Evaluation Of Abnormal High Pressure; In Cooling Operation - Daikin R71FUV1 Service Manual

Si20-701_B
CHECK 4

Evaluation of Abnormal High Pressure

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.

In cooling operation

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?
464
Troubleshooting by Remote Controller
Judgement
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.