Trane Series R™ Helical Rotary Chiller RTHCC2G1G1

Warning: This procedure requires trained personnel with PPE!

Chiller shut down on a “Low Oil Flow” diagnostic?

Compressor shut down on a “Loss of Oil at Compressor (Running) diagnostic?

Pressure drop between the two service valves in the lubrication circuit

If pressure drop exceeds the maximum level, proceed with the following steps

Isolate the oil filter by closing the two ball valves located before and after the filter.

Relieve the pressure from the hydraulic line through the 1/4” schrader valve located between the ball valve and the oil filter (or the ball valve and oil cooler, if so equipped).

Use a rubber mallet to break loose the nut that secures the oil filter element to the filter manifold.

Turn the nut clockwise until the filter element detaches from the manifold.

WARNING: Hazardous Voltage! Disconnect all electrical power, including remote disconnects before servicing. Failure to disconnect power before servicing can cause severe personal injury or death.

Perform all weekly and monthly maintenance procedures.

Check the refrigerant charge and oil level.

Routine oil changing is not necessary on a hermetic system.

Have a qualified laboratory perform an oil analysis to determine system moisture content and acid level.

IMPORTANT: 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.

Check the pressure drop across the oil filter.

Contact a qualified service organization to leak check the chiller, to inspect safety controls, and inspect electrical components for deficiencies.

Inspect all piping components for leakage and damage. Clean out any inline strainers.

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

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?

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.

Is the oil pump connected to the schrader valve?

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

Is the oil charging pump operated and connection tightened?

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>).