CARNES HXHAF User manual

READ AND SAVE
THESE INSTRUCTIONS
RESIDENTIAL HUMIDISTAT
OWNERS MANUAL AND
QUICK REFERENCE GUIDE
MODEL HXHAF
FORM 16763
ISSUED: 07-31-20

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.
2 Form 16763
Safety Cautions | RESIDENTIAL HUMIDISTAT
!

RESIDENTIAL HUMIDISTAT | Table of Contents
Form 16763 3
Model HXHAF............................................................................................. 0
Caution........................................................................................................ 2
Packing List................................................................................................. 4
Humidistat Function .................................................................................... 4
Complete Installation .................................................................................. 5
Duct Installation.................................................................................... 5
Wall Mount Installation ......................................................................... 7
Outdoor Temperature Sensor .............................................................. 7
Location Outdoors.......................................................................... 8
Location in Outdoor Air Intake ....................................................... 9
Wiring ................................................................................................. 10
Power Connection Wiring (R, C) ................................................. 10
Outdoor Temperature Sensor Wiring (ODT) ............................... 10
Heat Signal Wiring (W) ................................................................ 10
Automatic External Fan Control Wiring (G, GF) .......................... 10
Humidifier Control Wiring (H1+, H2-)........................................... 10
Wiring Notes/Cautions ................................................................. 11
Operation .................................................................................................. 12
Screen and Menu............................................................................... 12
Home Screen ............................................................................... 12
Fan/Heat Signal Indicators .......................................................... 13
Menu ............................................................................................ 14
Setpoint Adjustment Page ........................................................... 15
Mode Selection Page................................................................... 15
Modes of Operation .................................................................................. 16
General Function................................................................................ 17
Heat-Only Mode ................................................................................. 17
Basic Mode (fan wiring required for this mode - G, GF).................... 17
Eco Mode (fan wiring required for this mode - G, GF........................ 17
Performance Mode (fan wiring required for this mode - G, GF) ........ 17
Factory Default ................................................................................... 18
1-Wire Control........................................................................................... 18

Packing List | RESIDENTIAL HUMIDISTAT
4 Form 16763
Humidistat Function
A humidistat is a device that measures relative humidity and works with a
home’s heating and cooling system to automatically control a humidier to
maintain a desired humidity level throughout the home.
The CARNES HXHAF residential humidistat is capable of controlling a
humidier by ON/OFF or modulating 0-10 VDC control signals. The humidistat
offers four modes of operation to t any humidication need. The four modes
include Performance, Eco, Basic and Heat-Only Mode.
The humidistat is preset to Heat-Only Mode and ON/OFF control. These
settings are the basic setup for most homes and no adjustment is needed to
function with your Carnes humidier out of the box.
In winter climates it is highly recommended to install the provided
outdoor air temperature sensor. This minimizes condensation on
windows and in the structure when temperatures are cold. If the sensor is
not installed in winter climates the user will be required to manually adjust
the humidistat setpoint based on Table 1 or risk damage due to excess
humidity and condensation.
Verify all components were included
in the humidistat packaging.
A. Humidistat
B. Duct Sensor
C. Outdoor Air Temperature Sensor
D. Sheet Metal Screws (3)
E. Drywall Anchors and Screws (2 each)
A
BC
Humidistat Package Components

RESIDENTIAL HUMIDISTAT | Installation
Form 16763 5
Humidistat Option 1 — Return Duct
1. Choose a location on the return air
duct to mount the duct sensor. See
Figure 2 for location options. Make
sure the humidistat mounting
location is close enough to plug in
the sensor. Install the sensor a
minimum 6 inches ahead of or a
minimum 15 inches after a
 change in airow direction or
obstruction in the duct. Do not
install duct sensor near outdoor
air intake.
2. Drill a ½ inch hole in the duct to
place the sensor. Use a sheet metal
screw (D) to attach sensor to the
duct. Arrows in duct mount sensor indicate the direction the airow
should pass over the sensor for optimal readings (Figure 1).
3. Mount the humidistat 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. Plug the duct sensor into the humidistat. Pay close attention to the
orientation 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 away from the circuit board and push
onto the white connector in the bottom left corner. The wire colors are
also marked on the circuit board and match the correct orientation of
the plug wires.
Airow
Figure 1: Duct Sensor

