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SPECIFICATIONS & DIMENSIONS
TABLE 1 – Specifications
Voltage kW
Maximum
steam capacity
Nominal Current draw
(amps)
Humidifier unit
operating weight
gal/day amps lbs
120V 1.4 11.5 11.5 23
208V 2.4 20.5 11.5 23
240V 2.8 23.3 11.5 23
The Aprilaire
®
Model 800 Canister Steam Humidifier delivers
humidity in the form of steam to the conditioned space via
the HVAC system duct or optional Aprilaire Model 850 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 the dispersion tube and
tubelets distribute steam over a wide area in the duct and
direct any condensed moisture back into the steam hose.
PRINCIPLES OF OPERATION
FIGURE 1 – Fill and Drain System and Canister
90-1522
Steam
Outlet
Drain
Supply
Water
Drain Cup
Drain Valve
Canister
Electrodes
High Water
Level Sensor
Flow Control
Orifice
Inlet
Fill Valve
Overflow
Fill
Fill Cup
3