RLC-SVX14H-GB
84
Overview
This section describes preventative maintenance
procedures and intervals for the RTWD unit. Use a
periodic maintenance program to ensure optimal
performance and effi ciency 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 fi lled 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).
CAUTION
Refrigerant!
If both suction and discharge pressures are low but
sub-cooling is normal, a problem other than refrigerant
shortage exists. Do not add refrigerant, as this may result
in overcharging the circuit.
Use only refrigerants speci
fi
ed on the unit nameplate
(R134a or R1234ze) and Trane OIL 048E on SE, HE, PE
versions with R134a, OIL00317 on HSE version with
134a and OIL066E or OIL067E for R1234ze. Failure to
do so may cause compressor damage and improper unit
operation.
CAUTION
Equipment Damage!
Ensure that the oil separator and compressor heaters
have been operating for a minimum of 24 hours before
starting. Failure to do so may result in equipment
damage.
Maintenance
WARNING Hazardous Voltage!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run capacitors
before servicing. Follow proper lockout/tagout procedures
to ensure the power cannot be inadvertently energized.
Verify with an appropriate voltmeter that all capacitors
have discharged. Failure to disconnect power and
discharge capacitors before servicing could result in
death or serious injury.
RTWD HSE version
•
Time before to work on the electrical panel of the unit:
once the AFD is off (confi rmed by the extinction of the
display), it is mandatory to wait one minute before
working on the electrical panel.
•
However, for any intervention in the AFD, the indicated
time on the label of the AFD must be respected.
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.
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 CH530.
Pressure readings should fall within the specifi ed
ranges listed under 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 and confi rm using soap bubbles.
•
Repair all leaks.
•
Trim refrigerant charge until the unit operates in the
conditions listed in the note below.
Note: Eurovent conditions are condenser water: 30/35°C
and evaporator water: 12/7°C.
Table 25 - Operating Conditions at Full Load for R134A
Description
Condition
Evaporator pressure
2.1 - 3.1 bar
Condensing pressure
5.2 - 8.6 bar
Discharge superheat
5.6 - 8.3 K
Subcooling
2.8 - 5.6 K
Service and Maintenance
