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Check Points, Maintenance and Troubleshooting
Test Run
After professional installation, the authorized contractor has to perform the commissioning of the device.
The commission can only be performed by a person authorized by the manufacturer! If the com-
mission is performed by an unauthorized person, the warranty is not recognized.
Management of the device must be performed in accordance with current instructions for use.
Check before Test run
Check to see whether there is any refrigerant leakage, and check whether the power or
1
transmission 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.
2
During test operation in winter, it will drive the heating operation focused.
Before cooling test operation, to concern freezing of the plate heat exchanger, performing
the cooling test operation after raising the water temperature up to 30℃ in the heating
mode.
Limiting concentration
Limiting concentration is the limit of Freon gas concentration where immediate measures can be
taken without hurting human body when refrigerant leaks in the air. The limiting concentration shall
be described in the unit of kg/m
n Calculate refrigerant concentration
Refrigerant concentration =
62 Air-to-Water Heat Pump
Otherwise the control board may break.
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 termi-
nal board and the ground may decrease to approx. 2.0 MΩ as a result of refrig-
erant accumulation in the internal compressor.
If the insulation resistance is less than 2.0 MΩ, turn on the main power supply.
3
(Freon gas weight per unit air volume) for facilitating calculation
Limiting concentration: 0.44kg/m
Total amount of replenished refrigerant in refrigerant facility (kg)
Capacity of smallest room where indoor unit is installed (m
3
(R410A)
3
)
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