Trane Series R™ Helical Rotary Chiller RTHCD2G3G3

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

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 use an oil transfer pump to change the oil?

Sign off on the compressor oil maintenance

Warning: This procedure requires trained personnel with PPE!

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]”.

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

Measure and log the subcooling and superheat

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