resideo M35758A, Homeowners Operating Manual, Page: 6 / 48

INTRODUC
TION
Steam Generation
• Once the unit receives a demand signal and the safety loop between terminal 1 and 2 is closed, the
humidifier closes the contactor and measures the electrical current.
• If the demand is lower than the actual output the inlet valve is kept closed and output is reduced by letting
the water level in the cylinder decrease by evaporation.
• If demand is higher than the actual output, after a brief delay the fill valve is activated and water flows into
the fill cup. Water from the fill cup flows into the bottom of the cylinder through a hose connected to the
drain valve housing.
Note: The cylinder is gravity fed from the fill cup. If backpressure from the steam line is too high it will cause
water to back up in the fill cup and flow down the overflow line to the drain.
• As soon as the water in the cylinder comes in contact with the energized electrodes, current flows through
the water. The resistance of the water to the electrical charge generates heat and in turn steam. The
electrical current (and steam output) increases as the level of water increases, as more of the electrode
becomes submerged. The unit continues to fill until the current matches demand or the high water sensor
detects a high water level.
• The Electrode Steam repeats the fill and boil down cycle repeatedly to match output to demand.
• Over time minerals in the water will adhere to the cylinder electrodes. The humidifier will automatically fill
to a higher water level to maintain full capacity during the life of the cylinder. Eventually because of scale
formation it will no longer be possible for the humidifier to reach its full capacity. The Electrode Steam
software monitors this condition and, when detected, will stop operating and flash the yellow LED in a
repeating sequence of 4 flashes.
Drains
• As steam is produced, minerals are left behind, increasing the conductivity of the water. The Electrode
Steam patented auto adaptive cycle will monitor the water conductivity and perform drains to maintain the
water at optimal conductivity for peak performance.
• The auto adaptive cycle ensures cylinder life is maximized. It does this by keeping the tightest control and
most efficient use of water during the entire cylinder life.
Steam Distribution
Steam generated by the humidifier may be introduced into the air in several different ways. The most
common method for adding the steam into the air is to mount a steam distributor tube in a supply air duct.
Steam Line
The steam line between the cylinder steam outlet and the distributor serves two purposes: it is used as a
conduit to transfer the atmospheric steam from the humidifier to the distributor, as well as providing a means
to remove condensate.
Condensate Return
Whenever steam is distributed condensate is formed in the distribution system. Insulating steam lines is one
important way to reduce the amount of condensate formed. Steam lines are sloped so that condensate does
not collect in the lines and create a restriction to steam flow. The condensate must be collected and removed
from the system so that it does not build up and leak into the duct. Condensate can be returned to the
Electrode Steam fill cup to reduce water waste or can be fed to drain.
How does the Electrode Steam work?
Steam Humidification System 33-00165EFS—03
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