Installation | RESIDENTIAL HUMIDISTAT
6 Form 16763
Figure 2: Duct Sensor Location
Figure 3: Duct Sensor Connection
Hook Up Away From
Circuit Board
Wire Colors
Return Duct
Locations for
Duct Sensor
Outdoor
Air Intake
Too Close
To Outdoor
Air Intake
Furnace

RESIDENTIAL HUMIDISTAT | Installation
Form 16763 7
Humidistat Option 2 — Wall Mount
1. Select a location in the living area of the residence. Typically the
humidistat will be placed on the wall near the main thermostat.
2. The humidistat should be placed in an area of sufcient 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.
Outdoor Temperature Sensor
When outdoor air temperature is very low condensation can occur on
windows and other surfaces which may cause damage to the house. To
minimize this risk the outdoor air temperature sensor should be installed, which
lowers the humidity setpoint to a safe level where the indoor relative humidity is
too low to condense. The outdoor temperature compensation controls adjusts
humidity according to the values in Table 1. The humidistat will automatically
detectiftheoutdoorairtemperaturesensorisconnectedand controltherelative
humidity setpoint accordingly.

Installation | RESIDENTIAL HUMIDISTAT
8 Form 16763
Outdoor Temperature Sensor Option 1 — Outdoors
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 sunlight
• where it may be covered by debris, snow, or ice
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

RESIDENTIAL HUMIDISTAT | Installation
Form 16763 9
Outdoor Temperature Sensor Option 2 —
Outdoor Air Intake
Mount the sensor in the outdoor air intake by drilling a 1/4 inch hole within
12” of outside. Angle the hole towards the outside. Insert the temperature
sensor into the intake pipe until the sensor is at least 2” outside the
wall of the house. Seal the hole and secure the wire so it cannot be
accidentally pulled out. See Figure 4 for example installation.
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.
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

Installation | RESIDENTIAL HUMIDISTAT
10 Form 16763
Wiring
**TURN POWER OFF TO ALL HVAC EQUIPMENT BEFORE WIRING**
Power Connection Wiring (R, C)
• The humidistat controller is powered from the R and C connections
from the furnace and needs continuous power to operate properly.
Proper R and C wiring is shown in Figure 5.
Outdoor Temperature Sensor Wiring (ODT)
• The outdoor temperature sensor wires will connect into the ODT
terminals on the humidistat terminal block as shown in Figure 5.
Heat Signal Wiring (W)
• The W terminal is the heat signal from the thermostat. Wire the W
terminal from the furnace control panel to the W terminal on the
humidistat terminal block as shown in Figure 5.
Automatic External Fan Control Wiring (G, GF)
• Fan control wiring should be completed when possible. If the fan
control wiring is not possible then the humidistat should only be ran in
Heat-Only Mode as described in the Operation section of this
document.
• The wire running from the G terminal on the furnace control board to
the G terminal on the thermostat will need to be disconnected. The G
terminal from the thermostat will then need to be wired directly to the
G terminal on the humidistat terminal block. The G terminal on the
furnace control panel will then need to be wired directly to the GF
terminal on the humidistat terminal block. See Figure 5.
HumidierControlWiring(H1+,H2-)
• The humidier control terminals are labeled on the humidistat as H1+
and H2-. These terminals will need to be wired directly to the humidier
as shown in Figure 5. H1+ on the humidistat terminal connects to the
HUM terminal on the humidier control panel and H2- on the humidistat
terminal connects to the GND terminal on the humidier control
panel.