7-94
M4GB-07-112
M4GB-07-114
M178-01-017
ZW310
After running the engine at 1500 min
-1
(rpm) for a few minutes,
check the refrigerant quantity through sight glass (inspection
port) (1). This machine uses new Freon R134a as the refriger-
ant. Before charging the refrigerant, first collect the entire re-
frigerant from the cooling system. Then, charge the refrigerant
by the specified quantity. In case any abnormality is found in
the air conditioner, consult your nearest Hitachi dealer.
Type Refrigerant No. Quantity kg
ZW180
HFC R134a
0.95 ± 0.05
ZW220
ZW250
1.05 ± 0.05
ZW300 1.00 ± 0.05
Check the compressor and its vicinity for abnormality in opera
-
tion, oil stain, or refrigerant leakage. Check the pulley for an
abnormal noise emitting.
After operating the air conditioner for 5 to 10 minutes,
touch both the high pressure pipe and the low pressure
pipe. Normally, the high pressure pipe must be hot and the
low pressure pipe must be cool.
Check all air conditioner switch functions by operating the
respective switch. To check the air conditioner function, oper
-
ate plural numbers of the switches at the same time. (Refer to
page 1-38.)
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