Check Refrigerant; Check Compressor And Pulley; Check Switch Operation - Hitachi ZW180 Operator's Manual

6
Check Refrigerant --- every 6 months
After running the engine at 1500 min
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
ZW180
ZW220
HFC
ZW250
ZW300
CAUTION: Do not dispose FREON into the atmo-
sphere to prevent depletion of ozone layer and global
warming.
7
Check Compressor and Pulley --- once a year
Check the compressor and its vicinity for abnormality in opera-
tion, oil stain, or refrigerant leakage. Check the pulley for an
abnormal noise emitting.
Check compressor:
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.
8
Check Switch Operation --- once a year
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.)
MAINTENANCE
-1
(rpm) for a few minutes,
Refrigerant No. Quantity kg
0.95 ± 0.05
R134a 1.05 ± 0.05
1.00 ± 0.05
7-94
1
M4GB-07-112
ZW310
M4GB-07-114
M178-01-017