Aprilaire 850 Specifications download pdf (Page 19)

APRILAIRE EVAPORATIVE

The water that is not evaporated passes on to the drain in the drain equipped models. Trouble-causing minerals that

are the inevitable result of water evaporation are either trapped by the Water Panel, contained in the Scale Control

Insert, or flushed down the drain.

Duct Location

Fan Powered humidifiers are designed to be installed on the warm air supply plenum of forced air up-flow furnace or

heat pumps. They can not be installed on a horizontal system due to reduced capacity. If there is no space on the

warm air supply plenum for the humidifier, the unit may be installed on the cold air return duct; however, you will need

to supply the humidifier with hot water because the hot water will be the only heat source.

Bypass Humidifiers are designed to be installed on the warm air supply plenum

or cold air return of a forced air up-flow, or down-flow, horizontal furnace or heat

pump. The humidifier is then ducted to the opposite side return or supply. The

operation is the same regardless of which duct is used for the installation. The

connection requires a minimum static pressure of 0.2” w.c. in order for air to flow

properly through the connection.

Water Quality

Evaporative humidifiers will perform with hard or

soft and hot or cold water. It’s recommended 140˚ F

water be used for optimum performance and

anytime the humidifier will operate without a call

for heat.

Maintenance

The life of the Water Panel evaporator will vary with

the hardness of the water, the amount of use, and

the application. When openings become clogged

and restrict the air-flow through the panel, it should

be replaced. For best performance, we recommend that you replace the Water Panel evaporator at least annually with

the exception of the Models 400 and 400M which should be changed at least twice per heating season. Replace with only

genuine Aprilaire Water Panels

for continued peak efficiency and overall performance. The Water Panel

evaporator

must be installed with the colored spot at the top and must be entirely enclosed in the scale control insert.

If the humidifier is equipped with a Automatic Digital Humidifier Control with Water Panel change indicator, after

replacing the Water Panel, turn the control knob to the “test/Reset” position unit the “humidifier on” light blinks to reset

its timer.

Get green

with greater comfort from Aprilaire

Whether you’re updating a home to be more healthy, energy-efficient and

sustainable or building a new green-certified home, Aprilaire offers a complete

line of innovative products designed to improve the quality of indoor air.

Our humidifiers help by ensuring that the entire home has just the right amount

of moisture for the ultimate in protection and comfort. Whole-house humidifiers

help prevent premature aging of the home’s structure, provide optimum comfort

and can protect respiratory systems against viruses and bacteria. Humidity control

helps qualify the home for the Green-Built Certification Program of the National

Association of Home Builders.

Upflow (Power)

Horizontal (Bypass)

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Aprilaire 850 Specifications Page 19

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