Test Run - Mitsubishi Electric CIty MULTI Installationshandbuch

8. Test run

Before commencing a test run please check the follow-
ing:
 After installing, piping and wiring the indoor units and HBC controllers,
check to see again that there is no refrigerant leakage, water leakage, the
indoor unit inlet and outlet piped backwards, and no slack on power and
control cables.
(Error code 5102 will appear on the remote controller if a test run is per-
formed with the pipe-work installed incorrectly (inlet connected to outlet
and vice versa).)
 Use a 500 V tester to check that there is an insulation resistance of more
than 1.0 MΩ between the power terminal block and the ground. If it is less
than 1.0 MΩ, do not operate the unit.
• When water has been supplied to the water pipework, purge the system of air.
The details of air purging can be found separately in the water circuit mainte-
nance manual.
Caution:
• Never measure the insulation resistance of the terminal block for any con-
trol cables.
• Incomplete purging of the air in the system, closing of the valves upstream
or down stream of the pump etc. may cause the pump to operate with no
water flow and thus lead to pump failure.
• Ensure that the power is off when replacing a pump. Do not remove or
attach the pump connector with the power on. Otherwise pump will break.
After turning off the power, wait 10 minutes before commencing work.
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