Test Run; Before Test Run - Mitsubishi Electric CITY MULTI PQRY-P200YMF-C Service Handbook

3 3 3 3 3 TEST RUN

[1] Before Test Run

(1) Check points before test run
Neither refrigerant leak nor loose power source/ transmission lines should be found.
1
Confirm that the resistance between the power source terminal block and the ground exceeds 2MΩ by measur-
ing it with a DC500V megger. Do not run if it is lower than 2MΩ.
2
Note) Never apply the megger to the MAIN board. If applied, the MAIN board will be broken.
Confirm that the Ball valve at both gas and liquid sides is being fully opened.
3
Note) Certainly close the cap.
Be sure that the crankcase heater has been powered by turning the main power source on at least 12 hours
4
before starting the test run. The shorter powering time causes compressor trouble.
(2) Caution at inverter check
Because the inverter power portion in heat source 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
1
applied to inverter power portion.
When checking,
1
Shut off main power source, and check it with tester, etc.
2
Allow 10 minutes after shutting off main power source.
2
Open the MAIN board mounting panel, and check whether voltage of both ends of electrolytic capacitor is
3
20V or less.
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