A
HE, DE & RE MANUAL
IOM-26
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Oct 12 R4
CONTROLS
Annually clean and recalibrate all controls, check for proper operation, and repair or replace any faulty
controls. Check all damper hardware settings every three months. Replace blown fuses with equivalent
size and type fuse. Failure to do so can result in damage to the unit.
CONTROL ENCLOSURE VENTILATION
Control enclosures are often ventilated in summer to provide component cooling. A manually adjustable
slide damper is provided for adjustment and seasonal shut off. The slide damper should be closed for
winter operation and opened for summer operation.
OUTDOOR AIR INTAKES, MIXING SECTIONS AND DAMPERS
Outdoor air intakes, screens, and adjacent areas shall be checked semi-annually for cleanliness, integrity
and proper operation. Adjust dampers where required.
COILS
Inspect coils and drain pans for cleanliness and biological growth once per year during the cooling season
or more often as required.
Warning:
Dirty coils can be a cause of poor air quality. Failure to maintain clean coils
can cause injury or death, damage to the equipment, property damage or
system operational problems. Moisture carry over can result from dirty coils.
The external surface of finned coils can be cleaned using a low pressure water spray and a brush. Coil
fins are easily damaged. Do not use high pressure steam or water to clean coils; it will permanently
damage the coil. When using cleaning additives or solutions they must be compatible with the coil
materials or coatings. Use a fin comb to straighten any damaged or bent fins.
Coil Winterization:
Water coils that are not in use must be protected from freezing. Coils should be drained and blown out
with compressed air and then filled and drained several times with appropriate strength pre-mixed inhibited
HVAC glycol or other suitable fluid. Do not use propylene glycol with CPVC piping.
ULTRAVIOLET SCANNERS
The viewing area of the scanner must be kept clean. Even a small amount of contamination will reduce the
flame signal reaching the detector by a measurable amount. Wipe the viewing area routinely using a soft
cloth dampened with concentrated detergent.
For additional information refer to the uv scanner manufacturers’ literature.
