CARNES HXHAS Manuel utilisateur
READ AND SAVE
THESE INSTRUCTIONS
COmmERCIAl HUmIDISTAT
OwNERS mANUAl AND
qUICk REfERENCE gUIDE
mODElS
HXHAS, HXHAST,
HXHAw, HXHAwT
FORM 16767
ISSUED: 03-10-21
2 Form 16767
Safety Cautions | COMMERCIAL HUMIDISTAT
CAUTION:
Follow all recommendations, instructions and precautions in this Installation,
Operation and Maintenance Manual to maximize performance, maintain
efficiency and to provide a safe operational environment. Do not install, use
or operate this equipment until this manual has been completely read and
understood.
Important Note:Disconnect electrical power to the furnace and humidifier
before servicing or starting installation.
Liability:
Carnes does not accept any liability for installations of humidifier
equipment installed by unqualified personnel, or the use of parts,
components, equipment, or alterations of Carnes manufactured equipment
that is not authorized or approved by Carnes.
!
COMMERCIAL HUMIDISTAT | Table of Contents
Form 16767 3
Models HXHAS, HXHAST, HXHAW, HXHAWT ......................................... 0
Caution........................................................................................................ 2
Packing List................................................................................................. 4
Humidistat Function .................................................................................... 5
Complete Installation .................................................................................. 6
Duct Installation.................................................................................... 6
Wall Mount Installation ......................................................................... 7
Outdoor Temperature Sensor .............................................................. 8
Location Outdoors.......................................................................... 9
Location in Outdoor Air Intake ..................................................... 10
Wiring ................................................................................................. 11
Power Connection Wiring (R, C) ................................................. 12
Outdoor Temperature Sensor Wiring (ODT) ............................... 12
Humidifier Control Wiring (H1+)................................................... 12
Modes of Operation .................................................................................. 13
Humidistat Demand Mode.................................................................. 14
High Limit Humidistat ......................................................................... 15
Humidity Sensor ................................................................................. 15
Operation .................................................................................................. 16
Screen and Menu............................................................................... 16
Home Screen ............................................................................... 16
Settings Page............................................................................... 17
Setpoint Adjustment Page ........................................................... 17
Units Option .............................................................................................. 18
Packing List | COMMERCIAL HUMIDISTAT
4 Form 16767
Verify all components were included in the humidistat packaging.
BC
Figure 1: Humidistat Package Components
HXHAW A. Humidistat
E. Drywall Anchors and Screws (2 each)
HXHAWT A. Humidistat
C. Outdoor Air Temperature Sensor
E. Drywall Anchors and Screws (2 each)
HXHAS A. Humidistat
B. Duct Sensor
D. Sheet Metal Screws (3)
E. Drywall Anchors and Screws (2 each)
HXHAST A. Humidistat
B. Duct Sensor
C. Outdoor Air Temperature Sensor
D. Sheet Metal Screws (3)
E. Drywall Anchors and Screws (2 each)
A
COMMERCIAL HUMIDISTAT | Installation
Form 16767 5
Humidistat Function
A humidistat is a device that measures relative humidity and works with
an external controller or humidier to automatically control the humidier to
maintain a desired humidity level throughout the conditioned space.
The Carnes commercial humidistats are capable of controlling a humidier by
ON/OFF or modulating 0-10 VDC control signals. The commercial humidistat
package offers 2 types of installation and multiple modes of operation to t
any humidication need. The two types of installations are wall-mounted
and duct-mounted and are offered in differing packages upon ordering. The
multiple modes of operation are the industry standard humidistat demand
output, the high limit demand output, and the humidity sensor output.
Each type of the commercial humidistat will be shipped with different
defaults, all listed below…
Humidistat Version Output (Default) Mode (Default)
HXHAS Modulating 0-10 VDC Common Demand Signal
HXHAST Modulating 0-10 VDC Common Demand Signal
HXHAW Modulating 0-10 VDC High Limit Demand Signal
HXHAWT Modulating 0-10 VDC High Limit Demand Signal
Duct Mounted Installation
1. Choose a location in the duct that
is downstream of the humidier
steam distribution unit. Make sure
the humidistat mounting location is
close enough to plug in the sensor.
Install the sensor a minimum
of 6” ahead of or a minimum
15” after a change in air ow
direction or obstruction in the
duct. Do not install duct sensor
near outdoor air intake.
2. Drill a 1/2” holes in the duct to
place the sensor. Use a sheet
metal screw (D) to attach the sen-
sor to the duct. Arrows in the duct
mount sensor indicate the direction the air ow should pass over the
sensor for optimal measurements.
