Mechanical Installation, Whole-Home installation

MECHANICAL INSTALLATION (continued)

DRAIN

1.Adjust feet of dehumidifier to allow a 2-1/2” minimum clearance for drain trap.. See Figure 6.. Use the 90° elbow if necessary for clearance restrictions.. See Figure 7..

2.Use PVC primer and cement for drain assembly to the dehumidifier drain outlet..

3.Complete assembly by piping the 3/4” PVC trap to a drain or condensate pump.. Make sure the drain line has a constant downward slope and is not kinked..

4.To prime the drain trap and to verify the drain line is not blocked, slowly pour a pint of water into the dehumidifier drip pan located below the coil..

CAUTION

1.Drain trap must be primed with water before use.

2.A condensate pan with a float switch is required in attic installations.

Figure 6 – Drain Trap

Drain Outlet
High Side	Arrows on
Drain Trap	trap show
	water flow
	direction

2-1/2	Low Side
	Low Side
	90-961
Figure 7 – Drain Trap with 90° Elbow
	Drain Trap
90° PVC Elbow
High Side	Low Side
	90-961

Float Switch

If the dehumidifier is installed in an attic or another location requiring leak protection, the unit should be placed in a condensate pan with a normally closed, condensate overflow safety switch (float switch).. Remove the jumper from the float switch terminals on the control board and wire the float switch to the terminals.. See Figure 8..

Whole-Home installation

Figure 8 – Float Switch Wiring

FLOAT

SWITCH

LOW VOLTAGE NORMALLY

CLOSED FLOAT SWITCH

90-1429

This installation is used when the HVAC equipment conditions the whole home.. Using the dehumidifier in conjunction with the HVAC system is the optimum solution for year-round, whole-home control.. This installation is typically in basement or attic locations.. Ducting the unit to the return and supply, where air is pulled from the return duct, dehumidified, and discharged to the supply duct, is the most common setup.. Additional configurations include only ducting the dehumidifier outlet to the supply or ducting the inlet and outlet to the return duct.. In the latter case, the HVAC fan must be activated during dehumidification..

Required Components

Duct Work

18 – 22 AWG Wire

Optional Components

Condensate Pan & Normally Closed Float Switch

Model 70 Living Space Control

Third-Party Control

1770A, 1750A specifications

The Aprilaire 1750A and 1770A are advanced dehumidifiers designed to enhance indoor air quality by effectively managing humidity levels in residential settings. These models stand out for their efficiency and durability, making them popular choices for homeowners seeking to create a comfortable living environment.

One of the main features of the Aprilaire 1750A is its ability to remove up to 70 pints of moisture per day, while the slightly larger 1770A can handle up to 90 pints. This powerful moisture removal capacity makes both models particularly suitable for larger homes or spaces prone to high humidity, such as basements and attics.

In terms of technology, both units utilize a robust and energy-efficient compressor system that operates quietly, ensuring minimal disruption during their operation. The dehumidifiers are designed with an innovative control system that allows for humidity settings to be easily adjusted, providing users with full control over their indoor environment. This intelligence enables the units to efficiently operate only when necessary, resulting in significant energy savings.

The Aprilaire 1750A and 1770A feature an automatic drain option, allowing for continuous operation without the need for frequent manual emptying of the water reservoir. This functionality is particularly beneficial in high-humidity areas where regular monitoring may be cumbersome. Homeowners can also appreciate the unit’s easy-to-clean filter, which helps maintain efficient performance and prolongs the life of the dehumidifier.

Both models come equipped with an integrated humidity sensor, which actively monitors the humidity levels in the home. This allows the units to adjust their operation automatically based on the current conditions, optimizing moisture removal while maintaining energy efficiency. The sleek and compact design of the Aprilaire models ensures they can fit unobtrusively into most spaces, while durable construction materials guarantee long-lasting performance.

Moreover, the Aprilaire 1750A and 1770A models are backed by a comprehensive warranty, offering peace of mind to homeowners investing in their comfort and health. Overall, these dehumidifiers are excellent choices for anyone looking to improve air quality and create a healthier, more comfortable indoor atmosphere. Through their advanced features, reliable performance, and user-friendly design, the Aprilaire 1750A and 1770A stand out as leaders in the dehumidification market.