Aprilaire 1770A, 1750A Overview, Whole-Home, see page, Spot, see page, Convertible, see page

OVERVIEW

The Aprilaire® Dehumidifier is designed to control humidity inside the whole home.. The dehumidifier uses a dew point calculation to control the humidity based on the dryness set point on the dehumidifier control.. An optional Model 70 Living Space Control or third-party control can be used in place of the onboard control..

The dehumidifier has a built in feature to allow air cycling or ventilation.. Air cycling allows activation of the HVAC fan to cycle air throughout the home for airflow balance and comfort.. Ventilation brings fresh air into the home and is designed to meet ASHRAE 62..2 Standard for Ventilation..

There are three main installation options, Whole-Home, Spot, and Convertible..

Whole-Home, see page 6 Spot, see page 8 Convertible, see page 10

SUPPLY DUCT

RETURN

DUCT

HVAC / FURNACE

DEHUMIDIFIER

90-1536

In a Whole-Home installation, the dehumidifier works in conjunction with the HVAC system, offering the optimum solution for year-round, whole-home control.. This installation is typically in basement or attic locations.. In

a typical setup, air is pulled from the return duct, dehumidified, and returned to the supply duct.. Alternate duct configurations are possible..

RETURN DUCT

SUPPLY DUCT

LIVING

SPACE

HVAC FURNACE

DEHUMIDIFIER

90-1536

In a Spot installation, the dehumidifier is not ducted to the HVAC system and is used to dehumidify a specific area.. This installation is typically in basements or crawl spaces, with the dehumidifier ducted to the area requiring dehumidification.. Grilles on the inlet and outlet are added to increase the pressure drop across the unit..

SUPPLY DUCT

RETURN

DUCT

90-1536

In a Convertible installation, the dehumidifier controls humidity in both whole-home

and spot locations.. The dehumidifier will dehumidify the whole home as the first priority, switching to the spot location after the whole-home dehumidification need has been met..

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