Check No.7 - Evaluation Of Abnormal Low Pressure - Daikin ESIE13-02 Service Manual

ESIE13-02
6.7

Check No.7 - Evaluation of Abnormal Low Pressure

Abnormally low pressure level is mostly caused by the evaporator side. The following contents are
provided based on field checking of service engineer. Further, the number is listed in the order of
degree of influence.
In cooling operation
Check items (Possible causes)
Does the outdoor unit fan run normally?
Is the hydro-box filter clogged?
Is there clogging before or after the EV
(capillary)?
Is the check valve clogged?
*Heat pump model only
Is the LPS normal?
Is the hydro-box installed under such conditions
that short circuit easily occurs?
Is the refrigerant gas short?
In heating operation
Check items (Possible causes)
Does the outdoor unit fan run normally?
Is the outdoor unit heat exchanger clogged?
Is the outdoor unit installed under such
conditions that short circuit easily occurs?
Is there clogging before or after the EV
(capillary)?
Is the check valve clogged?
Is the LPS normal?
Is the refrigerant gas short?
Additional Checks for Troubleshooting
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 using a tester.
Visual inspection
Conduct refrigerant collection and vacuum
drying, and then add proper amount refrigerant.
Judgment
Visual inspection
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 using a tester.
Conduct refrigerant collection and vacuum
drying, and then add proper amount refrigerant.
157 Part 4 – Troubleshooting
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