Aprilaire 76 Installation Manual

Model 76 Dehumidifier Control

Installation Instructions

READ AND SAVE THESE INSTRUCTIONS

The Model 76 is for use with any dehumidifier as an EXTERNAL CONTROL,

including Aprilaire Models 1830, 1850 Series, and 1870 Series.

The Model 76 can also be used as a communicating REMOTE CONTROL

with all Aprilaire Models 1830, 1850 Series, and 1870 Series.

(See OVERVIEW on page 3 for details.)

SAFETY INSTRUCTIONS

WARNING

1. Improper installation may cause property damage or injury. Installation, service, and

maintenance must be performed by a qualiﬁed service technician.

2. 120 Volts may cause serious injury from electric shock. Disconnect electrical power before starting installation or servicing. Leave power disconnected until installation/service is completed. This control is not a 120 Volt (line voltage) device.

CAUTION

1. Read all instructions before beginning installation.

2. Do not use in pool applications. Pool chemicals can damage the control.

3. Do not use solvents or cleaners on or near the display and circuit board. Chemicals can

damage components.

TABLE OF CONTENTS

OVERVIEW

SAFETY INSTRUCTIONS ..................................................................1

OVERVIEW ..............................................................................3

SPECIFICATIONS .........................................................................3

LOCATION RECOMMENDATIONS ..........................................................4

INSTALLATION

Mount Control..........................................................................5

Wiring

External Control .....................................................................7

Remote Control......................................................................9

SYSTEM CHECKOUT

Power Up..............................................................................11

Test Mode ............................................................................13

Humidity/Dryness Level Setting.........................................................13

Offset ................................................................................13

Turning On and Setting the Control .....................................................14

Sequence of Operation

External Control ....................................................................15

Remote Control.....................................................................15

TROUBLESHOOTING Error Codes

External Control ....................................................................16

Remote Control.....................................................................16

Table 2 – Error Codes ..................................................................17

Table 3 – Troubleshooting Guide ........................................................19

The Aprilaire® Model 76 Dehumidifier Control provides control of the dehumidifier from the living space.

The control can be installed as an EXTERNAL CONTROL, allowing the homeowner to set and adjust the humidity setting and turn dehumidification on or off from a convenient location. In this application, the Model 76 uses an onboard sensor to monitor the relative humidity (%RH) in the space in which it is located and displays the measured relative humidity on the digital display.

The control can also be installed to function as a REMOTE CONTROL if the dehumidifier is located where it is not easy or convenient to access. The control can be installed in any location within the living space, with the dehumidifier installed in the area to be dehumidified, such as a crawl space, sealed attic, or basement. The dryness level is set on the control and communicated to the dehumidifier. The dehumidifier communicates the measured relative humidity in the space being dehumidified back to the Model 76 Control where it is displayed on the digital display.

SPECIFICATIONS

ELECTRICAL External Remote

Voltage: 24VAC +/-20%

Input Voltage and Current

Output Dry Contact, Normally Open Communication

CONTROL External Remote

Control Range 40% – 80% RH

Current: 25mA (nominal), 50mA (max.) at 24VAC

Voltage: 9VDC (supplied by dehumidifier control board)

1 (less dry) – 7 (more dry) 65°F – 42°F Dew Point

Accuracy +/-5% RH

See Dehumidifier Specifications

Differential 3%

Low Limit 40°F Dew Point 50°F Dry Bulb

High Limit 99°F Dry Bulb 105°F Dry Bulb

LOCATION RECOMMENDATIONS

BACK PLATE

ANCHOR

INSTALLATION

As a REMOTE CONTROL, the Model 76 can be mounted wherever is convenient for the homeowner.

Follow the recommendations below when installing the Model 76 as an EXTERNAL CONTROL.

MOUNT CONTROL

• In an area the homeowner wants to monitor and control moisture levels.

• On an interior wall.

• Approximately 5 feet off the floor.

• At least 18" from an outside wall.

DO NOT MOUNT CONTROL

• In the flow of a supply register.

• Behind doors, in corners or other dead air spaces.

• In direct sunlight, near lighting fixtures, or other appliances that give off heat.

• On an outside or unconditioned area wall.

• In stairwells or near outside doors.

• On a wall with concealed pipes or ductwork.

MOUNT CONTROL

FIGURE 2 – DISASSEMBLE CONTROL

PULL APART

FRONT COVER

90-2486

FIGURE 1 – MOUNTING LOCATION

18"

MINIMUM

FEET

FIGURE 3 – MOUNT BACK PLATE

NONO

BACK PLATE

90-1640

SCREW

90-2485

REQUIRED COMPONENTS

NO/NC SWITCH

MODEL 76 CONTROL

• 18-24 gauge wire (field supplied) – 4 wires required, run new cable as needed.

• (2) #8 x 1-1/2" mounting screws (supplied)

• (2) Anchors (supplied)

1. Level the back plate on the wall and mark the mounting holes and wire access location on the wall.

2. Drill two 3/16" mounting holes and a 3/4" wire access hole. See FIGURE 3.

3. Install the drywall anchors flush with the wall surface. Note: Mounting holes on the back plate

are designed to fit on a horizontal J-box.

4. Run a 4-wire cable from the dehumidifier to the wall mount location and through the square hole in the back plate.

5. Secure the back plate to the wall using the two #8 x 1-1/2" screws.

WIRING

WIRING MODEL 76 EXTERNAL CONTROL TO 1830 / 1850 SERIES / 1870 SERIES

1. Disconnect power to the

dehumidifier and HVAC system.

2. Remove the wiring access cover next to the control on the dehumidifier. See FIGURE 4.

3. Wire the Model 76 to the dehumidifier as shown in FIGURE 5.

4. Ensure the NO/NC switch on the dehumidifier control is set to NO (see FIGURE 5).

FIGURE 4 – WIRING ACCESS COVER LOCATION

CONTROL

PANEL COVER

WIRING ACCESS COVER

90-1884

FILTER ACCESS DOOR

FIGURE 5 – WIRING MODEL 76 EXTERNAL CONTROL TO 1830 / 1850 SERIES / 1870 SERIES

NC NO

B C/R/+ DH DH

+ - A B ODT

DH DH

FLO AT

Switch

VENT DEH

SensorRemote

Dampers

Gh Rf Cf Gs YW

HVAC EQUIP.

90-2489

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