SYSTEM CHECKOUT

DEHUMIDIFICATION

1.Check the wiring to the HVAC equipment and any accessories if applicable..

2.Plug unit in and turn on/off switch to ON..

3.Rotate the main control knob clockwise to the TEST position..

4.If set up correctly, the dehumidifier blower will turn on and the dehumidifier damper output will turn on.. After 30 seconds the dehumidifier compressor will turn on.. The blower and compressor will remain on for 1 minute in TEST mode.. After 1 minute has elapsed, the dehumidifier blower and compressor will turn off and the dehumidifier damper output will turn off.. NOTE: If the minimum off time for the compressor has not expired when the test mode is initiated, the compressor will not turn on until the minimum off time has been met.. If the blower or compressor fails to turn on, refer to the Troubleshooting Guide..

5.The Status LED will blink red and green alternately if the control knob has been left in TEST after the compressor has turned off..

Figure 29 – Control Knob Setpoint

90-1327

ADJUSTING DEHUMIDIFIER SET POINT

1.Use the control knob on the unit to set the desired dryness level..

Based on indoor temperature, use Table 6 to determine the control knob setting to achieve the desired humidity level..

For most installations, start with a setting in the NORMAL range. See Figure 29..

Moving the knob clockwise towards MORE will increase dehumidifier run time, allowing for lower humidity levels.

Moving the knob counterclockwise towards LESS will decrease dehumidifier run time, allowing for higher humidity levels.

2.Reference Model 70 Living Space Control or Third-Party Control’s Installation Instructions for start-up with a separate control.. Note: There is a 6 minute delay after power up when using a Model 70..

TABLE 6 – %RH (± 5%) Based on Control Knob Setting & Indoor Temperature

Control Knob Setting

 

Indoor Temperature

 

 

 

 

 

 

& Dew Point

65°F

70°F

75°F

80°F

 

 

 

 

 

 

 

 

1

– Less, 65°F DP

 

84%

71%

60%

 

 

 

 

 

 

2

– 60°F DP

86%

73%

61%

52%

 

 

 

 

 

 

3

– Normal, 56°F DP

74%

63%

53%

45%

 

 

 

 

 

 

4

– Normal, 52°F DP

64%

54%

45%

39%

 

 

 

 

 

 

5

– Normal, 48°F DP

55%

46%

39%

33%

 

 

 

 

 

 

6

– 44°F DP

47%

39%

33%

28%

 

 

 

 

 

 

7

– More, 40°F DP

40%

34%

28%

24%

 

 

 

 

 

 

VENTILATION

EXAMPLE: At an indoor temperature of 75°F and a control knob setting of 3 (56°F DP), the dehumidifier will work to achieve a 53% humidity level..

The %RH values are ± 5% and are to be used as a GUIDE ONLY for initial set-up..

Indoor temperature is measured at the inlet to the dehumidifier..

1.Verify 24 VAC is applied in series with the normally-closed damper and connected to the VENT DAMPER terminals on the dehumidifier control board..

2.Remove the control door and rotate the CYCLE TIME potentiometer clockwise to the TEST position.

See Figure 30..

3.If set up properly, the HVAC blower will turn on and the ventilation damper will open.. The HVAC blower will remain on and the ventilation damper will remain open for 1 minute or until the dial is turned from the TEST position.. DO NOT leave CYCLE TIME set to TEST. If the HVAC blower fails to turn on or the damper fails to open, refer to the Troubleshooting Guide..

Figure 30 – Ventilation Test

VENTILATION TEST

30

MIN.

060

MIN MIN.

OFF TEST

CYCLE TIME

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Aprilaire 1770A, 1750A System Checkout, Dehumidification, Adjusting Dehumidifier SET Point, Ventilation

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.