23
23
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 will produce operating water levels as stated in
• 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 those shown in
operating levels are higher than specified, readjust the float in order to attain the
recommended operating level.
• Closely monitor the water level in the cold water basin and adjust the level if necessary
during the first 24 hours of operation.
• Operating at the recommended water level will ensure that the unit basin contains
sufficient water volume to prevent air entrainment in the circulating pump during
system start-up and provides sufficient excess basin capacity to accept the total
system pull-down volume.
NOTE:
If the unit has been ordered
with the optional electric water
level control package or is intended
for remote sump application, a
mechanical water make-up valve
will not be provided.
Detailed Component
Maintenance
Procedures
Water Level Control
Mechanical Make-up Valve
Assembly
Optional Electric Water Level
Control Package