3. Mount the humidistat display to a wall or duct in a convenient
location that allows easy adjustment to the settings. To mount the
humidistat, remove the back plate and install with screws (D or E)
through the mounting holes.
4. CAUTION: do not plug or un-plug the duct sensor with power
applied to the humidistat, the humidity sensor will break. Plug the
duct sensor into the humidistat. Pay close attention to the orienta-
tion of the plug or permanent damage will occur to the sensor. See
Figure 3 for proper orientation of the duct sensor plug. Place the
hook of the red plug up and away from the humidistat display board
and push onto the white connector located in the bottom left corner
of the humidistat display board. The wire colors also market on the
circuit board and match the correct orientation of the plug wires.
CAUTION: Turn off power before plugging or un-plugging duct
sensor. Do not plug or un-plug the duct sensor with power applied to the
humidistat, the sensor will break.
Installation | COMMERCIAL HUMIDISTAT
6 Form 16767
Air Flow
Figure 2: Duct Sensor
COMMERCIAL HUMIDISTAT | Installation
Form 16767 7
Figure 3: Duct Sensor Connection
Hook Up Away From
Circuit Board
Wire Colors
Wall Mount Installation
1. Select a location in the space that requires humidity control. Typically,
the humidistat will be placed in a location with reasonable air ow for
accurate environmental measurements.
2. The humidistat should be placed in an area of sufcient air movement
and out of the way of any other temperature or humidity affects. For
example, do not place the humidistat in direct sunlight, near windows,
or near an air register.
3. Once the location is selected, attach the humidistat back cover to the
wall using 2 screws/anchors (E).
Note: The duct sensor is not needed for this installation option.
Installation | COMMERCIAL HUMIDISTAT
8 Form 16767
Outdoor Air
Temperature (°F)
Outdoor Air
Temperature (°C)
Adjusted Maximum
Humidity Setpoint
(RH%)
-30 -34.4 10
-20 -28.9 15
-10 -23.3 20
0 -17.8 25
10 -12.2 30
20 -6.7 35
30 -1.1 40
40 4.4 45
45 7.2 47.5
>45 >7.2 Unadjusted
Table 1: Maximum setpoint based on outdoor air temperature
Outdoor Air Temperature Sensor Installation
When outdoor air temperature is very low, condensation can occur on
windows and other surfaces which may cause damage to the structure. To
minimize this risk, the outdoor air temperature sensor should be installed.
The outdoor air temperature lowers the humidity setpoint to a safe level,
where the indoor relative humidity is too low to condense. The outdoor
temperature compensation control adjusts the maximum humidity setpoint
according to the values shown in Table 1. The humidistat will automatically
detect if the outdoor air temperature sensor is connected and control the
relative humidity setpoint accordingly.
COMMERCIAL HUMIDISTAT | Installation
Form 16767 9
CAUTION: electrical interference can cause erratic system operation.
• Do not route temperature sensor wiring with building power wiring,
next to control contactors, near light dimming circuits, or electric
motors.
• Use shielded cable to reduce interference when rerouting is not
possible.
• Be sure wires have a cable separate from the humidistat cable.
• See Figure 5 for wiring diagram.
Exterior Wall Installation
To mount the Outdoor Temperature Sensor outdoors the signal wire will
need to penetrate an exterior wall. Use the following guidelines for proper
operation of the sensor:
Mount the sensor where:
• there is good air circulation
• wire distance between sensor and humidistat is less than 200 feet
• it can measure true outdoor ambient air temperature
• it is above the expected snow line
Do NOT mount the sensor:
• in direct sun
• where it may be covered by debris, snow, or ice
Installation | COMMERCIAL HUMIDISTAT
10 Form 16767
Figure 4: Outdoor Temperature Sensor in Furnace Intake Pipe
Connect to
Humidistat
(ODT)
Drill Hole in
Pipe & Seal OAT (Outdoor
Air Temperature)
Sensor
2” min.
INSIDE OUTSIDE
Furnace
Fresh Air
Intake
Outdoor Air Intake Duct Installation
Mount the sensor in an outdoor air intake by drilling a ¼ inch hole within 8
inches of outside. Angle the hole towards the outside. Insert the temperature
sensor into the intake pipe until the sensor is at least 2 inches outside the
structure in the intake pipe. Seal the hole and secure the wire so it cannot
be accidentally pulled out.
Ce manuel convient aux modèles suivants
3
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