ENGLISH-109
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3
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THERS
Inspection and test operation
Precautions before trial operation
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Check if the circulation water condition matches the K21/K22 setting of the outdoor unit option switch. (Refer
to 'Setting outdoor unit option switch and key function' on page 89)
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Make sure that water pipe facility work of the building is done appropriately.
- Especially, check the installation location of strainer, air discharge valve (air ventilation), auto water supply
valve, and expansion tank and make sure their location is appropriate.
- Pour enough water in the expansion tank and execute individual water pipe pump operation to discharge all
the air within the water pipe system.
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Measure the pressure loss at the inlet and outlet of the plate type heat exchanger to find out if there are
enough amount of heat source water flowing and supplied to the product.
- Check each models for sufficient amount of water flowing.
- When there is air or insufficient amount of water flowing, it may cause plate type heat exchanger to freeze.
- If the amount of water does not meet as planned, stop the operation and take appropriate counter-
measure.
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When the outdoor temperature is low, turn on the main power 6 hours before beginning the operation.
- If you start the operation immediately after turning on the main power, it may cause serious damage to the
part within the product.
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Do not touch the refrigerant pipe during or right after the operation.
- Refrigerant pipe may be hot or cold during or right after the operation depending on the status of the
refrigerant which flows through the refrigerant pipe, compressor and other parts of the refrigerant cycle. If
you touch the refrigerant during or right after the operation, you may get burns or frostbite.
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Do not operate the product with its panel or protection nets off.
- There is risk of personal injury from the parts that rotates, heated or with the high voltage.
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Do not cut off the main power right after stopping the operation.
- Wait for at least 5 minutes before turning off the main power. If not, water leakage or other problems may
occur.
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Connect all the indoor units and the power supply for the outdoor unit and run auto address setting. Run auto
address setting even after changing the indoor unit PCB.
CAUTION
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