3. Measure height from sump bottom to water level and compare with face value from table.
4. Check valve for leakage and replace valve, if necessary.
5. Check that float arm can move freely and that float ball floats and closes valve.
6. Ensure that make-up water supply is adequate.
This procedure does not apply for
•
equipment equipped with electrical water level control
•
remote sump applications
If a float operated water make-up is used, initial setting and regular adjustments are needed.
The float controlling the make-up valve is mounted on a threaded rod, held in place by wing nuts. (see figure below)
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 make the initial basin water level setting, fill the sump with water until 2 cm above operating level. Adjust the
wing nuts of the float ball so, that the make-up valve is completely closed.
Before starting the unit for the first time, fill the sump till 1 cm below overflow level (push float ball under).
Under normal load conditions this setting should produce the correct operating level. At low load conditions the
operating level will rise and needs to be adjusted.
The unit basin should be closely monitored and water level adjusted as necessary during the first 24 hours of
operation.
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.
W W W . B A L T I M O R E A I R C O I L . E U
17
5 Maintenance Procedure
5 Maintenance Procedure
