49
ELECTRICAL WIRING
ENGLISH
CAUTION
!
After checking and confirming following conditions, start wiring work.
• Secure dedicated power source for the Air-to-Water heat pump. The wiring diagram (attached
inside the control box of the unit) is presenting related information.
• Provide a circuit breaker switch between power source and the outdoor unit.
• Although it is very rare case, sometimes the screws used to fasten internal wires can be
loosen due to the vibration while product 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.
• Check the specification of power source such as phase, voltage, frequency, etc.
• Confirm that electrical capacity is sufficient.
• Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage
marked on the name plate.
• Confirm that the cable thickness is as specified in the power sources specification.
(Particularly note the relation between cable length and thickness.)
• Provide an ELB(electric leakage breaker) when the installation place is wet or moist.
• 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
• Ground wire to ground outdoor unit to prevent electrical shock.
Point for attention regarding quality of the public electric power supply
- European/International Technical Standard setting the limits for voltage changes, voltage fluctuations
and flicker in public low-voltage supply systems for equipment with rated current ≤ 75 A.
- European/International Technical Standard setting the limits for harmonic currents produced by
equipment connected to public low-voltage systems with input current ≤16 A of > 75 A per phase.
The Outdoor unit
This equipment complies with IEC (EN) 61000-3-12 in harmonic currents emission limits
corresponding Rsce =33.
This equipment complies with IEC (EN) 61000-3-3.
The Indoor unit
This equipment complies with IEC (EN) 61000-3-2.
This equipment complies with IEC (EN) 61000-3-12 in harmonic currents emission limits
corresponding Rsce =33.
This equipment complies with IEC (EN) 61000-3-3.
This device is intended for the connection to a power supply system with a maximum
permissible system impedance Z
MAX
of 0.4305 Ω at the interface point (power service box) of the
user’s supply. The user has to ensure that this device is connected only to a power supply
system which fulfills the requirement above. If necessary, the user can ask the public power
supply company for the system impedance at the interface point.
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