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12
How to exchange main parts
<Turn off the power breaker>
Because the electrical components are energized with high voltage, always turn off the power breaker before
starting to work.
<Check>
Ensure that no water pressure is present when replacing the water circuit (circulation pump, heater unit, flow switch, etc).
After a repair is complete, perform a test run (after attaching the front panel, upper and lower cabinets, and side cabinet)
and check that no abnormality including smoke or abnormal noise occurs. Failure to do so may cause a fire or an electric
shock. Place the cabinets before making a test run.
<Watch out for fire>
Observe the following instructions when repairing the refrigerant cycle.
(1) Watch out for surrounding fire. Always put out the fire of stove burner or other devices before starting the repair.
Should the fire fail to be put out, the oil mixed with refrigerant gas could catch fire.
(2) Do not use a welder in a closed room.
A room with no ventilation may cause carbon monoxide poisoning.
(3) Keep away flammable materials.
The materials may catch the fire of a welder.
<Wear gloves>
Wear gloves (∗) when performing repair.
Failure to do so may cause an injury when accidentally contacting the parts.
∗: Thick gloves such as cotton work gloves
1. Hydro Unit
No.
Exchange parts name
1
Common procedure
Front panel
Electrical control box
cover (lower)
Electrical control box
cover (upper)
Work procedure
Wear gloves when performing the work.
Failure to do so may cause an injury when
accidentally contacting the parts.
1. How to remove
1) Stop the hydro unit operation, and turn off the power
breaker.
2) Remove the front panel.
(ST1T Ø4 × 10, 6 screws)
3) After unscrew the screws, remove the front panel by
pulling it toward you.
4) Remove the electrical control box cover (lower).
(ST2T Ø4 × 8, 2 screws)
5) Disconnect the power source cable and outdoor unit
connecting cable from the terminal block.
6) Remove the electrical control box cover (upper).
(ST2T Ø4 × 8, 4 screws)
7) Disconnect the remote controller connecting cable
from the CN41 connector of the water heat
exchange board.
2. How to attach
1) Connect the remote controller connecting cable to
the water heat exchange board.
2) Attach the electrical control box cover (upper).
3) Connect the power source cable and outdoor unit
connecting cable to the terminal block, and fix with
the cord clamp.
4) Attach the electrical control box cover (lower).
5) Attach the front panel.
WARNING
CAUTION
181
Remarks
Front panel
Electrical control
box cover (lower)
Electrical control
box cover (upper)
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