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Maintenance
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks.
Periodic Maintenance
Perform all of the indicated maintenance procedures at the
intervals scheduled. This will prolong the life of the unit
and reduce the possibility of costly equipment failure. All
maintenance tasks other than recording data must be
performed by a qualified service technician.
Weekly Maintenance
Ensure the unit has been operating for about 10 minutes
and the system has stabilized, check operating conditions
and complete the checkout procedures that follow.
•
Check compressor oil levels. Oil should be visible in the
sight glass when the compressor is running. Operate
the compressors for a minimum of three to four hours
when checking oil level, and check level every 30
minutes. If oil is not at proper level after this period,
have a qualified service technician add or remove oil as
required.
•
Check suction pressure and discharge pressure.
•
Check the liquid line sight glasses.
•
If operating pressures and sight glass conditions seem
to indicate refrigerant shortage, measure system
superheat and system sub-cooling.
•
If operating conditions indicate an overcharge, slowly
(to minimize oil loss) remove refrigerant at the liquid
line service valve. Do not release refrigerant to the
atmosphere.
•
Inspect the entire system for unusual conditions. Use
an operating log to record weekly operating conditions
history for the unit. A complete operating log is a
valuable diagnostic tool for service personnel.
CG-SVX044B-EN
Monthly Maintenance
Ensure the unit has been operating for about 10 minutes
and the system has stabilized, check operating conditions
and complete the checkout procedures that follow.
•
Check compressor oil levels. Oil should be visible in the
sight glass when the compressor is running. Operate
the compressors for a minimum of three to four hours
when checking the oil level, and check level every 30
minutes. If oil is not at proper level after this period,
have a qualified service technician add or remove oil as
required.
•
Check refrigerant superheat at the compressor suction
line. Superheat should be in the range of 10°F–20°F.
Note: A superheat calculated value is incorporated
into the unit controller.
•
Check the liquid line sight glasses.
•
If operating pressures and sight glass conditions seem
to indicate refrigerant shortage, measure system
superheat and system sub-cooling.
•
If operating conditions indicate an overcharge, slowly
(to minimize oil loss) remove refrigerant at the liquid
line service valve. Do not release refrigerant to the
atmosphere.
•
Inspect the entire system for unusual conditions.
Review the weekly operating log for conditions history
for the unit and take note of any unusual trends in
performance. Take appropriate preventative actions if
necessary.
Annually
Perform all weekly and monthly maintenance procedures.
•
Have a qualified service technician check the setting
and function of each control and inspect the condition
of and replace compressor and control contacts if
needed.
•
If chiller is not piped to drain facilities, make sure drain
is clear to carry away system water.
•
Drain water from condenser and evaporator and
associated piping systems. Inspect all piping
components for leakage, damage, etc. Clean out
evaporator and condenser supply strainers.
•
Clean and repaint any corroded surface.
Compressor Maintenance
Compressor Oil
The R-410A scroll compressor uses POE oil as required by
the manufacturer of the compressor. Refer to compressor
manufacturer for exact type and amount of oil in the
specific model in question.
39
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