Nortec On Digital Duct Humidistat User Manual download pdf

2549737-D | 22 July 2014 Introduction | 1

1 - Duct High Limit Installation

When installed as a high limit, the humidistat prevents over humidification as

well as wetting of the supply duct. Do not use fan relay when configuring as a

high limit.

Location:

1 Install directly on the supply duct in an area where the air is well mixed with

uniform flow.

2 Install downstream of the steam distributor at a distance 1.5 times the

absorption distance (typically 10-12 feet or 3-3.7 m). Must be in a location to

sense high humidity in addition to sensing when representative air is over

humidified or approaching saturation.

Installation:

1 Use the provided humidistat template and small level to mark outline of

humidistat body and location of probe hole. Ensure template is level before

marking.

2 Open the housing by removing the screw securing the face of the housing.

3 Drill a 5/8” (16 mm) hole in the duct at the marked location for probe

insertion.

4 Insert the probe into the air stream and place humidistat against duct wall.

5 Secure the duct humidistat to the duct using 4 sheet-metal screws (#6 x 3/4”

Phillips).

6 Wire as per wiring diagram 2548733 in this document.

7 Close the cover and secure using the screw removed in step 2.

Configuration:

1 Using keypad, set humidity to specified level (85% maximum) as a safety to

prevent saturation.

On/Off Digital Duct Humidistat Installation Instructions

This document covers the operation and installation instructions for the following digital humidistat:

Part #: 2548732

Description: On/Off Duct Humidistat

The humidistat can be configured for either humidity control or as a high limit safety device:

76 (3.0)

47 (1.9)

91 (3.6)

68 (2.7)

Humidify Relay

24 Vac

Com

Fan (Furnace)Relay

NTC Sensor

Figure 2: Dimensions

Figure 3: Terminal Strip

Figure 1: Duct Humidistat Installation Locations

2 - Humidity Control Installation

When configured as a humidity controller, the humidistat provides

accurate control of the RH in a return duct and will activate/deactivate

a furnace or circulation fan.

Location:

1 Install on the return air duct, close to the air inlet but upstream from

a return fan if one is present.

Installation:

1 Use the provided humidistat template and small level to mark outline

of humidistat body and location of probe hole. Ensure template is

level before marking.

2 Open the housing by removing the screw securing the face of the

housing.

3 Drill a 5/8” (16 mm) hole in the duct at the marked location for

probe insertion.

4 Insert the probe into the air stream and place humidistat against

duct wall.

5 Secure the duct humidistat to the duct using 4 sheet-metal screws

(#6 x 3/4” Phillips).

6 Wire as per wiring diagram 2548733 in this document. Figure 3

outlines the terminal layout.

7 Close the cover and secure using the screw removed in step 2.

Configuration:

1 Using keypad, set specified humidity level. 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).

1 2 3 4

Summary of Contents

Page 1 - NTC Sensor

2549737-D | 22 July 2014 Introduction | 1 1 - Duct High Limit Installation When installed as a high limit, t

Page 2

2 | Introduction Duct Humidistat LCD Display 45.5%35.0%1234675 Legend: 1 Display of current humidity value. 2 Display of setpoint 3 Snowflake

Page 3 - Power Failure

2549737-D | 22 July 2014 Introduction | 3 Table 4: Technical Specification Power Supply Operating Voltage 24 V

Nortec On Digital Duct Humidistat User Manual

Browse online or download User Manual for Equipment Nortec On Digital Duct Humidistat. Nortec On Digital Duct Humidistat User Manual

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Nortec On Digital Duct Humidistat User Manual

Browse online or download User Manual for Equipment Nortec On Digital Duct Humidistat. Nortec On Digital Duct Humidistat User Manual

Summary of Contents

Related models: Off Digital Duct Humidistat

Comments to this Manuals

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