Mitsubishi Electric CITY MULTI PUMY-P112VKM6 Service Manual page 31

8 TROUBLESHOOTING
8-1. Checkpoints for test run
8-1-1. Procedures before test run
1. Before a test run, make sure that the following work is completed.
• Installation related:
Make sure that the panel of cassette type is installed and electrical wiring is done.
Otherwise electrical functions like auto vane will not operate normally.
• Piping related:
Perform leakage test of refrigerant and drain piping. Make sure that all joints are perfectly insulated.
Check stop valves on both liquid and gas sides are fully open.
• Electrical wiring related:
Check ground wire, transmission cable, remote controller cable, and power supply cable for secure connection.
Make sure that all switch settings of address or adjustments for special specification systems are correctly made.
2. Safety check:
• With the insulation tester of 500V, inspect the insulation resistance.
• Do not touch the transmission cable and remote controller cable with the tester.
• The resistance should be over 1.0 MΩ. Do not proceed inspection if the resistance is less than 1.0 MΩ.
• Inspect between the outdoor unit power supply terminal block and ground first, metallic parts like refrigerant pipes
or the electrical box next, then inspect all electrical wiring of outdoor unit, indoor unit, and all linked equipment.
3. Before operation:
• For compressor protection, turn on the breaker for the outdoor unit and wait at least 12 hours before a test run.
• Register control systems into remote controller(s). Never touch the on/off switch of the remote controller(s). Refer to
˝Special function operation setting (for M-NET Remote Controller)˝ as for settings.
In MA remote controller(s), this registration is unnecessary.
4. More than 12 hours later after turning on the power to the outdoor unit, turn on all the power switches for the test run.
Perform test run and make test run reports.
8-1-2. Test run for M-NET remote controller
Refer to "Test run" for operation procedure.
OCH790 _31