Periodic Maintenance - Trane CITY RTSF Series Manual

Periodic Maintenance

Overview
This section describes preventative maintenance procedures and intervals. Use a periodic maintenance program
to ensure optimal performance and effi ciency of the units. An important aspect of the chiller maintenance program
is the regular completion of the "Operating Log " . When fi lled out properly the completed logs can be reviewed to
identify any developing trends in the chiller's operating conditions.
Weekly Maintenance and Checks
After the unit has operated for approximately 30 minutes and the system has stabilized, check the operating
conditions and complete the procedures below:
• Log the chiller.
• 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 specifi ed in the Operating Conditions.
NOTE: Optimum condenser pressure is dependent on condenser water temperature, and should equal the saturation
pressure of the refrigerant at a temperature 1 to 3°C above that of leaving condenser water at full load.
Monthly Maintenance and Checks
• Review operating log.
• Clean all water strainers in both the chilled and condensing water piping systems.
• Measure the oil fi lter pressure drop. Replace oil fi lter if required. Refer to "Service Procedures " .
• Measure and log the subcooling and superheat.
• If operating conditions indicate a refrigerant shortage, leak check the unit using soap bubbles.
• Repair all leaks.
• Trim refrigerant charge until the unit operates in the conditions listed in the note below.
Table 4 – Operating Conditions at Full Load R1234ze
Description
Evaporator pressure
Condensing pressure
Discharge superheat
Subcooling
All conditions stated above are based on the unit running fully loaded, running at conditions indicated above. If full
load conditions can not be met, refer to note below to trim the refrigerant charge
Note: entering condenser water: 30°C and entering evaporator water: 12°C.
Table 5 – Operating Conditions at Minimum Load R1234ze
Description
Evaporator approach
Condensing approach
Subcooling
EXV percent open
* 0.5°C for new unit.
38
Condition
3.5 bar
9.4 bar
3K
5K
Condition
*< 4°C (non-glycol applications)
*< 4°C
1-2°C
10-20% open
RLC-SVX023B-GB