Sequence of Operation
Sequence of Operation | 8
2594949_B_EN_2005_Condair-RH_OM
Condair RH
VAC
4
1
2
5
6
3
Figure 5 - Sequence of Operation
1. Fill valve
2. Fill cup
3. Drain valve
4. Cylinder
5. Steam distributor
6. Drain pan
Summary
Water flows into the humidifier through the fill valve and into the fill cup (with an air gap to prevent back-
flow). From the fill cup, water flows to the drain valve and into the cylinder. Excess water (due to a
blockage in the cylinder, for example) flows from the fill cup to the drain pan.
Water enters and drains from the steam cylinder through the drain valve. During the draining sequence,
hot water from the cylinder and cold water from the fill cup mixes. The cold water tempers the hot water
so that the water exiting to the drain is cooled to 140 °F (60 °C).
In the steam cylinder, electrodes cause water to boil (heat generated from the electrical resistance of
the water). Steam forms and flows through the top of the cylinder and out through the steam outlet. It
then flows through the steam hose, and into the steam distributor. The steam distributor is installed in
your duct ventilation system.
Some condensate is formed while steam travels through the steam hose. Typically, condensate will
travel back down the hose and return to the steam cylinder. Other times (ex. in remote installations),
condensate may get trapped inside a long run of steam hose. In this situation, a condensate return line
should be installed (supplied by others) to prevent standing water in the steam hose. The condensate
return line returns water to the fill cup, external drain, or high-temperature condensate pump.
Steam Generation
Once the unit receives a demand signal and the safety loop (SC on the control board) is closed, the
humidifier closes the contactor and measures the electrical current between the electrodes in the steam
cylinder (amp/current draw).
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 the heat
boils the water into 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 electrical
current matches demand or the high water sensor detects a high water level.
The humidifier repeats the fill and boil down cycle repeatedly to match output to demand.
Over time minerals in the water will form scale on the cylinder electrodes. The humidifier will
automatically fill to a higher water level to maintain full capacity during the life of the cylinder. Eventually
Summary of Contents for HumiLife RH Series
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