Flooded type water cooled screw chiller (PCB Control)
93
VII.
Maintenance
ATTENTION:
All installation parts must be maintained by the personnel in charge, in order to avoid material
deterioration and injuries to people. Faults and leaks must be repaired immediately. The authorized
technician must have the responsibility to repair the fault immediately. Each time repairs have been
carried out to the unit, the operation of the safety devices must be re-checked.
Do not use oxygen to purge lines or to pressurize a machine for any purpose. Oxygen gas reacts
violently with oil, grease, and other common substances.
The necessary protection equipment must be available, and appropriate fire extinguishers for the system
and the refrigerant type used must be within easy reach.
Do not siphon refrigerant. Avoid spilling liquid refrigerant on skin or splashing it into the eyes. Use safety
goggles. Wash any spills from the skin with soap and water. If liquid refrigerant enters the eyes,
immediately and abundantly flush the eyes with water and consult a doctor.
Never let an open flame or live steam close to a refrigerant container. Dangerous overpressure can
result. If it is necessary to heat refrigerant, only use warm water.
Do not re-use disposable (non-returnable) cylinders or attempt to refill them. It is dangerous and illegal.
When cylinders are empty, evacuate the remaining gas pressure, and move the cylinders to a place
designated for their recovery. Do not incinerate.
Ensure that you are using the correct refrigerant type before recharging the unit. Charging any
refrigerant other than the original charge type (R-22) will impair machine operation and can even lead to
a destruction of the compressors. The compressors operating with this refrigerant type are lubricated
with a synthetic
Do not climb on a machine. Use a platform, or staging to work at higher levels. Use mechanical lifting
equipment (crane, hoist, winch, etc.) to lift or move heavy components. For lighter components, use
lifting equipment when there is a risk of slipping or losing your balance. Use only original replacement
parts for any repair or component replacement. Consult the list of replacement parts that corresponds to
the specification of the original equipment.
1.
Daily maintenance
Annual Startup
This is a good time to check all the motor winding resistance to ground. Semi-annual checking and
recording of this resistance will provide a record of any deterioration of the winding insulation. All new
units have
well over 100 MΩ resistances between any motor terminal and ground.
1. The control circuit must be energized at all times, except during service. If the control circuit has been
off and oil is cool, energize oil heaters and allow 8 hours for heater to remove refrigerant from the oil
before starting.
2. Check and tighten all electrical connections.
