Aprilaire 445a, 550a, 560a, 760a Owner's Manual
READ AND SAVE THESE INSTRUCTIONS
Owner’s Manual
For Models 110, 112, 220, 224, 350, 360, 440,
445, 448, 558, 560, 568, 760 & 768
Includes Safety & Operating Instructions
and Warranty Information
Humidifiers
TABLE OF CONTENTS
WARNING
120 volts may cause injury from electrical shock.
Disconnect power and shut off water supply before servicing.
CAUTION
Sudden operation may cause personal injury or
property damage. Turn humidistat or Humidifier Control to “OFF” or
lowest setting before servicing
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Operating Instructions
• Humidifier Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
• Manual Humidistat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Effect of Water Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Annual Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Annual Summer Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Periodic Preventative Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
MAINTENANCE INSTRUCTIONS
Models 110 & 112 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Models 220 & 224 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Models 350 & 360 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Model 440 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Models 445 & 448 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Reservoir Pump Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Model 558 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Models 560 & 568 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Models 760 & 768 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
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Thank you for your recent Aprilaire®Humidifier purchase. We sincerely
appreciate your business and are pleased to add your name to our
growing list of customers. With this purchase, you have invested in the
highest quality equipment currently available. Research Products
Corporation is the largest manufacturer of whole house humidifiers, air
cleaners and energy recovery ventilators and is a recognized leader in the
heating and air conditioning industry today.
Please be assured that in addition to product quality, we are also
committed to unit performance as well as customer satisfaction. Your unit
will require periodic maintenance to assure you of continued fine
performance. Please proceed as shown on page 8 to obtain service parts
and/or replacement Water Panel®evaporators.
Now, please take a few minutes and read the appropriate sections of this
booklet. This will familiarize you with the benefits you will receive from
the equipment you just purchased and help you understand the routine
maintenance that will be required. Be sure to register your humidifier with
us for our records and your protection. You may do so by registering
online at: www.aprilaire.com/warranty.
INTRODUCTION
Genuine Aprilaire Replacement Water
Panel
®
evaporators are available from your
installing contractor or from most other
heating and air conditioning contractors in
your area. Use the dealer locator in our
web site (www.aprilaire.com) or look in
the Yellow Pages under Humidifying
Apparatus or Heating & Air Conditioning
Contractors. Purchase only genuine
Aprilaire Water Panels to maintain peak
performance.
- 2 -
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 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 (except the Models 350 and 360) is installed to
operate in conjunction with the furnace blower motor. When the
humidistat or 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 evaporation
takes place. The now humidified air carrying moisture in vapor form
(nature’s own way) is circulated throughout the home.
The Models 350 and 360 use service hot water (140°F maximum) for its
heat source, as heat is needed for evaporation. While the water going to
the unit 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 included 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 units with a drain connection.
The drain also eliminates the problems caused by stagnant water. This is
the most effective and least expensive method to dispose of troublecausing minerals.
I. PRINCIPLE OF OPERATION
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Capacity is high because an average home (10,000 cu. ft.) requires the
addition of approximately 9 gallons of water per day to maintain 35%
relative humidity when the outside temperature is 20°. The smallest
Aprilaire Humidifier under most operating conditions, has this humidifying
capacity. Trouble-free performance and minimum maintenance are assured
by the design features of the Aprilaire Humidifier. All unit housing parts that
come in contact with water are non-metal and will never rust or corrode.
Neither heat nor water will affect them under normal operating conditions.
The Water Panel evaporator, designed especially for uniform, high
evaporation, along with the Scale Control Insert also efficiently traps
mineral deposits which are often the cause of damage to working parts in
ordinary humidifiers. No “white dust” can be distributed throughout the
living quarters. The Water Panel evaporator is the heart of the unit and
must be in good condition to assure high capacity trouble-free
performance. It should be changed annually.
Older design water distribution trays have a granular coating in the
bottom of the distribution tray to provide equal distribution of water to
each of the openings assuring an even flow over the Water Panel
evaporator. Do not clean the mineral scale off the bottom of the
water distribution tray at the end of the humidification season. If
the granular coating is removed, it is not necessary to purchase a new
distribution tray. You can accomplish the same uniform performance by
applying a small amount of liquid dishwashing soap over the entire inside
surface of the water distribution tray. This will allow the water to flow
evenly through each of the openings, provided the unit is level in order to
achieve maximum capacity.
The current distribution tray which incorporates a synthetic fabric liner
that replaces the granular coating, is designed to deliver water uniformly
over the entire top surface of the Water Panel evaporator, provided it is
mounted level. It is normal for some mineral deposits to form in the
distribution tray as it dries out between humidification cycles. These
deposits can actually help distribute water in the tray, but if they form
enough to block the openings, they should be removed as described in the
“Periodic Preventative Maintenance” section of this manual.
There are many humidifiers on the market. They all add moisture… with
varying degrees of efficiency. None, however, can provide the features,
design, and performance incorporated into your Aprilaire Humidifier.
TABLE 1 – Operation Guide
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There are two possible modes of operation of your Aprilaire Humidifier
Control - Automatic and Manual. An explanation of both follows:
Automatic Mode: (Manual Mode-see pg 6)
Your Humidifier Control is installed in the cold air return. During the first
heating season, your Humidifier Control needs to be set initially to
match your home’s condition. Please follow these steps when adjusting
your control (refer to Figure A).
1. Turn the dial setting knob to “5,” which is within the normal range.
During the next 24-48 hours it may be necessary to adjust the dial for
more or less humidity, depending on your personal comfort and home’s
requirements. Refer to the “Operation Guide” (Table 1).
2. During the coldest portion of the first heating season, minor
adjustments may be necessary. This is dependent upon your individual
home construction, refer to the “Operation Guide” (Table 1).
Condition Solution
Condensation on windows Reduce the setting on the control dial
by 1 increment.
Lack of humidity Increase the setting on the control dial
by 1 increment.
Humidifier does not operate Turn dial to “Test.” Make certain furnace
blower is operating and furnace is calling
for heat. If unit still doesn’t operate,
consult a heating contractor.
Humidifier won’t shut off Turn dial to “Off.” If unit continues to
operate, consult a heating contractor.
Test mode System operation is checked by setting the
knob to “Test.” Make certain furnace blower
is operating and furnace is calling for heat.
Humidifier will operate for one minute.
AUTOMATIC MODE
The relative humidity in your home
will now be accurately controlled
to meet your needs and should not
need further adjustment during
future heating seasons. Make note
of the dial setting in the event you
temporarily move the knob when
performing annual maintenance of
the Aprilaire Humidifier.
II. OPERATING INSTRUCTIONS- 448, 558, 568, 768
FIGURE A
6
L
A
M
R
5
O
N
4
3
2
7
T
e
s
t
Off
1
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