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3. Test Run
1. Check before Test Run
Check to see whether there is any refrigerant leakage, and check whether the power or transmission
1
cable is connected properly.
Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and
ground. Do not operate in the case of 2.0 MΩ or less.
NOTE: Never carry out mega ohm check over terminal control board.
Otherwise the control board may break.
2
Immediately after mounting the unit or after leaving it turned off for an extended length of
time, the resistance of the insulation between the power supply terminal board and the
ground may decrease to approx. 2.0 MΩ as a result of refrigerant accumulation in the inter-
nal compressor.
If the insulation resistance is less than 2.0 MΩ, turn on the main power supply.
2. Test Run Flow chart
START
Operate the unit in heating mode.
Does Test operation start?
Yes
Is cold water discharged for
more than 3 minutes ?
Yes
Is there any temperature
difference between intake and
discharged water?
Yes
Operation mode change
to Heating mode
Is hot water discharged ?
Yes
Normal
No
Check whether the power cable and
communication cable are completely connected
No
* Check the load (In/Out Temp.)
* Check pipe length and amount of
refrigerant
* Check for abnormal sound in
No
outdoor unit (comp.,Fan, others )
* Refer to Troubleshooting Guide
No
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Table of Contents
Troubleshooting
