Daikin SkyAir RZQ200 · 250C7Y1B Service Manual page 185

Diagnosis by Remote Controller
Check No. 3 If the high pressure is abnormally high
Conception
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.
a In cooling operation
Check items (Possible causes)
1. Does the outdoor unit fan run normally?
2. Is the outdoor unit heat exchanger
3. Is there clogging before or after the EV
4. Is the check valve clogged?
5. Is the HPS normal?
6. Is the outdoor unit installed under such
7. Is the piping length 5 meters or less?
8. Does air enter the refrigerant system?
9. Is the refrigerant overcharged?
a. In heating operation
Check items (Possible causes)
1. Does the indoor unit fan run normally?
2. Is the indoor unit heat exchanger
3. Is the indoor unit installed under such
4. Is there clogging before or after the EV
5. Is the check valve clogged?
6. Is the HPS normal?
7. Is the piping length 5 meters or less?
8. Does air enter the refrigerant system?
9. Is the refrigerant overcharged?
174
clogged?
(capillary)?
conditions that short circuit easily
occurs?
clogged?
conditions that short circuit easily
occurs?
(capillary)?
Judgment
1. Visual inspection
2. Visual inspection
3. Check if there is a temperature
difference before and after EV
(capillary).
Check if the main valve unit of EV
operates (by noise, vibration).
4. Check if there is a temperature
difference before and after check valve.
→
If YES, the check valve is caught.
5. Check continuity by using a tester.
6. Visual inspection
7. Visual inspection
8. Conduct refrigerant collection and
vacuum drying, and then add proper
amount refrigerant.
9. Conduct refrigerant collection and
vacuum drying, and then add proper
amount refrigerant.
Judgment
1. Visual inspection
2. Visual inspection
3. Visual inspection
4. Check if there is a temperature
difference before and after EV
(capillary).
Check if the main valve unit of EV
operates (by noise, vibration).
5. Check if there is a temperature
difference before and after check valve.
→
If YES, the check valve is caught.
6. Check continuity using a tester.
7. Visual inspection
8. Conduct refrigerant collection and
vacuum drying, and then add proper
amount refrigerant.
9. Conduct refrigerant collection and
vacuum drying, and then add proper
amount refrigerant.
SiBE26-701
Troubleshooting