Carrier Aquazone 50HQP Series Installation, Start-Up And Service Instructions Manual page 43

SERVICE
Perform the procedures outlined below periodically, as indicated.
IMPORTANT: When a compressor is removed from this unit,
system refrigerant circuit oil will remain in the compressor. To
avoid leakage of compressor oil, the refrigerant lines of the
compressor must be sealed after it is removed.
IMPORTANT: All refrigerant discharged from this unit must
be recovered without exception. Technicians must follow in-
dustry accepted guidelines and all local, state and federal
statutes for the recovery and disposal of refrigerants.
CAUTION
To avoid the release of refrigerant into the atmosphere, the
refrigerant circuit of this unit must only be serviced by
technicians which 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 servic-
ing unit.
Filters
Filters must be clean for maximum performance. Inspect filters
every month under normal operating conditions. replace when
necessary.
IMPORTANT: Units should never be operated without a filter.
Water Coil
Keep all air out of the water coil. Check open loop systems to be
sure the well head is not allowing air to infiltrate the water line.
Always keep lines airtight.
Inspect heat exchangers regularly, and clean more frequently if the
unit is located in a "dirty" environment. The heat exchanger
should be kept full of water at all times. Open loop systems should
have an inverted P trap placed in the discharge line to keep water
in the heat exchanger during off cycles. Closed loop systems must
have a minimum of 15 psig during the summer and 40 psig during
the winter.
Check P trap frequently for proper operation.
IMPORTANT: To avoid fouled machinery and extensive unit
clean-up, DO NOT operate units without filters in place.
DO NOT use equipment as a temporary heat source during
construction.
Condensate Drain Pans
Check condensate drain pans for algae growth twice a year. If al-
gae growth is apparent, consult a water treatment specialist for
proper chemical treatment. The application of an algaecide every
3 months will typically eliminate algae problems in most
locations.
Refrigerant System
Verify air and water flow rates are at proper levels before servic-
ing. To maintain sealed circuitry integrity, do not install service
gages unless unit operation appears abnormal.
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 condi-
tion of the coil. 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 de-
posits) 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 recom-
mended. 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. Failure to follow
these safety precautions could result in personal injury or
equipment or property damage.
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 manufac-
turer's instructions. See Fig. 33.
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. 33 — Gravity Flow Method
43
CAUTION
PAIL
FUNNEL
1"
PIPE
5' APPROX
CONDENSER
PAIL