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INTRODUCTION
Thank you for your recent Aprilaire
your business and are pleased to add your name to our growing list of
customers . You have invested in the highest quality equipment available .
Aprilaire manufactures whole-house indoor air quality products and is a
recognized leader in the heating and air conditioning industry .
Your humidifier will require periodic maintenance to assure continued
consistent performance . See page 20 .
Please take a few minutes and read this booklet . This will familiarize
you with the benefits you will receive from the humidifier and help you
understand the routine maintenance that will be required .
Be sure to register your humidifier warranty online at:
www.aprilaire.com/warranty .
genuine Aprilaire Replacement Model 80 Steam Canisters are
available from your installing contractor or from most other heating
and air conditioning contractors in your area. Use the dealer locator on
our web site (www.aprilaire.com) or look in the Yellow Pages under
Humidifying Apparatus or Heating & Air Conditioning Contractors.
PRINCIPLES OF OPERATION
The Aprilaire
Steam Humidifier delivers humidity in the form of steam to
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the conditioned space via the HVAC system duct or Aprilaire Fan Pack . The
humidifier generates steam by energizing two electrodes that extend into a
canister of water . Current flowing between the electrodes causes the water
to boil, creating steam . Water is introduced to the humidifier through a fill
valve to a fill cup located in the top of the cabinet . The fill cup serves as
an overflow reservoir and provides an air gap between the humidifier and
water source . The steam canister is filled from the bottom . The canister is
seated in a drain cup assembly which includes a drain valve . The drain and
fill valves work together to maintain water level in the canister to deliver
the rated steam capacity based on the electrical conductivity of the water
and to temper drain water . See Figure 1 for representation of fill and
drain system and canister .
Steam is delivered into the airstream through a dispersion tube mounted
in the HVAC system ductwork . Openings in the dispersion tube are fitted
with "tubelets
" which extend into the center of the tube . The design of
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the dispersion tube and tubelets distribute steam over a wide area in the
duct and direct any condensed moisture back into the steam hose .
humidifier purchase . We appreciate
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- 4 -
FIgURE 1 – Fill and Drain System and Canister
Fill Cup
Overflow
Flow Control
Orifice
Fill
Inlet
Fill Valve
Supply
Water
SEQUENCE OF OPERATION
When the Humidifier Control detects the need for humidity, and provided
the humidifier is turned on and the HVAC system blower is operating,
the internal controller in the humidifier energizes the electrodes and
measures the current flowing through the water between them . The
controller adjusts water level in the canister via a fill valve and a drain
valve to maintain a constant current . The operating water level in the
canister depends on the mineral content of the water which determines
conductivity .
Steam
Outlet
High Water
Level Sensor
Electrodes
Canister
Drain Valve
Drain Cup
Drain
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90-1522
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