RT-SVX23D-EN 49
Maintenance
Record this data on an “operator’s maintenance log” like the one shown in Tabl e 9 . If the operating
pressures indicate a refrigerant shortage, measure the system superheat. For guidelines, refer to
the “Compressor Start-Up” section.
Note: Do Not release refrigerant to the atmosphere! If adding or removing refrigerant is required,
the service technician must comply with all federal, state and local laws.
Heating Season
• Inspect the unit’s air filters. If necessary, clean or replace them.
• Check supply fan motor bearings; repair or replace the motor as necessary.
• Inspect both the main unit control panel and heat section control box for loose electrical
components and terminal connections, as well as damaged wire insulation. Make any
necessary repairs.
• Verify that the electric heat system operates properly.
Coil Cleaning
Regular coil maintenance, including annual cleaning, enhances the unit’s operating efficiency by
minimizing: compressor head pressure and amperage draw; evaporator water carryover; fan brake
horsepower, due to increase static pressure losses; airflow reduction.
At least once each year, or more often if the unit is located in a “dirty” environment, clean the
evaporator and condenser coils using the instructions outlined below. Be sure to follow these
instructions as closely as possible to avoid damaging the coils.
Note: For units equipped with hail guards follow removal procedure listed below.
Hail Guard Removal
• Unlatch hail guards.
• Pull the top of the hail guard outward until the fastener studs are free of the retaining nuts.
• Lift the hail guard from the lower retaining bracket and set aside.
To clean refrigerant coils, use a soft brush and a sprayer (either a garden pump-up type or a high-
pressure sprayer). A high-quality detergent is also required; suggested brands include “SPREX
A.C.”, “OAKITE 161”, “OAKITE 166” and “COILOX”. If the detergent selected is strongly alkaline (ph
value exceeds 8.5), add an inhibitor.
Figure 30. Slide-style and ball-style latches
HAIL GUARD
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