Airedale SmartCool 11-233kW - Manual (Page 162)

SmartCool
TM
- D Precision Air Conditioning
162
Precision Air Conditioning
Installation, Maintenance and Commissioning Manual :6877419 02/2013
Commissioning Data
Humidifier
Initial Start-up Initially the humidifier cylinder will be empty. The cylinder will then fill with water from the
tundish until sufficient current is passed between the electrodes, at which point the feed
solenoid valve will close.
During the start up phase, the current will remain low until either;
there is a sufficient concentration of conductive salts built up within the bottle
Or
the immersion level of the electrodes is enough to pass the required current.
As a guide, 1 amp of current passed between the electrodes will generate approximately
1kg/hr of steam.
The desired operating current is reached; the process taking a few minutes or several
hours according to the hardness of the water. This time period may take several hours in
soft water areas or a matter of minutes in hard water areas. The water conductivity levels
(hardness/softness) can be viewed from the
display keypad.
It is important to have the correct bottle conductivity range selected in the
controller. Mismatched information may cause the humidifier to malfunction.
Sizes 6 - 26 Sizes 28 - 31 Sizes 35 - 60
Humidifier Capacity kg/hr 0.6 - 3.0 1.6 - 8.0 3.0 - 15.0
Normal Operation Once the start-up period has been completed, the cylinder will operate automatically,
ensuring the correct quantity of steam is delivered.
CAUTION All humidifiers provide variable steam production as standard.
Once this current value is exceeded with a cylinder in normal operation, the drain solenoid
energises to allow the high salt content water to drain. During this process the power
supply to the bottle is cut.
After this pre-set time the drain solenoid will close and the feed valve will open until the
correct water operating level is reached. The water being below its boiling point will then
re-heat and continue to produce steam at the correct output.
The humidifier will then operate to the humidifier setpoint.
As the electrodes become scaled the electronic sensing device allows the conductivity
(mineral content of the water in the cylinder) to gradually rise keeping the current
reasonably static at the desired value.
Once the electrodes become badly corroded or there is sufficient build up of scale, an
alarm (bottle change) will be initiated to the microprocessor necessitating a bottle change.
When this has been carried out the initial start-up sequence is repeated and normal
running resumed.
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