Trane Series R™ Helical Rotary Chiller RTHCD1G2G2

After the unit has operated for approximately 30 minutes and the system has stabilized, check the operating conditions and complete the procedures below:

Check evaporator pressure with gauges and compare to the reading on the Clear Language Display.

Check condenser pressure with gauges and compare to the reading on the Clear Language Display.

Pressure readings should fall within the following ranges specified in the Operating Conditions table:

NOTE: Optimum condenser pressure is dependent on condenser water temperature, and should equal the saturation pressure of the refrigerant at a temperature 2 to 5°F above that of leaving condenser water at full load.

Sign off on the weekly maintenance of the Series R™ Helical Rotary Chiller.

Warning: Disconnect ALL power before/during evacuation.

Is the cause of lost refrigerant determined and problem repaired?

Is the vacuum pump connected to the 5/8” flare connection on the bottom of the evaporator and/or condenser?

Enter the system pressure in microns after evacuation

Did the system pressure rise more than 150 microns during the standing rise test?

If the pressure rose more than 150 microns, describe the potential leak or moisture issue

NOTE: If oil is in the system, this test is more difficult. The oil is aromatic and will give off vapors that will rise the pressure of the system.

Sign off on the refrigerant charge procedure

Clean all water strainers in both the chilled and condensing water piping systems

Measure the oil filter pressure drop

Replace oil filter if required. Refer to “Service Procedures”

Measure and log the subcooling and superheat. Refer to Table 26

If operating conditions indicate a refrigerant shortage, leak check the unit using soap bubbles

Trim refrigerant charge until the unit operates in the conditions listed in Table 26 at full load, ARI conditions

NOTE: ARI conditions are: condenser water: 85°F and 3 GPM/XXX tons and evaporator water: 54-44°F

Warning: This procedure requires trained personnel with PPE!

Run the unit fully loaded for approximately 20 minutes

Attach the 3/8” or 1/2” hose with a sightglass in the middle to the oil sump drain valve and the condenser service valve at the top of the condenser

After the unit is off line for 10 minutes move the sightglass along the edge of the condenser tubesheet at the same height of the oil sump

Enter the oil level from the bottom of the oil sump

If the level appears to be above 8”, the oil sump is completely full. Most likely more oil resides in the rest of the system and some oil needs to be removed until the level falls between 2” and 5” in the oil sump.

If the level is below 2”, there is not enough oil in the sump. This can occur from not enough oil in the system or more likely, oil migration to the evaporator. Oil migration can occur from a low refrigerant charge, gas pump malfunction, etc.

Confirm the operation of the gas pump

Use a nondestructive tube test to inspect the condenser and evaporator tubes at 3-year intervals.

NOTE: It may be desirable to perform tube tests on these components at more frequent intervals, depending upon chiller application. This is especially true of critical process equipment.

Depending on chiller duty, contact a qualified service organization to determine when to conduct a complete examination of the unit to determine the condition of the compressor and internal components.

Nondestructive tube test passed?

Describe any issues found during the tube test

Was a complete examination of the unit conducted?

Describe the condition of the compressor and internal components

Sign off on the 3 Yearly Series R™ Helical Rotary Chiller Maintenance