Hitachi RUA-NP20ATS, Инструкция по эксплуатации

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The unit is equipped with an adjustable motor
pulley. The fan speed can be varied through a
given range by adjustment of the pulley. Table 1.
shows the setting speed and the variable speed
range. To change the speed, adjust the motor
pulley as follows (refer to Fig. 7).
1. Loosen the two bolts on the adjusting bracket
for the fan belt tension and loosen the belt by
pushing the motor upward.
2. Loosen the set screw in the movable pulley
flange.
4. Tighten the set screw in the movable pulley,
which is positioned over the flat surfaces of the
fixed pulley.
5. Adjust the belt tension (approximately 20 mm
deflection with one finger) by pushing the motor
downward and tightening the bolts on the
adjusting bracket.
3. Turn the movable pulley flange toward the fixed
flange to increase the speed, and turn it away
from the fixed flange to decrease the speed.
Each turn of the movable flange will increase or
decrease the fan speed by 32 rpm
.
Fig. 7. Adjustable Motor Pulley
Table 1. Fan Speed Adjustment
RPM: Fan Speed (RPM)
PD* : Pitch Diameter of Motor Pulley (mm)
RPM/Turn**: Fan Speed Change per One Turn of Movable Motor Pulley Flange (RPM per Turn)
5. REMOVING SHIPPING WASHERS
Fig.8-1.
Removing Shipping Washers
Compressor is mounted on rubber isolators, and is held rigid during shipment by two sets of shipping
washers (refer to Fig. 8-1). Before
starting the compressor, remove the yellow-painted shipping washers, the
compressor should float freely on the rubber isolators.
6
REMOVING SHIPPING WASHERS
4. FAN SPEED ADJUSTMENT
FAN SPEED ADJUSTMENT