Periodic Maintenance; Weekly Maintenance; Monthly Maintenance - Trane RTAA-70 Installation & Maintenance Manual

RTAA-SVX01A-EN

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.
If the unit does not operate properly during maintenance inspections, refer to
"Diagnostics and Troubleshooting" .

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, non condensable or excessive pressure drop in the liq-
uid line. A restriction in the line can sometimes be identified by a notice-
able 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 "System Superheat" and "System Subcooling" .
• 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 and inspect the con-
denser coils for dirt and debris. If the coils are dirty, refer to RTAA-SB-20
and RTAC-SVG01A-EN.

Monthly Maintenance

• Perform all weekly maintenance procedures.
• Measure and record the system superheat. Refer to "System Superheat" .
• Measure and record the system subcooling. Refer to "System
Subcooling" .
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