RTHD-SVX01D-EN 127
Periodic Maintenance
Overview
This section describes preventative maintenance procedures and intervals for
the Series R unit. Use a periodic maintenance program to ensure optimal per-
formance and efficiency of the Series R units.
An important aspect of the chiller maintenance program is the regular com-
pletion of the “Series R Operating Log”; an example of this log is provided in
this manual. When filled out properly the completed logs can be reviewed to
identify any developing trends in the chiller's operating conditions.
For example, if the machine operator notices a gradual increase in condensing
pressure during a month's time, he can systematically check for and then cor-
rect, the possible cause(s) of this condition (e.g., fouled condenser tubes,
non-condensables in the system).
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 specified 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 2 to 5°F 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 filter pressure drop. Replace oil filter if required. Refer to
“Service Procedures”.
• Measure and log the subcooling and superheat.
• If operating conditions indicate a refrigerant shortage, leak check the uni-
tan confirm using soap bubbles.
• Repair all leaks.
• Trim refrigerant charge until the unit operates in the conditions listed in
the note below.
NOTE: ARI conditions are: condenser water: 85
o
F and 3 GPM per ton and
evaporator water: 54-44
o
F.
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