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MULTI V Water IV
11. Test Run
11.2 Precaution before test run
Check whether the air is completely removed and the water supply is flowing smoothly.
1
Check whether there is any refrigerant leakage of any disconnected or loose communication or power
wire, or use the electric wiring diagram to check the wiring connection condition.
2
Check whether the power and communication wire are connected.
Check whether the power cable R, S, T and N are correctly connected.
Check the insulation resistance with the DB mega tester device (DC 500V) between the power
terminal block and grounding, and check whether it is 2.0MΩ or above when measured.
If the resistance is 2.0MΩ or less, do not operate the product.
Precaution:
• Never check the insulation resistance for the terminal control board.
(The control board can be damaged.)
3
• If you leave the system turned off right after the installation or for a long period of time, the refrigerant
gets accumulated within the compressor and the insulation resistance reduces to less than 2 MΩ.
When the insulation resistance is 2 MΩ or less, turn on the power and let the electricity be supplied
to the crank case heater of the compressor and let the refrigerant including the oil inside the
compressor to evaporate.
Then the insulation resistance value will increase to more than 2.0 MΩ.
Check whether the liquid and gas pipes are open.
4
Precaution when blocking the water cooling type Multi V main power
• While using the product (Air conditioning season/Heating season), always connect the main power
of the outside unit.
• During the test run operation after installing the product or during the operation after blocking the
5
outside unit main power (Power outage etc.), you must always connect the power 6 hours prior to
heating the crank case heater. If the crank case is not preheated for more than 6 hours with the
electric heater, it can cause a burn on the compressor.
(Heating the bottom part of the compressor with the crank case heater is to evaporate the refrigerant
included in the oil inside the compressor.)
WARNING
•
Always check whether the water supply is flowing smoothly before the test run. (If sufficient amount of
water is not flowing, it can burn the product.)
•
During the initial test run after installing the product, leaving the product for more than 3 days or after
replacing the compressor, power must be connected 6 hours prior to the operation to heat the
compressor heater. (If the product is not heated sufficiently, it can burn the product.)
Heat Pump
Installation of Outside Units
49
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