Daikin LXE10E-A Service Manual page 117

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(1) Operation Pressure Check
Check high pressure from the service port w
on the compressor discharge. Check low
pressure from the service port q on the
compressor suction.
w
q
(2) Recovery non-condensable gas
If air or other non-condensable gas exists in
the refrigerant circuit, it is accumulated in the
condenser, which raises pressure in the
condenser abnormally high and reduces the
heat transfer ratio of the condenser surface
resulting in a decrease of the refrigerating
capacity. It is, therefore, very important to
remove non-condensable gas.
If the discharge pressure is abnormally high
and does not return to the normal pressure,
inspect if air or any other non-condensable
gas exists by the following procedure.
●Conduct automatic pump down operation
and stop the unit after collecting the
refrigerant into the liquid receiver.
Run the condenser fan by using the
condenser fan check in the manual check
functions, and wait untill the condenser
cooling air inlet/outlet temperatures
become equal. If there is any difference
between the saturated pressure
corresponding to cooling air temperature
and condensing pressure, then non-
condensable gas exists. In this case,
recover non-condensable gas as stated
below.
qConduct automatic pump down
wThen collect the gas from the service port
w on the compressor discharge side.
eReading the pressure gauge, collect the
non-condensable gas repeatedly until
condensing pressure equals saturated
pressure.
LP HP
4-6
(3) Refrigerant Recovery
qOperate Automatic Pump Dpwn.
wRecover refrigerant from port t.
eRecover completely refrigerant left in the
unit from ports r & t.
r
(4) Vacuum-dehydrating, and refrigerant /
charging
If all the refrigerant has leaked out and air is
intermixed in the refrigeration circuit, remove
the cause of trouble and carry out vacuum-
dehydrating. Then charge the specified
amount of refrigerant.
[Required tools]
1. Refrigerant cylinder (content of 20kg)
equipped with joint for HFC134a
2. Gauge manifold with quick joints
3. Weighing scale (up to 50kg)
4. Vacuum pump
t
t