DISCHARGING, EVACUATING, CHARGING AND CHECKING — Checking Refrigerant Level
HA-26spec tableChecking Refrigerant Level
CONDITION
IMPORTANT
Door window: Open. A/C switch: ON. TEMP. lever position: Max. COLD. FAN lever position: 4. Check sight glass after a lapse of about five minutes.
Refrigerant level — sight glass / temperature / pressure / repair table
Temperature of high-pressure and low-pressure lines.
Almost no refrigerantAlmost no difference between high-pressure and low-pressure side temperatures.
InsufficientHigh-pressure side is warm and low-pressure side is fairly cold.
SuitableHigh-pressure side is hot and low-pressure side is cold.
Too much refrigerantHigh-pressure side is abnormally hot.
State in sight glass.
Almost no refrigerantBubbles flow continuously. Bubbles will disappear and something like mist will flow when refrigerant is nearly gone. (AC256)
InsufficientThe bubbles are seen at intervals of 1 - 2 seconds. (AC257)
SuitableAlmost transparent. Bubbles may appear when engine speed is raised and lowered. No clear difference exists between these two conditions. (AC258)
Too much refrigerantNo bubbles can be seen.
Pressure of system.
Almost no refrigerantHigh-pressure side is abnormally low.
InsufficientBoth pressures on high and low-pressure sides are slightly low.
SuitableBoth pressures on high and low-pressure sides are normal.
Too much refrigerantBoth pressures on high and low-pressure sides are abnormally high.
Repair.
Almost no refrigerantStop compressor immediately and conduct an overall check.
InsufficientCheck for gas leakage, repair as required, replenish and charge system.
Suitable—
Too much refrigerantDischarge refrigerant from service valve of low-pressure side.
IMPORTANT
(a) The bubbles seen through the sight glass are influenced by the ambient temperature. Since the bubbles are hard to show up in comparatively low temperatures below 20°C (68°F), it is possible that a slightly larger amount of refrigerant would be filled, if supplied according to the sight glass. Recheck the amount when it exceeds 20°C (68°F). In higher temperature the bubbles are easy to show up.
(b) When the screen in the receiver drier is clogged, the bubbles will appear even if the amount or refrigerant is normal. In this case, the outlet side pipe of the receiver drier becomes considerably cold.