Checking Non-Condensable Gas; Sight Glass - Daikin LX10F11B3 Service Manual

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4.4 Checking Non-Condensable Gas

If the air or other non-condensable gases are
present in the refrigerant system, they will gather
in the condenser and the pressure inside the
condenser will rise significantly.
In this case, recover all refrigerant and charge the
specified charge amount of refrigerant.
Confirm whether the air or other non-condensable
gas is present with following procedure.
(1) Collect refrigerant to condenser coil and
receiver by operating automatic pumpdown.
(2) Operate condenser fan using CFM ON/OFF
function in manual check and wait until the
air inlet and outlet temperature of condenser
becomes equal.
(3) Connect manifold gauges (High pressure
gauge) to port ④.
Non-condensable gas are present if the
corresponding saturation temperature of gauge
pressure is higher than the temperature of the
outdoor air.

4.5 Sight Glass

Sight glass shows moisture content in the refrigerant
and refrigerant flow rate.
Sight
Glass
(1) Moisture indication
Recover all refrigerant and recharge new
refrigerant if the sight glass indicates yellow as
excessive moisture may be contained in the
system.
Color
Green
Yellow
(2) Judgment for refrigerant flow rate, Normal or
Shortage?
Judge refrigerant flow rate when frozen mode only
under 0 ℃ .
Normal if full is indicated at RS < 0 ℃ .
Shortage if flashing is indicated at RS < 0 ℃ .
RS＜0℃
RS＜0℃
Do not judge shortage if flashing is
indicated at RS > 0℃ frozen mode and at
any range of chilled mode.
Judgment
As flashing here does not mean gas
shortage, do not charge with additional
Dry
refrigerant.
Wet
It is possibly caused by overcharging.
4-8
Frozen Operation
Full
Flashing
CAUTION
Judgment
Normal
Shortage