Trane Series R™ Helical Rotary Chiller RTHCC1B3C2

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.

The oil in the compressor oil sump is under a constant positive pressure at ambient temperature. To remove oil, open the service valve located on the bottom of the oil sump and drain the oil into a suitable container using the procedure outlined below:

Connect a line to the oil sump drain valve.

Did you open the valve and allow the desired amount of oil to flow into the container and close the charging valve?

Measure the exact amount of oil removed from the unit.

Sign off on the compressor oil replacement

Warning: This procedure should be performed by trained personnel only.

Is the gas pump returning the oil to the compressor?

Enter the liquid level reading from the sensor

Enter the suction pressure reading

Enter the evaporator approach reading

Upload a photo of the pressure drop across the filter as shown in Figure 34

Is the pressure drop within the normal range at full load conditions?

If the oil is logged in the evaporator, manually move the oil from the evaporator to the oil sump.

Sign off on the gas pump oil filter replacement

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 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.

If the oil is logged in the evaporator confirm the operation of the gas pump. If the gas pump is not functioning properly all oil will be logged in the evaporator.

After the level is determined, close the service valves and remove the hose/sightglass assembly.

Sign off on the oil sump level check.

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

Locate the 1/4” schrader valve between the ball valve and oil filter (or the ball valve and oil cooler, if so equipped).

Loosely connect oil pump to schrader valve called out in step 1.

Operate oil charging pump until oil appears at the charging valve connection; then tighten the connection.

Note: To keep air from entering the oil, the charging valve connection must be air- tight.

Close the ball valve just upstream of the schrader valve connected to the oil pump.

At the UCP2 display panel, press <Service Tests> and enter the password (++--++) followed by <Enter>).

Press <enter> to access the service tools group.

Press <next> 12 times to display “Master Oil Line Solenoid Valve: [Mode]”.

Press ‘+’ to change the mode from “Auto” to “On”.