Nortec 2548731 Installation Instructions

On/Off Digital Wall Humidistat Installation Instructions
This document covers the operation and installation instructions for the following digital humidistat:
Part #: 2548731
Description: ON/OFF Wall Humidistat

1 - Wall Humidity Control Installation

Location:
1 Do not install humidistat on an outside wall, near a heat source and/or in direct sunlight.
2 Install the humidistat on a surface that is flat and clean.
3 Install a vapor barrier to prevent sensor from interacting with inner wall draft.
4 Use a sealed, single gang electrical mounting box (recessed in the wall) to mount the humidity sensor.

Installation:

1 Pull cables 6" (15 cm) out of the wall.
2 Remove front face with digital display by loosening plastic retaining screw at the bottom. The front face
will unhinge from the top of the retaining clips.
3 Connect the control wires to the terminals according to wiring diagram 2548733 in this document. Figure
2 outlines the terminal layout.
4 Secure the metal bracket to the mounting electrical box using 2 screws (#6 x 3/4" Phillips). Make sure the
heads do not stand out more than 1/5" (5 mm) from mounting surface.
5 Remount front face on metal bracket. Ensure clips engage the grooves on top of the bracket. Gently
tighten bottom plastic retaining screw.

Configuration:

1 Using keypad, set specified humidity. For general health and comfort, a humidity setting of 50% is
recommended.
2 See Table 3 for outdoor temperature setback configuration, if optional outdoor temperature sensor is
supplied (P/N 2520263 or 2553858).
Fan (Furnace) Relay
NTC Sensor
2549736-D | 22 July 2014
Figure 1: Wall Humidistat Installation Locations
8 7 6 5 4 3 2 1
Figure 2: Terminal Strip
Humidify Relay
24 Vac
Com
73 (2.9")
15
32 (1.2")
(.6")
Figure 3: Dimensions
Introduction | 1