Aprilaire 1750A, 1770A installation instructions Third-party control, External

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third-party control

An external thermostat with dehumidifier connections can be used as an ON/OFF dehumidifier control.. In this configuration, the third-party control initiates dehumidification and overrides the on-board dehumidifier control logic.. The dehumidifier control knob can only be used to initiate Test Mode when a third-party control is used.. The Convertible configuration is not available with a third-party control..

WIRING & DIP SWITCH CONFIGURATION

Figure 27 – Third-Party Control Wiring

 

 

 

DEHUMIDIFIER

 

 

CONTROL BOARD

 

 

T

 

 

DAMPERS

 

 

VEN

THIRD-PARTY CONTROL

 

DEH

THERMOSTAT

HVAC EQUIPMENT

P

 

 

R

R

Rf

C

C

Cf

EQUIHVAC

G

 

 

Gs

 

G

Gh

W

W

W

Y

Y

DH

Deh

 

R

 

 

Deh

 

FLOAT

 

 

 

 

SWITCH

 

 

ODT

 

 

ESENSO

 

 

OT

NOTE: Deh output(s) must

A

REM

be normally open.

B

+

 

 

 

 

-

90-1537

 

 

Figure 28 – Third-Party DIP Switch Configuration

SYSTEM SETUP

LOCAL

1

 

 

 

ON

EXTERNAL

 

 

 

HVAC FAN OFF

2

 

 

 

HVAC FAN ON

 

 

 

 

WHL HOUSE

3

 

 

 

 

CONVERTIBLE

 

 

 

 

 

 

 

 

VENT-AUTO

4

 

 

 

 

VENT-TIMED

 

 

 

 

90-1538

Wiring Notes:

The dehumidifier Rf and Cf terminals must be powered from the transformer that powers the third-party control..

Third-Party Control with 2 Dehumidifier Connections

1.Connect one thermostat dehumidifier terminal to the Rf terminal on the dehumidifier control board..

2.Connect the other thermostat dehumidifier terminal to the DH terminal on the dehumidifier control board..

Third-Party Control with 1 Dehumidifier Connection

Connect the thermostat dehumidifier terminal to the DH terminal on the dehumidifier control board..

SEQUENCE OF OPERATION

When the third-party control makes a dehumidification call, the dehumidifier damper output turns on, the dehumidifier blower turns on, and the green Status LED flashes..

After 3 seconds the compressor turns on and the green Status LED switches to solid illumination.

When the third-party control ends a dehumidification call, the dehumidifier damper output turns off and the dehumidifier blower and compressor turn off along with the green Status LED..

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Contents Table of Contents Safety InstructionsWhole-Home, see Spot, see Convertible, see OverviewUnpacking and Contents SpecificationsPower Outlet within 8 ft.. of unit Install Unit Indoors Do not expose to elementsLocation Considerations Location NotesDuct Collars & Backflow Damper Mechanical InstallationDuctwork Recommendations Design AirflowsDrain Mechanical InstallationWhole-Home installation Attic Installation Note Basement Ducting & WiringAttic Ducting & Wiring DIP Switch Configuration Spot installationSequence of Operation Duct Work Grilles with 8 duct collarsWiring Notes Ducting & WiringOptional Component Convertible installationCondensate Pan & Normally Closed Float Switch OFF Test Ventilation oR Air Cycling Determine Cycle Time Determine Fresh AIR Delivery RateCFM Delivered Outdoor Temperature Sensor Installation Switch NotesVent-Auto Vent-Timed, Hvac Initiates VentilationVent-Timed, Dehumidifier Initiates Ventilation Model 70 living space control Wiring & DIP Switch ConfigurationLocal Whole-HomeExternal Third-party controlSystem Checkout Adjusting Dehumidifier SET PointDehumidification VentilationLED Codes TroubleshootingGreen LED Codes Red LED CodesTroubleshooting Guide Troubleshooting
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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.