Trane R Series, Installation Operation & Maintenance

Page: 133 / 188

RLC-SVX07A-EN 133
Periodic Maintenance
Perform all maintenance procedures and inspections at the recommended
intervals. This will prolong the life of the equipment and minimize the possi-
bility of costly failures.
Use an “Operator's Log”to record an operating history for the unit. The log
serves as a valuable diagnostic tool for service personnel. By observing
trends in operating conditions, an operator can anticipate and prevent
problem situations before they occur.
Weekly Maintenance
After the unit has been operating for approximately 30 minutes and the
system has stabilized, check the operating conditions and complete the
procedures below:
• Check the evaporator refrigerant pressure and the condenser refrigerant
pressure in the Refrigerant Report Menu on the Clear Language Display.
The pressures are referenced to sea level (14.6960 psia).
• Check the liquid line sight glasses. The refrigerant flow past the sight
glasses should be clear. Bubbles in the refrigerant indicate either low
refrigerant charge or excessive pressure drop in the liquid line. A restric-
tion in the line can sometimes be identified by a noticeable temperature
differential between the two sides of the restriction. Frost may often form
on the line at this point. Proper refrigerant charges are shown on
Table 1 .
CAUTION
Equipment Check!
A clear sight glass alone does not mean that the system properly
charged. Also check system superheat, subcooling, and unit
operating pressures.
• If operating pressures and sight glass conditions seem to indicate refrig-
erant shortage, measure the system superheat and system subcooling.
Refer to Paragraphs
"System Superheat" on Page 128 and "System Sub-
cooling" on Page 128 .
• If operating conditions indicate a refrigerant overcharge, remove refriger-
ant at the liquid line service valve. Use appropriate refrigerant recovery
practices that allow refrigerant to escape slowly, to minimize oil loss. Do
not discharge refrigerant into the atmosphere.
• Inspect the entire system for unusual conditions.
Monthly Maintenance
• Perform all weekly maintenance procedures.
• Measure and record the system superheat. Refer to Paragraph "System
Superheat" on Page 128 .
• Measure and record the system subcooling. Refer to Paragraph "System
Subcooling" on Page 128 .
Annual Maintenance
• Perform all weekly and monthly maintenance procedures.