condair CHD-NA On-Off Digital Duct Humidistat Instruction Manual

condair CHD-NA On-Off Digital Duct Humidistat

Product Information

CHD-NA – On/Off Digital Duct Humidistat

The On/Off Digital Duct Humidistat is a Condair digital humidistat that can be configured for either humidity control or as a high limit safety device. It provides accurate control of the relative humidity (RH) in a return duct and will activate/deactivate a furnace or circulation fan. The humidistat comes with a kit number 2597935 and component number 2548732.

Installation Instructions

The following are the installation instructions for the On/Off Digital Duct Humidistat:

Duct High Limit Installation

• When installed as a high limit safety device, 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

• Install directly on the supply duct in an area where the air is well mixed with uniform flow.

Duct 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: Install on the return air duct, close to the air inlet but upstream from a return fan if one is present.

Installation

Refer to installation overview in section 2.

1. At the place of location, drill a hole with a diameter of 16 mm (5/8) as well as 4 holes for the self-tapping screws into the duct.
2. Open the screw on the housing cover and remove cover.
3. Lead connecting cable through the cable gland and connect wires to the terminals according to the wiring diagram.
4. Attach gasket to the sensor side of the housing (self-adhesive).
5. Insert the probe into the hole in the duct, then fix housing to the duct using the 4 self-tapping screws provided.
6. Snap cover into the hinge of the housing, then close cover and fix it with the screw (do not tighten screw too much).

Note: We recommend using 18-gauge wire, and maximum.

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

Kit No. /Component No. /Description

• 2597935 /2548732 /On/Off Digital Duct Humidistat

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

Mounting and 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.| 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 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.

| Location:

1. Install on the retaurn air duct, close to the air inlet but upstream from a return fan if one is present.

Installation

Refer to installation overview in section 2.

1. At the place of location drill a hole with a diameter of 16 mm (5/8”) as well as 4 holes for the self-tapping screws into the duct.
2. Open the screw on the housing cover and remove cover.
3. Lead connecting cable through the cable gland and connect wires to the terminals according to the wiring diagram.
4. Attach gasket to the sensor side of the housing (self-adhesive).
5. Insert the probe into the hole in the duct, then fix housing to the duct using the 4 self-tapping screws provided.
6. Snap cover into the hinge of the housing, then close cover and fix it with the screw (do not tighten screw too much).

Note: We recommend using 18-gauge wire, and maximum <100 ft distance from the unit.

Installation overview

Attention

1. 0V / GND
2. 24 V AC/DC ±10%
3. DO1
4. DO1
5. DO2
6. DO2
7. RT
8. RT

Duct Humidistat LCD Display

Switching the humidistat on and off

• Press the <On/Off> button to switch the humidistat on and off.

Set limit value (switching point)

Proceed as follows to set the limit value:

1. Switch on the humidistat with the <On/Off> button.
2. Set the required limit value in% rH with the - or button.

Configuration

Using keypad, set humidity setpoint to specified level (85% maximum) as a safety to prevent saturation.| Using keypad, set specified humidity level. For general health

Sensor Calibration

• Activate the controller by pressing the <On/Off> button. Press the button for 3 sec until “SEL” is shown in the large digits. The menu can be left by pressing the <On/Off> button or by not pressing a button for more than 5 minutes.
• Select “CALH” or “CALt” with the / buttons.
• Small digits show “CALH” (internal humidity sensor calibration) and “CALt” (temperature setback sensor calibration).
• The current calibration value is displayed. Press button and then change the value with / buttons and save it with the button.

Setting Parameters to Configure the Controller

The controller is preset to work for most applications. For special requirements it can be fine-tuned to work ideally with a simple parameter setup routine. The parameters can be changed on the unit without the need of additional equipment.

Identifying the firmware version

The parameters and functionality of the controller depend on its firmware version and revision. It is therefore important to use a matching product version and parameter set. The firmware version and revision version can be found when pressing simultaneously the and buttons during several seconds. On the upper 7 segment display, the firmware version can be found, on the lower 7 segment display the current revision version (or “sub-version”).

