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Outdoor Unit
8
Earthing
WARNING
Be sure to connect the earth wire. (Grounding work)
Incomplete earthing may cause an electric shock.
Connect the earth wire properly following applicable
technical standards.
Connecting the earth wire is essential to preventing
electric shock and to reducing noise and electrical
charges on the Outdoor Unit surface due to the high-
frequency wave generated by the frequency converter
(inverter) in the Outdoor Unit.
If you touch the charged Outdoor Unit without an earth
wire, you may experience an electric shock.
9
Finishing
After the refrigerant pipe, Hydro / Outdoor connecting
wires have been connected, cover them with finishing
tape and clamp them to the wall with off-the-shelf
support brackets or their equivalent.
Keep the power wires and Hydro / Outdoor connecting
wires off the valve on the gas side or pipes that have
no heat insulator.
10
Test run
• Turn on the leakage circuit breaker at least 12 hours
before starting a test run to protect the compressor
during startup.
• Check the following before starting a test run:
• That all pipes are connected securely without
leaks.
• That the valve is open.
If the compressor is operated with the valve
closed, the Outdoor Unit will become
overpressurized, which may damage the
compressor or other components.
If there is a leak at a connection, air can be sucked in
and the internal pressure further increases, which may
cause a burst or injury.
• Operate the Air to Water Heat Pump in the correct
procedure as specified in the Owner's Manual.
Please refer to the Hydro Unit installation manual for
the detail of the test run.
33-EN
11
Annual
maintenance
• For an Air to Water Heat Pump system that
is operated on a regular basis, cleaning and
maintenance of the Hydro / Outdoor Units are
strongly recommended.
As a general rule, if an Hydro Unit is operated for
about 8 hours daily, the Hydro / Outdoor Units will
need to be cleaned at least once every 3 months.
This cleaning and maintenance should be carried out
by a qualified service person.
Failure to clean the Hydro / Outdoor Units regularly
will result in poor performance, icing, water leaking
and even compressor failure.
12
Air to Water Heat
Pump operating
conditions
For proper performance, operate the Air to Water Heat
Pump under the following temperature conditions:
<HWT-40, 60>
Cooling operation
10 °C to 43 °C
Heating operation
–20 °C to 25 °C
Hot water operation
–20 °C to 43 °C
<HWT-80, 110, 140>
Cooling operation
10 °C to 43 °C
Heating operation
–20 °C to 25 °C
Hot water operation
–20 °C to 43 °C
If Air to Water Heat Pump is used outside of the above
conditions, safety protection may work.
– 17 –
13
Functions to be implemented locally
■ Handling existing pipe
When using the existing pipe, carefully check for the following:
• Wall thickness (within the specified range)
• Scratches and dents
• Water, oil, dirt, or dust in the pipe
• Flare looseness and leakage from welds
• Deterioration of copper pipe and heat insulator
Cautions for using existing pipe
• Do not reuse a flare nut to prevent gas leaks.
Replace it with the supplied flare nut and then process it to a flare.
• Blow nitrogen gas or use an appropriate means to keep the inside of the pipe clean. If discolored oil or much
residue is discharged, wash the pipe.
• Check welds, if any, on the pipe for gas leaks.
When the pipe corresponds to any of the following, do not use it. Install a new pipe instead.
• The pipe has been opened (disconnected from Hydro Unit or Outdoor Unit) for a long period.
• The pipe has been connected to an Outdoor Unit that does not use refrigerant R22, R410A or R407C.
• The existing pipe must have a wall thickness equal to or larger than the following thicknesses.
Reference outside
Wall thickness (mm)
diameter (mm)
Ø6.4
Ø12.7
Ø15.9
• Do not use any pipe with a wall thickness less than these thicknesses due to insufficient pressure capacity.
0.8
0.8
1.0
Installation Manual
34-EN
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