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Si21-205
Troubleshooting for Outdoor Unit (25/35 class)
Troubleshooting
193
6.15.10Capacitor Voltage Check
Check No.12
< Measuring method >
Before measuring, operate the unit for several minutes, then shut down the operation by force
using the circuit breaker.
If the unit is shut down using the remote controller instead of the circuit breaker, the
capacitor discharges the electric load, thus disallowing accurate measurement.
Note:
The charge section is applied with high voltage. Therefore, exercise caution during
measurement to prevent electric shock.
< Measuring positions >
Take measurements at the power transistor (+) and (-) terminals in the same way as described
in section 1.
Set the multi-tester to DC and VOLTAGE RANGE before measurement.
∗
Since capacitor (+) and (-) are connected to power transistor (+) and (-), capacitor voltage
can be measured at the power transistor (+) and (-) terminals.
6.15.11Power Transistor Check
Check No.13
Note:
Check to make sure that the voltage between the terminal of Power transistor (+) and (-) is
approx. 0 volt before checking power transistor.
< Measuring method >
Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
connector, press the protrusion on the connector.
Then, follow the procedure below to measure resistance between power transistor (+) and (-)
and the U, V and W terminals of the compressor connector with a multi-tester. Evaluate the
measurement results for a pass/fail judgment.
<Power transistor check>
Negative (-) terminal of
tester (positive terminal
(+) for digital tester)
Power transistor
(+)
UVW
Power transistor
(-)
UVW
Positive (+) terminal of
tester (negative terminal
(-) for digital tester)
UVW
Power transistor
(+)
UVW
Power transistor
(-)
Normal resistance
Several k
Ω
to several M
Ω
(
∗
)
Unacceptable resistance
Short (0
Ω
) or open
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 ...