Panasonic U-100PEY1E5, Technical Data & Service Manual

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5-50
5
The socket of the high pressure switch is securely inserted in the
PC board. The wiring is not opened.
1-1
1-2
Correct connection
and/or wiring
Yes
No
Even if parts near the high pressure switch are shaken quite a lot,
the high pressure cutoff will be activated.
Even if the covering is in good condition, in several cases vibration
has caused wiring inside to open.
1-2
Replace the
high pressure
switch (wiring)
2-1
Yes
No
1 High
pressure
switch
Service valve inside the outdoor unit closed 2-1
Open the service
valve
2-2
Yes
No
There is an extreme difference in temperature in/out of the service
valve.
2-2
2-3
3-1
Yes
No
Check the flare connection, someone may have forgotten to remove the bonnet.
If there is a problem within the service valve, replace the valve.
2-3
While cooling is operating an alarm is occurred. 3-1
3-2
3-5
Yes
No
The intake temperature (ambient temperature) of the outdoor unit’s
heat exchanger is above 46°C.
3-2
Prevent air short
circuit
3-3
Yes
No
The outdoor unit’s heat exchanger is clogged. 3-3
Clean the heat
exchanger
3-4
Yes
No
Check whether the outdoor unit fan is normal or if the sockets are
firmly pressed onto the plugs on the outdoor PC board, as well as
if any wiring is opened.
Are these checking finished without fail?
3-4
4-1
Replace the outdoor
unit fan.
Correct connection
and/or wiring
Yes
No
While heating is operating an alarm is occurred. 3-5
3-6
4-1
Yes
No
2 Service
valve
3 Problem
around the
heat
exchanger
P04 High Pressure Trouble
Error Detection Method
Error Diagnosis
It is judged an error if the internal circuit of the high pressure switch is dead.
The electronic circuitry of the high pressure switch is cut off if the pressure at the pressure sensor port of the high pressure
switch reaches 3.80 MPa. Once it is cut off, it remains cut off until the pressure drops to 3.15 MPa.
The high pressure switch is malfunctioning.
•
Service valve inside the outdoor unit closed
•
There is a short air circuit through the outdoor unit’s heat exchanger. (when cooling)
•
The outdoor unit’s fan is broken. (when cooling)
•
The outdoor unit’s heat exchanger is clogged. (when cooling)
•
There is a short air circuit at the indoor unit. (when heating) •
The filter of the indoor unit is clogged. (when heating) •
The fan of the indoor unit is broken or the fan motor is malfunctioning. (when heating) •
The refrigerant circuit is closed and the high pressure is increasing abnormally high.
(solenoid valve or expansion valve not activated, a stuck check valve, etc.) •
Refrigerant overcharged. •
Nitrogen or air contaminated in the refrigerant system •
1.
2.
SM830211-07̲PAC-i.indb 50 SM830211-07̲PAC-i.indb 50 2013/09/07 10:42:30 2013/09/07 10:42:30