York Screw Chiller YCIV0397VA46

The following maintenance checks should be carried out on a daily basis by the operator/customer

The units are not generally user serviceable

No attempt should be made to rectify faults or problems found during daily checks unless competent and equipped to do so

If in any doubt, contact your local Johnson Controls Service Agent

Unit status: Press the STATUS key on the keypad and ensure no fault messages are displayed

Operating conditions: Read the operating pressures and temperatures at the control panel using the display keys

Check that these are within the operating limitations given in the manual

Compressor oil level: Check the compressor oil level after the compressor has been operating on FULL LOAD for approximately half an hour

Warning: This procedure requires trained personnel with PPE!

All system valves including manual valves and EEVs are 100% open

All valves to the atmosphere are closed with flare caps in place

Enter the unit's initial evacuation level

Enter the system pressure after charging with dry nitrogen

Soap and water solution prepared

Soap solution test performed on each unit fitting joint and weld seams

Check oil level in the oil separator sight glass

Check liquid line sight glass / moisture indicator

Record system operating temperatures

Record system operating pressures

Check condenser coils for dirt/debris

Clean condenser coils if necessary

Sign off on the weekly chiller check

This procedure must be performed by an industry certified technician

Maintain a record of this procedure for warranty purposes

Superheat on the economizer feed to the compressor

Warning: This procedure requires trained personnel with PPE!

Enter the amount of chiller refrigerant charge

Reference the unit Sales Order screen on the chiller control panel to determine the required charge

Is the refrigerant charge level correct during operation?

Enter the evaporator approach (STD), discharge superheat and subcooling values

For new sales, these design values are included as part of the FOF

Enter the values for Evaporator approach, Discharge superheat, and Subcooling

Definitions: EST = Evaporator Saturation Temperature, LCHLT = Leaving evaporator liquid temperature, DT = Compressor Discharge Temperature, CST = Condenser Saturation Temperature