Vii.maintenance; Daily Maintenance - Midea LSBLG MCF Series Technical & Service Manual

Flooded type water cooled screw chiller (MIC)

VII.Maintenance

ATTENTION:
All installation parts must be maintained by personnel in charge, to avoid material deterioration and
injuries to people. Faults and leaks must be repaired immediately. Authorized technician must repair
faults immediately. Each time repairs have been carried out on the unit, the safety devices must be
re-checked.
Do not use oxygen to purge lines or to pressurize a machine for any reason. 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 refrigerant type must be within easy reach.
Do not siphon the refrigerant. Avoid spilling liquid refrigerant on your skin or splashing it into your eyes.
Use safety goggles. Wash any spills from the skin with soap and water. If liquid refrigerant enters your
eyes, immediately and abundantly flush the eyes with water and consult a doctor.
Never let an open flame or live steam come 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 the 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 use 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 destroy 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 correspond 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
powered off and the oil is cool, energize the oil heaters and allow 8 hours for heater to remove
refrigerant from the oil before starting.
2. Check and tighten all electrical connections.
88
MCAC-CTSM-2018-1