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9.5 - 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.
9.6 - 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.
Use standard coil cleaning procedures which are compatible
with both the heat exchanger material and copper water lines.
Generally, the more water flowing through the unit, the less
chance for scaling, however flow rates over 0.0538 l/s per kW
can produce water (or debris) velocities that can erode the heat
exchanger wall and ultimately produce leaks.
Proper water treatment can minimise 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. Vapours 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.
9.6.1 - 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. 18).
9.6.2 - 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. 19).
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 con-
denser and flush with clean water. Follow acid manufacturer’s
instructions.
9.7 - Condensate pans
Check condensate drain pans for algae growth every three
months. If algae growth is apparent, consult a water treatment
specialist for proper chemical treatment. The application of an
algaecide every three months will typically eliminate algae
problems in most locations. Check condensate hose for leaks
and blockage and correct any problems.
9.8 - Blower motors
All units have lubricated fan motors. BLOWER MOTORS
SHOULD NEVER BE LUBRICATED UNLESS OBVIOUS,
DRY OPERATION IS SUSPECTED. Periodic maintenance
oiling is not recommended because it will result in dirt accumu-
lating on 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 that indicated by serial
plate data.
9.9 - Compressor
Conduct an amperage check annually on the compressor and
fan motor. Amperage draw should not exceed normal full load
amps. Maintain a log of amperage to detect deterioration prior
to component failure.
Fig. 18 - Gravity flow method
Fig. 19 - Forced circulation method
FILL CONDENSER WITH
CLEANING SOLUTION. DO
NOT ADD SOLUTION
MORE RAPIDLY THAN
VENT CAN EXHAUST
GASES CAUSED BY
CHEMICAL ACTION.
PAIL
FUNNEL
CONDENSER
PAIL
3’ TO 4’
VENT
PIPE
5’ APPROX
1”
PIPE
Fill condenser with cleaning
solution. Do not add solution
more rapidly than vent can
exhaust gases caused by
chemical action.
Pail
Funnel
25 mm
pipe
1.5 m approx.
Condenser
Pail
Vent pipe
0.9 to 1.2 m
SUCTION
PUMP
SUPPORT
TANK
FINE MESH
SCREEN
RETURN
GAS VENT
PUMP
PRIMING
CONN.
GLOBE
VALVES
SUPPLY
1” PIPE
CONDENSER
REMOVE WATER
REGULATING VALVE
Pump
Suction
Pump
support
Tank
Fine mesh
screen
Return
Remove water
regulating valve
Condenser
25 mm
pipe
Supply
Globe
valves
Gas vent
Priming
connection