Aprilaire 600 - Manual (Page 4)

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With your purchase of a humidification system, you have invested in a
humidifier that operates on the evaporative principle – nature’s own way
of adding moisture – and will provide the proper relative humidity all
during the heating season. It is very possible that you have questions
concerning your new humidifier – questions on what it can do for you, and
what you should do to receive maximum benefits from it. This booklet is
intended to help you do exactly that.
Nature, in producing an invigorating comfortable April day, combines just
the right temperature and the right amount of moisture. Aprilaire
Humidifiers employ the same principle, with refinements, to give you the
proper relative humidity for maximum allowable comfort all winter long.
The important considerations in the evaluation of a humidifier are Positive
Control, Sufficient Capacity, Trouble-free Performance and Minimum
Maintenance. The operating principle of your Aprilaire provides all of
these advantages. Here, briefly, is the method:
The Aprilaire Humidifier is installed to operate in conjunction with the
furnace blower motor. When the Aprilaire Humidifier Control calls for
humidity and the blower motor is operating, water flows to the
distribution tray located at the top of the unit. The water is uniformly
distributed across the width of the tray and through a scientifically
designed system of outlets. It flows by gravity over the Water Panel
®
evaporator, the heart of the unit. Dry, hot air is moved through the
moisture-laden Water Panel evaporator where the evaporation takes
place. The now humidified air carrying moisture in vapor form
(nature’s own way) is circulated throughout the home.
The correct water flow is determined by an orifice equipped with
each drain type unit. When the unit is operating, there will be a small,
steady stream of water to drain, which flushes away most of the
trouble-causing minerals. Do not use the saddle valve to regulate the
water flow. It is designed to be completely opened or closed. The minerals
and solid residue not trapped by the replaceable Water Panel evaporator are
flushed down the drain. In the Models 550, 600 and 700. The drain also
eliminates the problems caused by stagnant water. This is the most effective
and least expensive method to dispose of trouble-causing minerals.
There are some homes where drain facilities are not accessible or
available. For these situations, or where high water hardness is not a
problem, the newest Aprilaire, Model 400, is designed to satisfy these
applications.
I. PRINCIPLE OF OPERATION