High Pressure Check; Low Pressure Check - Daikin SkyAir RZF-A Series Service Manual

Check
6.2

High Pressure Check

CHECK 2 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.
Cooling
6.3

Low Pressure Check

CHECK 3 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.
Cooling
195
No. Check items (Possible causes)
1 Does the outdoor fan run normally?
2 Is the outdoor heat exchanger clogged?
Is there clogging before or after the electronic
expansion valve (capillary)?
3
4 Is the high pressure switch normal?
Is the outdoor unit installed under such
5
conditions that short circuit easily occurs?
Does air enter the refrigerant system?
6
Is the refrigerant overcharged?
7
No. Check items (Possible causes)
1 Does the indoor fan run normally?
2 Is the indoor unit filter clogged?
Is there clogging before or after the electronic
expansion valve (capillary)?
3
Is the indoor unit installed under such
4
conditions that short circuit easily occurs?
Is the refrigerant shortage?
5
Judgment
Visual inspection
Visual inspection
Check if there is a temperature difference before
and after electronic expansion valve (capillary).
Check if the main valve unit of electronic
expansion valve operates (by noise, vibration).
Check continuity by using a multimeter.
Visual inspection
Conduct refrigerant collection and vacuum drying,
and then recharge proper amount refrigerant.
Conduct refrigerant collection and vacuum drying,
and then recharge proper amount refrigerant.
Judgment
Visual inspection
Visual inspection
Check if there is a temperature difference before
and after electronic expansion valve (capillary).
Check if the main valve unit of electronic
expansion valve operates (by noise, vibration).
Visual inspection
Conduct refrigerant collection and vacuum drying,
and then recharge proper amount refrigerant.
Part 6 Service Diagnosis
SiME281906E