Principle Of Operation - Aprilaire 350 Owner's Manual

TABLE OF CONTENTS

PRINCIPLE OF OPERATION

With your purchase of this humidification system, you have invested in a
humidifier that operates on the evaporative principle – nature's own way of
adding moisture – providing optimum relative humidity throughout 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 answer
these questions.
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 optimum
relative humidity for maximum allowable comfort all winter long.
The important considerations in the evaluation of a humidifier are precise
control, sufficient capacity, trouble-free performance and minimum
maintenance. The operating principle of your Aprilaire humidifier provides
all of these advantages. Here, briefly, is the method:
Except for Models 350 and 360, 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 humidifier. 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 humidifier. Dry, hot air is moved through the
moisture-laden Water Panel evaporator where natural evaporation takes
place. The now-humidified air carrying moisture in vapor form (nature's own
way) is circulated throughout the home.
Models 350 and 360 use service hot water (140°F maximum) for a heat
source, as heat is needed for evaporation. While the water going to the
humidifier is hot, the flushing water to the drain will be cold. The heat is
extracted during the evaporation process.
The correct water flow is determined by an orifice equipped with
each drain type humidifier. When the humidifier 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 open or closed.
- 1 -
®