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WARNING
To avoid injury and the release of refrigerant into the
atmosphere, the refrigerant circuit of this unit must only be
serviced by technicians who meet local, state and federal
proficiency requirements.
WARNING
To prevent injury or death due to electrical shock or contact
with moving parts, open unit disconnect switch before
servicing unit.
Filters
Filter changes or cleanings are required at regular intervals. The
time period between filter changes will depend upon type of
environment the equipment is used in. In a single family home,
that is not under construction, changing or cleaning the filter every
60 days may be sufficient. In other applications such as motels,
where daily vacuuming produces a large amount of lint, filter
changes may be need to be as frequent as biweekly. See Fig. 1 and
2 for replacement filter sizes. Note that horizontal units containing
two filters are taped together at the factory to facilitate removal.
This should be done by end user as new filters are installed.
IMPORTANT: Units should never be operated without a filter.
CAUTION
Equipment should never be used during construction or
renovation due to possibility of contaminants entering the air
coil of the equipment which permanently affects the
performance and may shorten the life of the equipment.
Condensate Drain Pans
The condensate drain should be checked quarterly by cleaning and
flushing to ensure proper drainage.
Refrigerant System
Verify air and water flow rates are at proper levels before
servicing. To maintain sealed circuitry integrity, do not install
service gauges unless unit operation appears abnormal. Check to
see that unit is within the superheat and subcooling temperature
ranges shown in Tables 19-31. If the unit is not within these
ranges, recover and reweigh in refrigerant charge.
Compressor
Conduct annual amperage checks to ensure that amp draw is no
more than 10% greater than indicated on the serial plate data.
Fan Motors
All units have lubricated fan motors. Fan motors should never be
lubricated unless obvious, dry operation is suspected. Periodic
maintenance oiling is NOT recommended as it will result in dirt
accumulating in the excess oil and cause eventual motor failure.
Conduct annual dry operation check and amperage check to
ensure amp draw is no more than 10% greater than indicated on
serial plate data and to remove any build up on the blower
assembly.
Condensate Drain Cleaning
Clean the drain line and unit drain pan at the start of each cooling
season. Check flow by pouring water into drain. Be sure trap is
filled to maintain an air seal.
Air Coil Cleaning
Remove dirt and debris from evaporator coil as required by
condition of the coil. A 10% solution of dishwasher detergent and
water is recommended for cleaning both sides of the coil, followed
by a thorough water rinse. Clean coil with a stiff brush, vacuum
cleaner, or compressed air. Use a fin comb of the correct tooth
spacing when straightening mashed or bent coil fins.
Condenser Cleaning
Water-cooled condensers may require cleaning of scale (water
deposits) due to improperly maintained closed-loop water
systems. Sludge build-up may need to be cleaned in an open water
tower system due to induced contaminants.
Local water conditions may cause excessive fouling or pitting of
tubes. Condenser tubes should therefore be cleaned at least once a
year, or more often if the water is contaminated.
Proper water treatment can minimize tube fouling and pitting. If
such conditions are anticipated, water treatment analysis is
recommended. Refer to the Carrier System Design Manual, Part 5,
for general water conditioning information.
Follow all safety codes. Wear safety glasses and rubber gloves
when using inhibited hydrochloric acid solution. Observe and
follow acid manufacturer's instructions.
Clean condensers with an inhibited hydrochloric acid solution.
The acid can stain hands and clothing, damage concrete, and,
without inhibitor, damage steel. Cover surroundings to guard
against splashing. Vapors from vent pipe are not harmful, but take
care to prevent liquid from being carried over by the gases.
Warm solution acts faster, but cold solution is just as effective if
applied for a longer period.
GRAVITY FLOW METHOD
Do not add solution faster than vent can exhaust the generated
gases.
When condenser is full, allow solution to remain overnight, then
drain condenser and flush with clean water. Follow acid
manufacturer's instructions. (See Fig. 41.)
Fill condenser with
cleaning solution. Do
not add solution
more rapidly than
vent can exhaust
gases caused by
chemical action.
Vent
Pipe
3' To 4'
Fig. 41 — Gravity Flow Method
FORCED CIRCULATION METHOD
Fully open vent pipe when filling condenser. The vent may be
closed when condenser is full and pump is operating. See Fig. 42.
56
CAUTION
Pail
Funnel
1"
Pipe
5' Approx
Condenser
Pail
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