8. Test Run
Air-to-Water Heat Pump _ 20
Part 2. Desing and installation
8.3 Maintenance
To assure best performance of , it is required to perform periodical check and maintenance. It is
recommended to proceed following check list for once a year.
Turn off the power before proceeding maintenance
•
In normal state, the pressure gage (inside of the unit) should indicate 200~250 kPa.
•
If the pressure is less than 30 kPa, please recharge the water.
• Disassemble strainer. Then wash the strainer to make it clean.
• While disassembling the strainer, be careful for water flood out.
• Open the switch of the safety valve and check if water is flood out through the drain hose.
• After checking, close the safety valve.
• Look and inspect if there is loosen or defected connection on the terminal block.
No Category Item Check Point
Water
Electricity
Water pressure
Strainer(Water filter)
Safety valve
Terminal block wiring
1
2
3
4
1
Check to see whether there is any refrigerant leakage, and check whether the power or transmission
cable is connected properly.
2
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.
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 internal
compressor.
If the insulation resistance is less than 2.0 MΩ, turn on the main power supply.
8.4 Check before Test run
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