Installation
26 Air-to-Water Heat Pump
Circuit breaker specification
• Select a power source that is capable of supplying the current required by the unit.
• Use a recognized circuit breaker between the power source and the unit.
A disconnection device to adequately disconnect all supply lines must be fitted.
• Capacity of circuit breaker recommended.
• Separate main power supply and heater supply.
After checking and confirming following conditions, start wiring work.
1. Secure dedicated power source for the Air-to-Water heat pump. The wiring diagram (attached
inside the panel of the unit) is presenting related information.
2. Provide a circuit breaker switch between power source and the unit.
3. Although it is very rare case, sometimes the screws used to fasten internal wires can be loosen
due to the vibration while unit transportation. Check these screws and make it sure if they are
all fastened tightly. If not tightened, burn-out of the wire can be occurred.
4. Check the specification of power source such as phase, voltage, frequency, etc.
5. Confirm that electrical capacity is sufficient.
6. Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage
marked on the name plate.
7. Confirm that the cable thickness is as specified in the power sources specification. (Particularly
note the relation between cable length and thickness.)
8. Provide an ELB(electric leakage breaker) when the installation place is wet or moist.
9. The following troubles would be caused by abnormal voltage supply such as sudden voltage
increasing or voltage drop-down.
• Chattering of a magnetic switch (frequent on and off operation)
• Physical damage of parts where magnetic switch is contacted
• Break of fuse
• Malfunction of overload protection parts or related control algorithms.
• Failure of compressor start up
• S/Heater : Sanitary water tank heater
• FLA : Full load ampere
• MOP : Maximum rating of overcurrent protective device
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