Check No.6 - Evaluation Of Abnormal High Pressure - Daikin ESIE13-02 Service Manual

Additional Checks for Troubleshooting
6.6

Check No.6 - Evaluation of Abnormal High Pressure

1
In cooling operation
3
4
5
In heating operation
Part 4 – Troubleshooting
Abnormally high pressure level is mostly caused by the condenser side. The following contents are
provided by service engineer based on their field checks. Further, the number is listed in the order of
degree of influence.
Check items (Possible causes)
Does the outdoor unit fan run normally?
Is the outdoor unit heat exchanger clogged?
Is there clogging before or after the EV
(capillary)?
Is the check valve clogged?
*Heat pump model only
Is the HPS normal?
Is the outdoor unit installed under such
conditions that short circuit easily occurs?
Is the piping length 5 meters or less?
Does air enter the refrigerant system?
Is the refrigerant overcharged?
Check items (Possible causes)
Is the hydro-box heat exchanger clogged?
Is there clogging before or after the EV
(capillary)?
Is the check valve clogged?
Is the HPS normal?
Is the piping length 5 meters or less?
Does air enter the refrigerant system?
Is the refrigerant overcharged?
Judgment
Visual inspection
Visual inspection
Check if there is a temperature difference
before and after EV (capillary).
Check if the main valve unit of EV operates (by
noise, vibration).
Check if there is a temperature difference
before and after check valve.
If YES, the check valve is caught.

Check continuity by using a tester.
Visual inspection
Visual inspection
Conduct refrigerant collection and vacuum
drying, and then add proper amount refrigerant.
Conduct refrigerant collection and vacuum
drying, and then add proper amount refrigerant.
Judgment
Visual inspection
Check if there is a temperature difference
before and after EV (capillary).
Check if the main valve unit of EV operates (by
noise, vibration).
Check if there is a temperature difference
before and after check valve.
If YES, the check valve is caught.

Check continuity using a tester.
Visual inspection
Conduct refrigerant collection and vacuum
drying, and then add proper amount refrigerant.
Conduct refrigerant collection and vacuum
drying, and then add proper amount refrigerant.
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ESIE13-02