13
▲
DANGER
！
▲
DANGER
！
MAINTENANCE
Refrigerant R-22 (kg)
Model
Compressor
Model
Operating
Charge
RUA-13AT3S
500DH
3.1
750EL
4.3
RUA-15AT3S
750EL
4.2 (L) /
4.6 (R)
RUA-20AT3S
1000EL
2 x 6.0
RUA-30AT3S
1000EL
3 x 6.5
Note: (L) = Left Cycle, (R) = Right Cycle
Fig. 11. Refrigerant Re-Charge
Compressor Removal
When removing the compressor,
1. Shut OFF the power supply to the unit.
2. Remove all wiring connections and piping
connections to the compressor.
3. Remove the bolts on the compressor seat
fastened on the base.
4. Pull out the compressor seat and remove
compressor fastened bolts.
Turn OFF all the switches before
servicing.
Do not charge OXYGEN,
ACETYLENE or other flammable
and poisonous gases into the
refrigeration cycle when
performing a leakage test or an
airtight test. These types of
gases are extremely dangerous,
because explosion can occur. It
is recommended that
compressed air, nitrogen or
refrigerant be charged for these
types of tests.
8. WINTER SHUTDOWN
Winter shutdown
When shutting down the unit for winter, clean the
inside and the outside of the cabinet and dry the
unit, especially the drain pan and the drain lines.
This unit shall be preferably covered during
shutdown, in order to protect it from dust and
environmental conditions.
Spring Start-Up
After any extended shutdown period, prepare the
unit for operation as follows.
1. Thoroughly inspect and clean the unit.
2. Clean or replace the air filters.
3. Clean the condensate drain lines.
4. Remove any accumulated dirt from the
condenser and the evaporator coil.
5. Check the fan balance and attempt to operate
the fan.
6. Check the fan belt tension.
7. Tighten all wiring connections and access
panels.
9. REPLACEMENT OF PARTS
Replacement of parts should be performed by
ordering from the HITACHI Parts List. The Form A
HITACHI Recommended Spare Parts List is
advisable. When replacement of parts becomes
necessary, prepare the parts shown in the Form A
Parts List.
Pressure
Control
Valve
