York Screw Chiller YCIV0177VA46

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

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

Enter the evaporator approach (STD)

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

If not included, they can be provided upon request from the chiller sales engineer from the chiller rating program

Equations: Evaporator approach = (LCHLT) - (EST), Discharge superheat = (DT) - (CST), Subcooling = (CST) - condensed refrigerant liquid temperature (from condenser outlet)

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

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

Check programmable operating setpoints and safety cutouts and ensure they are correct for the application

Check compressor and evaporator heater operation

Check for dirt in the control panel

Check door gasket sealing integrity