User Manual

Page 3

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3. Startup

3.1 The startup of the humidiﬁ er is done as follows :

 Adjust the knob on the humidistat to the humidity level (percentage) desired.

 Conﬁ rm that the water supply valve is open.

 Put the main power ON at the electrical panel. The green pilot light comes ON on the LED panel. The

humidiﬁ er is ready to work.

Working Principle :

3.2 Unlike other types of humidiﬁ ers which produce humidity by passing warm air through a moist pad, Acu-

Steam produces humidity from steam dispersed directly into the supply duct.

3.3 A humidistat (installed either on the wall or the air return duct) controls the unit. You set the knob of the

humidistat according to your desired level of humidity (35-45% recommended). Please read the next section

about the Acu-Steam humidity control.

3.4 When the humidistat senses a need for humidity, it starts the humidiﬁ cation process.

3.5 The tank ﬁ lls with water.

3.6 The electronic control starts the blower fan in the furnace to move the air as the humidiﬁ er starts boiling

water and producing steam. If the fan cannot start (i.e. there is no air movement to transport the steam or

insufﬁ cient air pressure), the humidiﬁ er stops itself. Please note that it may take a few minutes to bring the

water to a boil. The steam exits the water tank through the steam hose, moves through the steam diffuser

installed in the warm air duct and is released into the duct where it mixes with the moving air.

3.7 As water evaporates, the electric valve opens as needed to replenish the water in the tank.

3.8 When the humidity reaches the desired level, the humidiﬁ er stops producing steam. In order to remove

scale and keep the tank as clean as possible, the humidiﬁ er drains after a certain number of steam producing

cycles (see section 18.5 on page 24 of install manual for more details).If there is still a demand from the

humidistat after draining, the tank reﬁ lls and starts to produce steam again. This process is part of the self-

cleaning feature.

3.9 When the humidistat is satisﬁ ed, the fan continues to run for a short period of time in order to eliminate

the steam from the ducts and the unit goes to ready mode, waiting for the next call from the humidistat.