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Mitsubishi Electric CAHV-P500YA-HPB Instruction Manual page 14

Air-cooled heat pump unit cahv series
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Cont'd
Check that the evaporating
temperature is in the normal range.
Compressor
Check that the operating current is
normal.
Check for abnormal sounds and
vibrations.
Check that the compressors are
not short-cycling.
Protection
Check that the high-pressure
devices
switch operates normally.
(Biannual)
Check that the pump interlock
circuit operates normally.
Electrical
Check for loose terminal screws.
system
Check that all electrical contacts
(Biannual)
are clean.
Check that the conductors and
relays are operating normally.
Check that the insulation resistance
of the operation circuit is normal.
Check that the insulation resistance
of the main circuit is normal.
Check that the ground wire is
properly connected.
Check that all wires are connected
properly.
Heating-
Check that the heating-water is
water
clean.
system
Check that the water pressure is
normal.
Check for water leakage.
Check that the water in the pump
does not drain back when the
pump stops.
Check that air is not trapped in the
water-side heat exchanger or
pipes.
Check that the voltage and current
of the heating-water pump operates
normally.
Check that the heating-water
volume is normal.
Check that the heating-water
quality meets the quality standards.
Air-side
Check the fins and other parts for
heat
corrosion.
exchanger
(Biannual)
Check that the fins are not dirty.
While heating water, use the temperature
reading of the sensor on the air-side heat
exchanger inlet pipe as the evaporating
temperature.
Intake temperature: -3 – +8 K
Compare the operating current against the
rated current.
Visual
Check that no foreign objects are caught in
inspection
the unit.
Check that the interval between the time
when the compressor starts up and the time
when it restarts is at least 10 minutes.
Screwdriver
Visual
inspection
500 V
Min. 5 MΩ
ohmmeter
500 V
Min. 10 MΩ
ohmmeter
Visual
inspection
Screwdriver
Check the strainer in the heating-water line.
Max. 1.0 MPa
Visual
inspection
Open the air vent valve to see if any air
comes out.
See the Quality Standards for Heating and
Makeup Water table below.
Visual
inspection
Visual
Clean the fins if the high pressure has
inspection
dropped by 0.1 MPa or more compared to
the initial value. (To be measured under the
same conditions as at the time of
installation)
14/20

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