply ...
Page 16: ...Si21 205 Functions 5 Part 2 Functions 1 List of Functions 6 ...
Page 35: ...Wireless Remote Controller Si21 205 24 Remote Controller ...
Page 79: ...Settings Concerning Maintenance Si21 205 68 Field Setting Detail of PCB 2 ...
Page 83: ...Maintenance Mode Setting Si21 205 72 Field Setting ...
Page 239: ...Troubleshooting for Outdoor Unit 50 60 class Si21 205 228 Troubleshooting ...
Page 321: ...Outdoor Unit 50 60 class Si21 205 310 Removal Procedure ...