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INTRODUCTION
Thank you for your recent steam 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 .
Your humidifier will require periodic maintenance to assure continued
consistent performance . See page 10 .
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 .
Replacement Steam Canisters are available from your installing
contractor. Use only genuine replacement part number 8045HUM.
PRINCIPLES OF OPERATION
The Steam Humidifier delivers humidity in the form of steam to the
conditioned space via the HVAC system duct . 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
™
the dispersion tube and tubelets distribute steam over a wide area in the
duct and direct any condensed moisture back into the steam hose .
- 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 humidity below the set point,
and provided the humidifier is turned on and the indoor unit 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 .
A relay is provided with the humidifier that will allow the control to turn
on the indoor unit blower when a call is made for humidity .
Steam
Outlet
High Water
Level Sensor
Electrodes
Canister
Drain Valve
Drain Cup
Drain
- 5 -
90-1522
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