Installation and Maintenance Manual

RLC-SVX09H-EN 181
Service and Maintenance
Overview
This section describes preventative maintenance
procedures and intervals for the RTWD unit. Use a periodic
maintenance program to ensure optimal performance and
efficiency of the Series R units.
An important aspect of the chiller maintenance program is
the regular completion 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 correct, the possible
cause(s) of this condition (e.g., fouled condenser tubes,
non-condensables in the system).
Maintenance
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
g
auges and compare to the reading on the CH530.
Pressure readings should fall within the specified
ranges listed under Operating Conditions.
Note: For RTWD units, 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 unit and confirm using soap bubbles.
• Repair all leaks.
• Trim refrigerant charge until the unit operates in the
conditions
listed in the note below.
Note: AHRI conditions are: condenser water: 85
o
F and 3
GPM per ton and evaporator water: 54-44
o
F.
• Clean condenser coils.
• If full load conditions can not be met. Refer to note
below
to trim the refrigerant charge
Note: Conditions at minimum must be: entering
condenser water: 85F and entering evaporator
water: 55F
Note: RTUD operating conditions are the physical
configuration of the installation.
Annual Maintenance
Shut down the chiller once each year to check the
following:
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
Table 124. RTWD Operating Conditions at Full Load
Description Condition
Evaporator pressure 30-45 psig
Condensing pressure 75-125 psig
Discharge superheat 10-15 F
Subcooling 5-10 F
Note: All conditions stated above are based on the unit running fully loaded,
running at AHRI conditions.
Table 125. RTWD Operating Conditions at Minimum Load
Description Condition
Evaporator approach *less than 7°F (non-glycol applications)
Condensing approach *less than 7°F
Subcooling 2-3°F
EXV percent open 10-20% open
*
1.0
o
F for new unit.