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 cannot 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.
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
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General