MAINTENANCE OF SCREW CHILLER MAKE: YORK

November 21, 2016January 16, 2024 Pharma Editor

OBJECTIVE
To lay down a procedure for the Maintenance of the Screw Chiller
SCOPE
This SOP is applicable to Screw Chillers.
RESPONSIBILITY
Technical Supervisor / Engineer
ACCOUNTABILITY
Sr.Executive / Manager
PROCEDURE
Daily Maintenance
Check and ensure oil level as per the mark given on the view glass on oil separator.
Check and ensure the Refrigerant level in the system within limits.(mark given on view glass)

Check and ensure loading and unloading of chiller w.r.t. Set temperature of 41ºF-46ºF

Check and ensure flow of oil in oil separator through view class.

Check for any abnormal sound.

Clean the total system externally with Cora cloth.

Check and ensure all parameters given in logbook are with in limits.

Check and ensure no oil leakage from Mechanical seal.
Put a Tick mark (Ö) in Daily Check Sheet after completion of each activity. If it is not O.K put a cross (X) in Daily Check Sheet indicating the reason in remarks column.

Immediately inform to the concern superior if it is not O.K (X) and take necessary corrective action as per the advice.
Any such deviations should be maintained in the Machine History Cord along with necessary corrective action and its compliance there of.
Weekly Maintenance
Check for any refrigerant leaks in the total system with soap solution.

Check for proper earthing of motor.

Check for all solenoid valves operation.

Check and ensure for all HP & LP cut outs & pressure /flow switches working condition..
Put a Tick mark (Ö) in Weekly Check Sheet.
Monthly Maintenance

Check the function of oil heater by putting hand on side view glass of oil seperator.

Check the oil in the thermo well if the level is reduced to minimum level.

Clean the MPCC with dry cloth and tighten the all terminals.

Check and ensure the stabilizer out put is 24 volts D.C

Clean the control panel with air blower

Put a Tick mark (Ö) in Monthly Check Sheet and repeat the steps as per 5.1.9, 5.1.10 & 5.1.11.
Quarterly Maintenance
Tighten the motor base bolts.
Check the operation condition of all interlocks.

Check and ensure vibration & noise level of the system with in limits.

Put a Tick mark (Ö) in Quarterly Check Sheet.
Half Yearly Maintenance

Regrease the motor bearings.

Conduct a chemical analysis for oil.

Change the duplex filter element, if cooler pressure drop is more than 30% of the oil pressure.

Change the filter dryer in oil return system.

Put a Tick mark (Ö) in Half Yearly Check Sheet.
Yearly Maintenance

Conduct the megger test on motor.

Conduct the pressure test to the system.

Check the programme of microprocessor and operation of all relevant control inputs &outputs.

Conduct the evacuation & dehydration.

Change the oil in the circuit with new oil, if necessary.

Descale the condenser.

Overhaul the motor

Tighten the coupling.

Calibrate the Temperature and pressure gauge.
Put a Tick mark (Ö) in Yearly Check Sheet.

Forms and Records (Annexures)
Not Applicable
Distribution
Master copy – Quality Assurance
Controlled copies- Quality Assurance, Production, Quality Control
History

Date Revision Number Reason for Revision

– 00 New SOP

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