Mitsubishi Electric PURY-100TMU, Service Handbook

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TEST RUN
[1] Before Test Run
(1) Check points before test run
1 Neither refrigerant leak nor loose power source/ transmission lines should be found, if found correct immediately.
2 Confirm that the resistance between the power source terminal block and the ground exceeds 2M
Ω
by measur-
ing it with a DC500V megger. Do not run if it is lower than 2M
Ω
.
Note : Never apply the megger to the MAIN board. If applied, the MAIN board will be broken.
3 Confirm that the Ball valve at both gas and liquid sides are fully opened.
Note : Close the cap.
4 Be sure that the crankcase heater has been powered by turning the main power source on at least 12 hours
before starting the test run. The shorter powering time causes compressor trouble.
(2) Caution at inverter check
Because the inverter power portion in outdoor unit electrical part box have a lot of high voltage portion, be sure to follow
the instructions shown below.
During energizing power source, never touch inverter power portion because high voltage (approx. 580V) is
applied to inverter power portion.
When checking,
Shut off main power source, and check it with tester, etc.
Allow 10 minutes after shutting off main power source.
Open the MAIN board mounting panel, and check whether voltage of both ends of electrolytic capacitor is
20V or less.
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