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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: 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.
IMPORTANT: All refrigerant discharged from this unit must
be recovered without exception. Technicians must follow
industry accepted guidelines and all local, state and federal
statutes for the recovery and disposal of refrigerants.
WARNING
To prevent injury or death due to electrical shock or contact
with moving parts, open unit disconnect switch before
servicing unit.
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.
CAUTION
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.
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.
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.
CAUTION
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. 26.)
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. 26 — 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. 27.) Regulate flow to condenser with a supply line valve. If
pump is a non-overloading type, the valve may be fully closed
while pump is running.
For average scale deposit, allow solution to remain in condenser
overnight. For heavy scale deposit, allow 24 hours. Drain
condenser and flush with clean water. Follow acid manufacturer's
instructions.
Priming
Pump
Conn.
Suction
Pump
Support
Tank
Fine Mesh
Screen
Fig. 27 — Forced Circulation Method
37
Pail
Funnel
1"
Pipe
5' Approx
Condenser
Pail
Gas Vent
Globe
Va lves
Supply
1" Pipe
Condenser
Remove Wa ter
Regulating Va lve
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