BAC FXVT 288 Series Operating And Maintenance Instructions Manual page 21

The make-up assembly should be inspected monthly and adjusted as necessary. The valve itself should be
inspected annually for leakage and the valve seat replaced if necessary. The make-up water supply pressure
should be maintained between 100 and 450 kPa for proper operation of the valve.
The unit basin should be closely monitored and water level adjusted as necessary during the first 24 hours of
operation.
Water make-up valve assembly
1. Float ball
2. Float arm assembly
3. Float valve
CAUTION
Supply pressure for mechanical make-up valves should be between 1 and 3,5 bar.
To check the operating level, proceed as follows:
1. Measure height from sump bottom to water level and compare with face value from table.
2. Check valve for leakage and replace valve, if necessary.
3. Check that float arm can move freely and that float ball floats and closes valve.
4. Ensure that make-up water supply is adequate.
BLOW DOWN
In case of a continuous blow down with a metering valve in the bleed line, ensure that the valve is unobstructed
and that blow down water can drain freely. Measure the blow down flow rate by recording the time needed to fill a
given volume.
For automatic blow down using conductivity control, ensure that the conductivity probe is clean and that the blow
down solenoid valve is operational. Unless you have a specific adjustment procedure, your water treatment
company should check and adjust set points.
SUMP HEATER PACKAGE
Sump heaters must only operate in the winter to prevent the sump water from freezing, when the water pump(s)
and the fan(s) are shut off.
Under no circumstances should sump heaters operate at other times as they could potentially heat the water to
temperature levels, which are favourable to bacteriological growth. Ensure every six months the heater thermostat
is properly set and clean. Also ensure that control and safety devices, such as low level cut out switches, are
operational, clean and properly incorporated into the control circuit.
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5 Maintenance Procedures
5 Maintenance Procedures
W W W . B A L T I M O R E A I R C O I L . E U