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Maintenance
Periodic General 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 task.
Systematic, periodic general maintenance of the CeilAir
unit is required for optimum system performance. General
maintenance should include, but not be limited to, the
following: Replacing filters and humidifier cylinders;
tightening loose fasteners and electrical connections;
checking the condensate line to ensure it is free of debris;
cleaning the interior of the unit; visually inspecting the
units' components; checking belt tension; checking the
level of refrigerant; and ensuring no moisture is in the
refrigerant.
Use copies of the "TR-OHS Preventive Maintenance
Inspection Checklist" in Appendix A to record periodic
general maintenance inspections. For assistance, contact
Trane Product Support. Follow all safety instructions while
performing any type of maintenance.
Trane recommends a general schedule of quarterly
preventive maintenance inspections. Some items, such as
filters or coil fins, may need more frequent inspection and
maintenance, depending on environmental conditions.
If refrigerant gas is released in an enclosed area it will
displace oxygen and act as a suffocant. Always ensure
adequate ventilation during refrigeration repairs.
Always recover all refrigerant prior to any system repairs.
Failure to do so may result in system over pressurization
and rupture. Follow the guidelines in
Refrigerant," p.
37.
Turn off power to the unit at the service disconnect switch
unless you are performing tests that require power. With
power and controls energized, the unit could begin
operating automatically at any time.
Hazardous voltage will still be present at the evaporator,
condenser, heater/reheater and humidifier, even with the
AH-SVX008C-EN
unit turned off at the controller. To isolate the unit for
maintenance, turn off power at a non-fused service switch.
Always disconnect main power prior to performing any
service or repairs. To prevent personal injury, stay clear of
rotating components because automatic controls may
start them unexpectedly.
A/C Unit
•
•
•
Compressor
Verify compressor operation:
•
•
•
"Recovering
•
Heater
Inspect heater items:
•
•
Check the refrigerant sight glass on a monthly basis
while the unit is running. Excessive bubbles in the
sight glass indicates a low refrigerant charge or a
clogged filter-drier.
Check for moisture in the refrigerant by viewing the
color of the indicator in the center of the sight glass and
comparing it to the color scale on the outer ring. If
moisture is present, the system must be evacuated and
recharged.
Check the superheat and sub-cooling temperatures
semi-annually and ensure they are within the range
shown in the refrigerant pressure/ temperature table in
"Pressure/Temperature Settings," p.
adjust the refrigerant charge to achieve the correct
values. If the refrigerant level is low, check the system
for leaks.
• Inspect electrical items:
• Fuses
• Internal wiring for discoloration
• Check electrical connections are secure
• Check low voltage connections
• Relays and contactors for serviceability, i.e., pitted
contacts, weak coils
Verify the following:
• Controller operation
• Customer setpoints
• Air safety switch and tubing
• Chilled water valve operation
Visually inspect for oil leaks
Check for excessive vibration
Check crankcase heater operation
If unit has an oil-level sight glass, verify compressor oil
level during operation (all compressors)
Heater elements for any damage
Heater overloads for damage
30. If necessary,
39
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