Komatsu ecot3 WA430-6 Operation & Maintenance Manual page 269

SERVICE PROCEDURE
CHECK AIR CONDITIONER
CHECK LEVEL OF REFRIGERANT (GAS)
If the refrigerant used in the air conditioner gets into your eyes or on your
hands, it may cause loss of sight or frostbite. Do not touch the refrigerant.
Never loosen any part of the refrigerant circuit.
Do not bring any flame close to any point where the refrigerant gas is
leaking.
1. Start the engine and set the engine speed to approx. 1500 rpm.
2. Press main power switch (1) of the air conditioner to turn the
power ON.
3. Press fan switch (2) and set the air flow to "Hi".
4. Press temperature control switch (3) and set the display
monitor to COOL (A).
5. Open the door and window fully.
6. Press air conditioner switch (4) to turn the air conditioner
switch ON.
7. Use sight glass (6) (inspection window) of receiver drier (5) to
check the condition of the refrigerant gas (freon 134a) flowing
in the refrigerant circuit.
A: Quantity of refrigerant
B: Condition of sight glass
a: Proper: After air conditioner switch is turned ON, few bubbles
are seen and refrigerant becomes milk-white and then becomes
pale milk-white.
b: Insufficient refrigerant: After air conditioner switch is turned ON,
bubbles are seen continuously.
X: Condition of refrigerant flow
Y: Condition of sight glass
x: There are bubbles: Gas and liquid of refrigerant are mixed.
y: There are not bubbles: All refrigerant is liquefied and
transparent.
z: Refrigerant is milk-white: Oil and refrigerant are separated from
each other and their mixture is pale milk-white.
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WARNING
MAINTENANCE