Carnes HXHAMT Installation Manual

COPYRIGHT © 2013 CARNES COMPANY

ALL RIGHTS RESERVED

SUPERSEDES 16746-B

16746-C, page 1

The Model HXHAM is a wall-mounted, microprocessor-controlled humidistat solution for cutting edge humidity
control. The HXHAM employs a backlit LCD module, which displays both the ambient temperature and humidity of
the surrounding air. The embedded software allows user navigation between temperature/humidity viewing mode
and setpoint adjustment mode, and also outdoor temperature and humidity viewing mode*. The user can enable
supported humidistat functions using four onboard switches, and an onboard pushbutton encoder is used to modify
the setpoint and toggle between different viewing modes.

* - when temperature compensation mode is enabled and an optional temperature compensation kit is purchased.

Pressing the pushbutton encoder inwards toggles the
viewing mode to setpoint adjustment (shown above). In
this mode, the setpoint adjustment encoder is used to
modify the setpoint of the HXHAM. The LCD display
shows the current humidity setpoint the humidistat is
operating. The humidity setpoint is modified by turning
the knob clockwise (increasing the humidity setpoint) or
counter clockwise (decreasing the humidity setpoint).
When the desired humidity setpoint is obtained, press
the knob again to confirm the setpoint and return to the
humidistat to the humidity/temperature viewing mode. 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 LCD
and returns to the humidity/temperature viewing mode.

FUNCTIONALITY
Temperature and Humidity Viewing Mode

READ AND SAVE THESE INSTRUCTIONS

MODEL HXHAM, HXHAMT

WALL HUMIDISTAT, PROPORTIONAL CONTROL

INSTALLATION AND

SPECIFICATION

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

INTRODUCTION

The temperature/humidity viewing mode (shown above)
displays the temperature and humidity of the surround­ing air, along with a “T” symbol on the far right hand side
indicating the humidistat is calling for demand. This is the
home screen and is shown during normal operation.

Setpoint Adjustment Viewing Mode

16746-C, page 2

Pressing the pushbutton encoder again will bring the
humidistat mode into setpoint adjustment. Similar to opera­tion without an external sensor, the LCD displays the cur­rent humidity setpoint the humidistat is operating. However,
with temperature compensation enabled, if the humidistat is
overriding and automatically adjusting the operating set­point, both the user setpoint and the operating setpoint will
be displayed (shown above). Here, the user setpoint can
still be adjusted normally. If the user setpoint is adjusted
less than or equal to the operating setpoint, the user set­point and the operating setpoint will be the same and only
the user setpoint will be displayed. If the humidistat is left in
setpoint adjustment mode for more than a minute without
activity, the humidistat will automatically return to the home
temperature/humidity viewing mode.

If a temperature compensation kit is purchased with the
humidistat, and temperature compensation is enabled by
turning the fourth function switch high (on), pressing the
pushbutton encoder inwards from the home
temperature/humidity screen brings you to the outdoor sen­sor temperature/humidity screen (shown above). From this
screen, the temperature and humidity of the surrounding air
of the attached sensor is shown. This is very similar to the
previous temperature/humidity home screen, except the
demand “T” symbol is replaced by an “*”, indicating the
temperature being displayed is from the outdoor sensor.

If the temperature sensed on the external sensor is below a
certain threshold, the humidistat will automatically adjust
the operating setpoint if it senses that the outdoor tempera­ture is low enough to cause condensation problems on
windows and siding.

The fourth (farthest right) function switch enables or dis­ables the temperature compensation option available with
the HXHAMT external sensor. A high (on) switch enables
temperature compensation while a low (off) switch disables
it. If temperature compensation is enabled without an
attached sensor, the operating setpoint will be limited to
15% Relative Humidity, and temperature compensation
screen will indicate “No Sensor”. More on this ability is
explained below.

The second (middle) adjustable switch controls whether the
unit displays its temperature reading in Celsius or
Fahrenheit. If the switch is high (on), the humidistat will
display Celsius. If it is low (off), the humidistat will display
Fahrenheit.

Fahrenheit or Celsius Temperature Display

Enabling Temperature Compensation

HXHAMT (Temperature Compensation Option)

The first (farthest left) adjustable switch controls whether
the unit is in proportional control mode or on/off control
mode. When the switch is down, the unit is in proportional
mode. When it is up, 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.

On/Off or Proportional Control