Maintenance; Periodic Maintenance; Compressor Maintenance - Trane Cold Generator CG-SVX044F-EN Installation, Operation And Maintenance Manual

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-SVX044F-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.
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