Sight Glass: Description and Operation

Checking Charged Refrigerant - Work Procedure Chart:

WORK PROCEDURE
The amount of refrigerant charged into the system can be observed through the sight glass by watching the flow of the refrigerant and by reading the high pressure and low pressure manifold gauges under the following conditions:

CONDITIONS
^ Doors: Close completely.
^ Window glasses: Close completely.
^ Intake door position: RECIRC
^ Mode door position: VENT
^ Blower fan: HI
^ TEMP control: Optional (Set so that intake air temperature is 30 to 35°C (86 to 95°F).
^ AIR CON switch: ON
^ Engine speed: Approx. 1,500 rpm

Sight Glass Chart:

CAUTION:
The condition of bubbles seen through the sight glass as well as the intake and discharge pressures are influenced by the ambient temperature, wind velocity, weather, and by the air temperature in front of the condenser, etc.