York Screw Chiller YCIV0247VA46

Warning: This procedure requires trained personnel with PPE!

Are all system valves 100% open?

Are all valves to the atmosphere closed with flare caps in place?

Enter the unit's initial evacuation level

Enter the system's dry nitrogen charge

Did the soap and water solution form bubbles?

Upload a photo of the unit fitting joint and weld seams

Did you use an ultrasonic leak detector?

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

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 evaporator approach (STD), discharge superheat and subcooling at the design values for the condition?

Enter the design values from the FOF

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

Enter the Evaporator approach = (LCHLT) - (EST)

Enter the Discharge superheat = (DT) - (CST)

Enter the Subcooling = (CST) - condensed refrigerant liquid temperature (from condenser outlet)

Warning: Only trained personnel should perform this procedure.

Is the vapor portion of the refrigerant container or cylinder free from contamination?

Enter the saturation property for the correct refrigerant

Enter the saturation pressure and ambient temperature of the refrigerant in the container

Is the system pressure raised above the corresponding saturation pressure at the freezing point of the chilled liquids?

Enter the freeze point temperature and vapor charge to a pressure that is 5°F (2.78°C) higher than that freeze point

Enter the starting weight for the refrigerant cylinder

Is a refrigerant pump required to draw vapor from the chiller and discharge it to the vapor connection of the refrigerant cylinder?

Is air prevented from entering the system?

Connect a high-capacity vacuum pump with indicator to the charging valves as shown in Figure 147 on page 306 and Figure 148 on page 306

Ensure all the system valves including manual valves and EEVs are 100% open

Ensure that all valves to the atmosphere are closed with flare caps in place, if applicable

Operate the vacuum pump until a pressure of 5,000 μm is reached

To start the 8-hour vacuum hold test, close the system charging valve connection to the vacuum pump

Hold the vacuum obtained in Step 4 in the system for 8 hours

Check for pressure change with the chiller at the same temperature