How to change the parameters

The parameters are password protected. There are two levels of parameters: User operation parameters for access control settings and expert parameters for control functions and unit setup. The passwords for user levels and expert level are different. Only control experts should be given the control parameter password.

The parameter can be changed as follows:

1. Press and buttons simultaneously for three seconds. The display will indicate the firmware version in the upper large digits and the revision in the lower small digits. Pressing the key will show: “CODE”.
2. Select a password using the and buttons. Selection “009” in order to get access to the user parameters, “241” for control parameters. Press <On/Off> button after selecting the correct password.
3. Once logged in, the parameter is displayed immediately.
4. Select the parameter with the and buttons. Change the parameter by pressing the “OPTION” button. The “MIN” and “MAX” symbols show up and indicate that the parameter may be modified now. Use and buttons to adjust the values.
5. After you are done, press <On/Off> button in order to return to the parameter selection level.
6. Press the <On/Off> button again to leave the menu. The unit returns to normal operation if no key is pressed for more than 5 minutes.

User Parameters (Password 0009)

_ Table 1: _User Parameters

0 = Switched OFF, 1 = Switched ON, 2 = state before power failure

| 0, 1, 2| 2
UP 03| Celsius or Fahrenheit, Select ON for Fahrenheit, OFF for Celsius| ON, OFF| OFF (Celsius)
UP 04| Select type of content for large digits (00= OFF): 01 = Setpoint

02 = Humidity Sensor

03 = External Temperature Sensor

| 00…03| 01

Control Parameters (Password 0241)

_ Note: _Only experts should change these settings! See user parameter for login procedure!

Table 2: Output Configuration

(Time the fan runs before control output starts)

| 00:00 – 98:30| 00:10
CP 03| Stop delay for fan [MM:SS]

(Time the fan keeps running after control output stops)

| 00:00 – 98:30| 01:30

Table 3: Temperature Setback Configuration – *For humidity control only

OFF = Temperature set back is disabled ON =Temperature setback is enabled

| ON, OFF| OFF
CP 05| Setpoint limit at full setback| 0..100 %| 20 %
CP 06| Lower temperature limit:

Outside temperature with maximum setback

The setback will be equal to the minimum setpoint limit

| -40…60°C

-40…160°F

| -30 °C (-22°F)
CP 07| Upper temperature limit:

Outside temperature at begin of setback

| -40…60°C 40…160°F| 0 °C (32°F)
CP 08| Number of seconds taken into account to calculate the average input signal Low value = fast response

High value = slow response

| 0…100| 10

Product Specification

Power Voltage| Operating voltage Power consumption Terminal connection| 24 V AC 50/60 Hz ± 10 %, 24 VDC ± 10 %

Max. 3 VA

For wires 0.34…2.5 mm2 (AWG 24…12)

---|---|---
Signal input| Measuring element Measuring range Hysteresis| Capacitive measuring element 0…100 % rH

± 1 % rH

Signal Output| Digital signal output Switching type Switching power

Admissible switching voltage

| DO1

Relay, normally open 2(1.2) A

0..250 VAC / 0…24 VDC

Environment| Operation:

Climatic Conditions Temperature Humidity

| IEC 721-3-3

Class 3 K5

0…50°C (32…122°F)

<95 % rH not condensing

General| Housing and housing cover Filter material

Weight (including packing)

| PC and ABS

PTFE coated 1µm pores 220 g (7.8 oz)

Wiring Diagrams

Wiring diagram CHD-NA for RS, EL, GS, US and SE

Wiring diagram CHD-NA for DL and ME

Wiring diagram CHD-NA with RCC-NA and APS for RS, EL, GS, US and SE

Wiring diagram CHD-NA with RCC-NA for DL and ME

For Wiring Schematic:

• Get the Condair Sensor Connect App

© Condair Group AG, Switzerland

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