5-21
5
The intake temperature (ambient temperature) of the indoor unit is
above 36°C.
3-6
Prevent air short
circuit
3-7
Yes
No
The filter of the indoor unit is clogged.
3-7
Clean the filter
3-8
Yes
No
The fan of the indoor unit is broken or the fan motor is faulty.
3-8
Replace the indoor
fan (motor)
4-1
Yes
No
Is the outdoor unit’s electronic control valve operating correctly?
(Check for debris clogging the electronic control valve, a problem
with the electronical coil and/or the control PC board.)
4-1
4-3
Repair the electronic
control valve of the
outdoor unit
Yes
No
If an alarm is occurred with the high pressure below 3.80 MPa,
with the pressure measured as displayed by the manifold gauge,
check the check valve in the compressor discharge line.
Are these checking finished without fail?
4-3
4-4
Replace the check
valve in the
compressor
discharge line
Yes
No
The electronic control valve is faulty.
In systems where the solenoid valve kits and the ice thermal
storage tank are connected, check these solenoid valves.
4-4
Replace the
electronic control
valve and/or
solenoid valve.
5-1
Yes
No
The indoor unit’s expansion valve is operating correctly.
(check for debris clogging the valve, a problem with the electronical
coil and/or the control PC board)
4-2
4-3
Repair the expansion
valve of the indoor
unit
Yes
No
3 Problem
around the
heat
exchanger
4 Blockage
in the
refrigerant
circuit
Error occurs when the system is operating in cooling mode.
5-1
5-3
5-2
Yes
No
An alarm is occurred with the high pressure at 3.80 MPa, with the
pressure measured either as displayed by the monitoring software
or with a manifold gauge, at which time the temperature of liquid in
the outdoor unit’s heat exchanger is detected to be at the
temperature of the outside air.
5-3
5-5
Contact the service
representative
Yes
No
An alarm is occurred with the high pressure at 3.80 MPa, with the
pressure measured either as displayed by the monitoring software
or with a manifold gauge, at which time the temperature of liquid in
the indoor heat exchanger is detected to be at room temperature
(intake temperature).
5-4
5-5
Contact the service
representative
Yes
No
The system may be overcharged. Check how much refrigerant was added during installation.
When a system is inspected for airtightness, it is seldom that enough nitrogen has been
expelled, so some remains in the circuit.
In this case, it is necessary to collect the refrigerant and then recharge the system.
5-5
Error occurs when the system is operating in heating mode.
5-2
5-4
5-5
Yes
No
5
Overcharging
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