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Water Distribution System
The spray water is distributed through a corrosion
resistant polyvinyl chloride (PVC) distribution
system. Inspect the spray nozzles at least quarterly
and clean as necessary. The design of the HXV
allows for the inspection of the water distribution
system while the unit is fully operational. The fan
motors may continue to operate while external
inspection of distribution system is underway.
The inspection procedure is as follows:
• Ensure the spray pump is running.
• Check to see if the nozzles are producing the spray pattern shown in Figure 7.
• Clean any nozzles which are clogged. If necessary, the nozzle and rubber grommet may
be removed for cleaning.
• Inspect the coil surface. Any corrosion, damage, or obstructions must be corrected.
Water Level Control
There are two types of water level controls used on BAC cooling units:
• Mechanical make-up valve assembly
• Optional electric water level control package
Mechanical Make-up Valve Assembly
A float-operated mechanical water make-up assembly is furnished as standard equipment
on the unit. The standard make-up assembly consists of a corrosion resistant make-up valve
connected to a float arm assembly actuated by a polystyrene-filled plastic float. The float
is mounted on an all-thread rod held in place by wing nuts. The cold water basin operating
water level can be adjusted by repositioning the float and all-thread rod using the wing nuts
provided.
• Inspect the make-up valve assembly monthly and adjust if necessary.
• Inspect the valve annually for leakage. Replace the valve seat if necessary.
• Maintain the make-up water supply pressure between 15 psig and 50 psig for proper
operation. BAC recommends a surge protector (provided by others) for pressures over 50 psig.
• Set the initial basin water level by adjusting the wing nuts, so that the make-up valve
is completely closed when the water level in the cold water basin is at the overflow
connection.
• With the design thermal load and the average water pressure (15 to 50 psig) at the
valve, the above setting procedure will result in an operating water level near design,
although some adjustment may still be required.
• If the thermal load is less than the design load at the time of unit start-up, the
procedure may produce operating levels greater than design. If operating levels are
higher than design, readjust the float in order to attain the recommended operating level
as stated in Table 2.
• During the first 24 hours of operation, closely monitor the water level in the cold water
basin and adjust the level if necessary.
Figure 7. Nozzle Spray Pattern
Detailed Component
Maintenance
Procedures
Heat Transfer Section
Fill & Drift Eliminators,
Combined Inlet Shields, and
Hail Guards
Water Distribution System
Water Level Control
Mechanical Make-up Valve
Assembly
NOTICE: Do not use steam or
high pressure water to clean PVC
eliminators or materials other
than steel.
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