Trane Series R™ Helical Rotary Chiller RTHCD3G3G3

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.

Is the oil level between 2” and 5”?

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.

Is the gas pump functioning properly?

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

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 line connected to the oil sump drain valve?

Open the valve and allow the desired amount of oil to flow into the container and close the charging valve.

Is the valve open and oil flowing into the container?

Measure the exact amount of oil removed from the unit.

Sign off on the compressor oil replacement

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

Condenser tube fouling is indicated when the “approach” temperature is higher than predicted.

Standard water applications will operate with less than a 10°F approach. If the approach exceeds 10°F cleaning the condenser tubes is recommended.

NOTE: Glycol in the water system typically doubles the standard approach.

If the annual condenser tube inspection indicates that the tubes are fouled, 2 cleaning methods can be used to rid the tubes of contaminants.

Mechanical tube cleaning- this method is used to remove sludge and loose material from smoothbore condenser tubes.

Remove the retaining bolts from the water boxes at each end of the condenser.

Use a hoist to lift the water boxes.

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 and condenser pressures 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