IOM 1206-1
67
Unit Maintenance
out surface with no areas missed. This may be
accomplished by use of a pump-up sprayer or
conventional spray gun. The method does not matter, as
long as the entire area to be cleaned is wetted. After the
substrate has been thoroughly wetted, the salts will be
soluble and is now only necessary to rinse them off.
3
Rinse - It is highly recommended that a hose be used as a
pressure washer will damage the fins. The water to be
used for the rinse is recommended to be of potable
quality, though a lesser quality of water may be used if a
small amount of CHLOR*RID DTS is added. Check
with CHLOR*RID International, Inc. for
recommendations on lesser quality rinse water.
Cautions
Harsh Chemical and Acid Cleaners
Harsh chemicals, household bleach or acid cleaners should not
be used to clean outdoor or indoor ElectroFin Coated Coils.
These cleaners can be very difficult to rinse out of the coil and
can accelerate corrosion and attack the ElectroFin coating. If
there is dirt below the surface of the coil, use the
recommended coil cleaners as described above.
High Velocity Water or Compressed Air
High velocity water from a pressure washer or compressed air
should only be used at a very low pressure to prevent fin and/
or coil damages. The force of the water or air jet may bend the
fin edges and increase airside pressure drop. Reduced unit
performance or nuisance unit shutdowns may occur.
Optional High Ambient Control Panel
Consists of exhaust fan with rain hood, two inlet screens with
filters, necessary controls and wiring to allow operation to
125
°
F (52
°
C). The option can be factory or field installed as a
kit.
•
It must be supplied on units operating at ambient
temperatures of 105
°
F (40.6
°
C) and above.
•
It is automatically included on units with fan VFD (low
ambient option).
•
Check inlet filters periodically and clean as required. Verify
that the fan is operational.
Liquid Line Sight Glass
The refrigerant sight glasses should be observed periodically
(a weekly observation should be adequate). A clear glass of
liquid indicates that there is subcooled refrigerant charge in the
system. Bubbling refrigerant in the sight glass, during stable
run conditions, indicates that the system can be short of
refrigerant charge. Refrigerant gas flashing in the sight glass
could also indicate an excessive pressure drop in the liquid
line, possibly due to a clogged filter-drier or a restriction
elsewhere in the liquid line.
See Table 22, Filter-Drier Pressure Drop on page 78 for
maximum allowable pressure drops. If subcooling is low, add
charge to clear the sight glass. If subcooling is normal (15 to
20 degrees F) and flashing is visible in the sight glass, check
the pressure drop across the filter-drier. Subcooling should be
checked at full load with 70
°
F (21.1
°
C) ambient temperature,
stable conditions, and all fans running.
An element inside the sight glass indicates the moisture
condition corresponding to a given element color. If the sight
glass does not indicate a dry condition after about 12 hours of
operation, the circuit should be pumped down and the filter-
drier changed or verify moisture content by performing an acid
test on the compressor oil.
