Carnes HXHAN Installation Manual

COPYRIGHT © 2013 CARNES COMPANY

ALL RIGHTS RESERVED

SUPERSEDES 16745-A

16745-B, page 1

FUNCTIONALITY

The HXHAN is a flexible humidistat that can be adjusted to fit a customer’s needs. A pushbutton encoder and a set
of switches are available to adjust the humidistat’s alternate functions.

2-1/4”

(57mm)

5-3/4”

(146mm)

4-1/2”

(114mm)

2-13/16”
(71mm)

1-1/4” (32mm)

INTRODUCTION

The Model HXHAN is an intelligent humidistat solution used exclusively for duct mounted installations. The humidi­stat is capable of providing both humidity and temperature measurements from inside the duct. The microprocessor
control takes the temperature into consideration when calculating the humidity to provide an extra degree of
precision.

Setpoint Adjustment

The setpoint adjustment encoder modifies the setpoint of the HXHAN. A push on the
encoder knob activates a switch, bringing the humidistat into setpoint adjustment mode.
The seven segment LED displays show the current humidity setpoint the humidistat is
operating. The humidity setpoint can be modified by turning the knob clockwise (to
increase the humidity setpoint) or counter clockwise (to decrease the humidity setpoint).
Once the desired humidity setpoint is obtained, the knob is pressed again to confirm the
desired setpoint and return to the humidity/temperature viewing mode. While in the
setpoint adjustment mode, the setpoint adjustment LED is lit. If the knob is inactive in
setpoint adjustment mode for more than a minute, the humidistat automatically confirms
the current humidity setpoint indicated on the seven segment LED’s and returns to the
humidity/temperature viewing mode.

READ AND SAVE THESE INSTRUCTIONS

MODEL HXHAN

DUCT HUMIDISTAT, PROPORTIONAL CONTROL — CONTROL OR HIGH LIMIT

INSTALLATION AND

SPECIFICATION

CARNES COMPANY 448 S. Main St., P. O. Box 930040, Verona, WI 53593-0040 Phone: [phone] Fax: [phone] www.carnes.com

1-1/4”

(32mm)

INSTALLATION

Remove any excess insulation from the duct that would
prevent the probe from extending a minimum of 4” (106mm)
into the air stream.

Make a 1-1/2” (38mm) hole in the duct for inserting the
probe.

Use a gasket, sealer, or other means to seal the area
between the unit and the duct to ensure proper operation.

Snap-on
plastic
cover

Aluminum housing

DUCT

Allen screws

Use Allen wrench
to unlock cover (1/16”)

16745-B, page 2

The first (farthest left) adjustable switch controls
whether the unit is in proportional control mode or on/off
control mode. When the switch is off, the unit is in
proportional mode. When it is on, the unit is in on/off mode.
In on/off mode, the output voltage signal is either 0 or 10
Volts. This limits the humidifier to either run at full capacity
when there is a humidity demand, or turn off when there is
no demand. In proportional mode, the output signal to the
humidifier varies between 0-10 Volts, this mode has the
benefit of being able to adjust the unit to operate at a
percentage of its full capacity. Proportional mode allows the
humidifier to regulate at a more precise humidity level
(between 1-2% from setpoint), whereas the on/off mode
has a wider regulatory band but can have some added
operational benefits, including decreased energy
consumption.

The second (middle) adjustable switch controls whether or
not to halt operation of the humidifier when sensing a tem­perature error. If the switch is off, the humidistat will shut
down the humidity demand signal if the sensor senses a
temperature inside the duct of less than 50 degrees
Fahrenheit. If the switch is on, the humidistat will continue
to operate normally regardless of the temperature inside the
duct. At temperatures less than 50 degrees, the possibility
of condensation accumulating on the inside of the duct work
increases significantly.

The third (farthest right) adjustable switch controls whether
the two seven segment LED displays humidity or tempera­ture when not in setpoint adjustment mode. If the switch is
on, the unit displays temperature (in Fahrenheit). If the
switch is off, the unit displays humidity (in % RH). If the
switch is on, and the temperature being sensed is 100
degrees or greater, any digits beyond the 1’s and 10’s digit
will not be displayed.

On/Off or Proportional Control

Enable or Disable Temperature Error

Humidity or Temperature Display

Self tapping metal
screws or facsimile