Condensate Drains; Water-Cooled Condensers; Gravity Flow Method (Fig. 85); Forced Circulation Method (Fig. 86) - Carrier Omnizone 50BVC Installation, Start-Up, Service And Controls Operation And Troubleshooting

Condensate Drains

Clean the drain line and unit drain pan at the start of each cooling
season. Check flow by pouring water into the drain.

Water-Cooled Condensers

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 tower system
due to inducted contaminants.
Local water conditions may cause excessive fouling or pitting of
tubes. Condenser tubes should 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 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.
Isolate the supply and return water connections when removing
piping to the condenser.
Clean condensers with an inhibited hydrochloric acid solution.
The acid can stain hands and clothing and attack concrete, and,
without inhibitor, can attack 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 gases.
Warm solution acts faster, but cold solution is just as effective if
applied for a longer period.

GRAVITY FLOW METHOD (FIG. 85)

Do not add solution faster than the vent can exhaust the generated
gases.
When condenser is full, allow the solution to remain overnight;
then drain the condenser and flush with clean water. Follow acid
manufacturer's instructions.

FORCED CIRCULATION METHOD (FIG. 86)

Fully open the vent pipe when filling the condenser. The vent may
be closed when the condenser is full and the pump is operating.
Regulate the flow to the condenser with a supply line valve. If the
pump is the non-overloading type, the valve may be fully closed
while the pump is running.
For average scale deposit, allow the solution to remain in the con-
denser overnight. For heavy scale deposit, allow a full 24 hours.
Drain the condenser and flush with clean water. Follow acid man-
ufacturer's instructions.
CAUTION
Fig. 85 — Gravity Flow Method
Fig. 86 — Forced Circulation Method

Fan Motor Lubrication

The fan motor was properly lubricated at the time of manufacture.
Lubricate the fan motor(s) with SAE-20 (Society of Automotive
Engineers) non-detergent electric oil.
IMPORTANT: PILLOW BLOCK STYLE FAN BEARINGS:
Bearings have been prelubricated with high quality grease.
Bearings must be relubricated once every 6 months or every
2500 hours of operation, whichever comes first.
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