Maintenance Criteria - Hitachi RCUE40AG2 Service Manual

Maintenance

6.1. Maintenance criteria

Check Item
1. General
Noise
Vibration
2. Cabinet
Dirt
Outside board
Rust
and inner
Vibration
3. Refrigerant Circuit
Refrigerant leakage
General
Capillary pipes
Noise
Oil leakage bleed
Oil level
Insulation Resistance
Oil Heater
Compressor
Ageing of Vibration
Insulation rubber
Intermediate check (1)
Intermediate check (2)
Overhauling
Condenser
Fin clogging
(air-cooled)
Water fl ow, water temp.
Water quality
Condenser
(water-cooled)
Cleaning
Drain water
pag. 150
SMGB0003 rev.0 - 11/2006
Check
Frequency
A/N Confi rm if there is no abnormal noise.
A/N Confi rm visually if there is no abnormal vibration Confi rm visually if there is no abnormal vibration
A/N Clean with cloths
A/N Perform repair painting with Anticorrosion paint
A/N Re-tighten screws Re-tighten screws
Confi rm if there is no refrigerant leakage by
using detecting device in each component
and pipe connection parts. As for checking
once/ season for leakage in water cooler and condenser,
confi rm it with the air discharged to water inlet
and outlet, and in this, case water should be
drained.
once/
Perform visual check if there is no contact or
resonance.
season
Confi rm if there is no abnormal noise at starting,
A/N
operating and stop.
Confi rm if there is no oil leakage or bleed from
A/N
the compressor.
A/N Perform visual check by sight glass.
once/
More than 3MΩ at 500V DC
season
once/
Apply current during compressor stop.
season
once/
Touch and confi rm if they have rubber elasticity.
season
Pay special attention to noise, vibration and oil
once/ 3,000 hr
leakage etc.
Confi rm if safety device and protection device
once/ 6,000 hr
function well.
once/ 24,000 hr
(water-cooled)
Overhaul the compressor and check it according
40,000 hr to the specialist' advice.
(Air-cooled)
once / season Clean it spraying warm water (less than 40ºC).
A/N Confi rm if they are within the criteria
once/
Confi rm if it is within the criteria.
month
Confi rm if high pressure is within the criteria.
A/N
Perform the predetermined cleaning.
If condenser is not used for intermediate or long
once/ season period, drain water. At this time, open also plug
for draining water and for removing air. for draining water and for removing air.
Criteria (procedure) Remarks
Judge from aprox. 1m
from the control panel
surface.
See following

"maintenance criteria

of Screw compressor"
for details
See technical
catalogue for details.
See technical
catalogue for details.
Frequency of cleaning
differs depending on
result of water quality
or operation time.