Trane Series R™ Helical Rotary Chiller RTHCB1C1D1

CAUTION: Due to the hygroscopic properties of the POE oil, all oil must be stored in metal containers. The oil will absorb water if stored in a plastic container.

Is the service valve located on the bottom of the oil sump open?

Connect a line to the oil sump drain valve.

Is the valve open and allowing the desired amount of oil to flow into the container?

Measure the exact amount of oil removed from the unit.

Sign off on the compressor oil replacement

CAUTION: To prevent oil sump heater burnout, open the unit main power disconnect switch before removing oil from the compressor.

Trane polyolester oil is the approved oil for the RTHC units. Polyolester oil is extremely hygroscopic meaning it readily attracts moisture. The oil can not be stored in plastic containers due to the hygroscopic properties. As with mineral oil, if water is in the system it will react with the oil to form acids.

Use Table 28 to determine the acceptability of the oil. The proper charge amounts are given in Table 29 .

Note: Use an oil transfer pump to change the oil regardless of chiller pressure.

Did you open the unit main power disconnect switch before removing oil from the compressor?

Did you use Trane polyolester oil for the RTHC units?

Did you store the oil in a non-plastic container?

Did you check the acceptability of the oil using Table 28?

Did you use the proper charge amounts as given in Table 29?

CAUTION: Do not use untreated or improperly treated water, or equipment damage may occur.

Enter the 'approach' temperature

If the approach exceeds 10°F cleaning the condenser tubes is recommended.

Choose the cleaning method used

Retaining bolts from the water boxes removed

Round nylon- or brass- bristled brush used to loosen the sludge

Condenser water tubes thoroughly flushed with clean water

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

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