Cold Water Sump; Make-Up Valve - BAC VX Series Operation & Maintenance Manual

Cold Water Sump

The cold water sump should be inspected regularly. Any trash or debris
which may have accumulated in the sump or on the strainers should
be removed.
Each month, the entire cold water sump should be drained, cleaned,
and flushed with fresh water to remove the silt and sediment which
normally collects in the sump during operation. If not removed
periodically, this sediment can become corrosive and cause
deterioration of the protective finish. When flushing the sump,
the strainers should be left in place to prevent the sediment from
reentering the system. After the sump has been flushed, the strainers
should be removed, cleaned, and replaced before refilling the sump
with fresh water. The strainers can be removed by pulling the handle
up and away from the outlet connection.

Make-Up Valve

A float operated water make-up (See Figure 1) is furnished as standard
equipment on all units unless the unit has been ordered with an
electric water level control or for remote sump application. The float
controlling the valve is mounted on a threaded rod, held in place by
wing nuts to facilitate adjustment of the operating water level.
To make the initial setting, adjust the wing
nuts so that the make-up valve is completely
closed when the water level in the cold
water sump is 10mm below the overflow
level. This will ensure that the tower sump
contains enough water volume to prevent air
entrainment in the circulating pump during
system start-up. Under normal thermal load
and with average city water pressure at the
valve (15 to 50 psig), this setting should
produce an operating water level as shown in
Table 2 and Figure 1A.
Figure 1 - Water Make-up Valve Assembly
Maintenance Procedures
Cold Water Sump
Make-Up Valve
NOTE: Do not use acid to clean the
strainers.
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