INTRODUCTION
Thank you for your recent Aprilaire® humidifier purchase. We appreciate 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 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).
PRINCIPLES OF OPERATION
The Aprilaire® Steam Humidifier delivers humidity in the form of steam to
the conditioned space via the HVAC system duct or Aprilaire Fan Pack. The
humidifier generates steam by energizing 2 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 the
dispersion tube and tubelets distribute steam over a wide area in the duct and
direct any condensed moisture back into the steam hose.
OUTLET
SUPPLY
WATER
DRAIN CUP
CANISTER
HIGH WATER
LEVEL SENSOR
FLOW CONTROL
ORIFICE
INLET
FILL VALVE
OVERFLOW
FILL
90-1522
FIGURE 1 – FILL AND DRAIN SYSTEM AND CANISTER
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.
English 54 English
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