Daikin SkyAir Service Manual page 242

SiBE28-804
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
In heating operation
Troubleshooting
Check items (Possible causes)
Does the outdoor unit fan run normally?
Is the indoor unit 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 indoor unit installed under such conditions
that short circuit easily occurs?
Is the refrigerant gas short?
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?
Troubleshooting by Remote Controller Display / LED Display
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.
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