MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC)
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see whether there is corrosion, rust, scaling, leakage phenomenon internal (if necessary, replace the
safety valve). Check the other valves to see whether they open and close smoothly.
▲ High/low pressure switch
Check whether they are in good condition according to “performance of protection device”, every month
and change broken ones in time. Or the chiller may get damaged when over high pressure or too low
pressure happens.
Chilled water cycling
Check for leaks on the unit and the pipe joint with leak detector. Expel the water from the condenser and
evaporator to see whether there are leaks on the water inlet and outlet. Leaks can be found with an
electronic detector, torch detector or soap water. The work looking for refrigerant leaks should be carried
out at least once/month.
Electrical control system
Check insulation resistance monthly. It should be over 1MΩ when measuring with a 500VDC ohmmeter.
Check the running current and compare with the rated value (refer to Table.9). Check the conductibility
of wire and verify whether it is intact and well connected. Tighten loose bolts. Check other components
each month, including the electromagnetic contactor, rotary switch, auxiliary relay, time relay and
thermostat.
Training User Operator
The commissioning process includes training user operators in the following aspects:
1) Stress safety in shutdown and operation processes.
2) Require users to carefully read the operation manual of the unit.
Explain to users that the operation of the unit must be carried out strictly as per the steps and
methods specified in the operation manual. If anyone has any problems about descriptions in the
manual, consult after-sale personnel or professionals in the factory and carry out the operation only
with full understanding. Any deviation in the installation of the unit from the requirements in the
manual must be pointed out to the party responsible for installation. The after-sales factory
personnel will determine whether a change is necessary.
3) Short-connection is forbidden when all protection functions of the unit are normal. Ensure all
protection functions are available and reliable.
Various protection switches in the unit are for the safety of the unit or user, and are not permitted to
be short connected in principle. If short-connection is required for commissioning, after-sales or
factory personnel must do so on site. After commissioning, connect the protection switches to the
system before starting up the unit for long-term running.
4) Open the water pump and wait until the water flow is stable before starting up the master
compressor. For shutdown, the water pump must be closed after a delayed time. Do not forcibly
close the water pump when the master compressor is still running. If the water pump fails, and the
flow switch does not jump, the unit must be immediately shut down.
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