Carrier HUMIDITRAC Setup guide

24V
RC
BYPASS
ODTH
POWER
HUMIDITRAC™HUMIDIFIER CONTROL
SAFETY AND INSTALLATION INSTRUCTIONS
READ COMPLETE INSTALLATION INSTRUCTIONS AND TEMPLATE BEFORE STARTING.
Attention Installer: WARNING This product must be installed by a qualified heating and air conditioning contractor.
Failure to do so could result in serious injury from electrical shock.
WARNING
1. 120 volts may cause serious
injury from electrical shock.
Disconnect electrical power to
the furnace before starting
installation.
2. Sharp edges may cause serious
injury from cuts. Use care when
cutting plenum openings and
handling ductwork.
CAUTION
1. Do not set humidity higher than recommended. Condensation damage may result.
2. Do not set humidity up to recommended levels if there is condensation on the inside of windows of any
unheated living space. Condensation damage may result.
3. Do not mount Humidifier Control on supply plenum or duct. The unit will not withstand supply temperatures.
4. When installing Humidifier Control on downflow furnaces, ensure blower continues to run after a heat call
is satisfied to eliminate high temperatures from damaging the Humidifier Control.
5. Do not mount Humidifier Control downstream of the bypass outlet. False humidity conditions will cause
humidifier to operate incorrectly.
THESE INSTALLATION INSTRUCTIONS ARE FOR THE HUMIDITRAC™HUMIDIFIER CONTROL ONLY!
For Humidifier installation, follow Humidifier Installation Instructions.
STEP 1: Unpack the Humidifier Control Carton
Make sure all components are present (see Figure A):
A. Humidifier Control C. Manual Mode Label
B. Outdoor Temperature Sensor D. Manual Mode Resistor Case
STEP 2: Disassemble the Humidifier Control
Remove door from the Humidifier Control by pulling the bottom of the door
straight out.
STEP 3: Check the Mode Switch
With the door removed, notice the switch labeled BYPASS and POWER
(partially covered by the enclosure). Make sure the switch is correctly set
for the type of humidifier being installed.
STEP 4: Check the Change Humidifier Pad Indicator Setting
This setting will control when the indicator light turns on, reminding you
to change your Humidifier Pad. If your Control came with a humidifier, the
Control is pre-set at position “C”. If the installation site has a 3-month
or shorter heating season or very hard water, you may want to adjust the
setting. (see Figure B). The Control must be energized to reset the
Humidifier Pad Indicator.
STEP 5: Determine Location for Humidifier Control
and Mount It
Humidifier Control must be mounted in the Return Duct. For proper
operation, the Humidifier Control must be at least 6 inches upstream of any
of the following:
• Humidifier
• Humidifier Bypass Ductwork (if applicable)
• Fresh Air Intake Ductwork (if applicable) (see Figure C)
After location for Control is selected, use the perforated Humidifier Control
template (attached to these instructions) to mark the duct opening and cut it.
Use 4 sheet metal screws (not provided) to mount the Humidifier Control in
the duct opening and make sure Humidifier Control is sealed tightly to duct.
Use the “OFF” setting to turn the
Humidifier Pad Change indicator OFF.
Use setting “A” for very
severe water conditions.
Humidifier Pad Change
indicator LED light will
activate after 75 hours of
solenoid valve operation.
RETURN
DUCT
HUMIDIFIER
FRESH AIR
INTAKE
BYPASS
CONNECTION
A
D
HUMIDIFIER
CONTROL
6” MIN.
Use setting “B” for climate
with milder winters typical
of the South.
Humidifier Pad
Change indicator LED light
will activate after 300 hours
of solenoid valve operation.
HUMIDIFIER
PAD CHANGE
INDICATOR
Use setting “C” for winters in the Midwest
and Eastern United States. Humidifier Pad
Change indicator LED light will activate after
600 hours of solenoid valve operation.
Figure C
Figure B
MODE
SWITCH
HUMIDIFIER
PAD INDICATOR
SETTING
Figure A
C
B
90-1009
90-1010
90-1011

36" MAX.
CENTER LINE
OUTSIDE WALL
STEP 9: Route the Wire from Control to Sensor
Run wire to the outdoor temperature sensor. Sensor is not affected by lead length. In either case, do not run outdoor temperature sensor alongside wires
carrying high voltage (120 VAC or higher). Secure the sensor bracket with a #8 galvanized screw.
STEP 10: Attach Sensor Wire to
Humidifier Control
Strip wire 1/4 inch, and insert the wires from
the Sensor into the terminals labeled “ODT”
on the Humidifier Control. See Figure F for
location of terminals.
Installing the Humidifier Control for Manual Operation
If it is not feasible to use the Outdoor Temperature Sensor, the Humidifier Control can be operated
in Manual Mode.
1. Connect the Manual Mode Resistor Case
wires to the terminals labeled “ODT” on the
Humidifier Control.
2. Snap the Manual Mode Resistor Case into the
slot provided so that Resistor Case sticks out
from the bottom edge of the base.
3. Remove the control knob and apply the
Manual Mode label to the cover, aligning the
sticker and knob holes. Re-install the knob.
STEP 8: Alternate Location for Outdoor Temperature Sensor
The Sensor can also be mounted in the center of either:
• 2 inch PVC fresh air intake pipe for the furnace
OR
• 6 inch fresh air intake duct. Mount the sensor with a #8 galvanized screw.
In both cases, the Sensor must be no more than 3 feet from the outside wall.
See Figure E.
If it is not feasible to use the Outdoor Temperature Sensor in any of the ways
described, the Humidifier Control can be installed for Manual Operation.
See box below and Figure G for details.
STEP 11: Determine Power Source for Humidifier Control
Determine where you will get 24 VAC to power the Humidifier Control based on the 2 options below:
OPTION 1: FURNACES WITH ACCESSORY TERMINALS. If the accessory terminals provide:
• 24 VAC: Wire these directly to the “R” and “C” terminals on the Humidifier Control.
• 120 VAC: Wire to a 24 VAC transformer, which in turn connects to the “R” and “C”
terminals on the Humidifier Control.
In either case, the voltage to the Humidifier Control must be between 22 VAC – 30 VAC.
OPTION 2: EXTERNAL 24 VAC TRANSFORMER:
Wire into a power source other than the furnace
blower circuit. The transformer can be powered off
the 120 VAC line at the junction box before it enters
the furnace. The 24 volt side of the transformer is
connected to the “R” and “C” terminals on the
Humidifier Control.
STEP 12: Wiring
NOTE: The control will function with either a switched or continuous 24 VAC power source. See Diagrams A-D for wiring options.
Figure E
Figure F
NOTES: • The Humidifier Control will operate properly with either a switched or continuous power source.
• Whether using ACCESSORY TERMINALS OR an EXTERNAL TRANSFORMER, the minimum VA required is; 2.0 VA for
Power Humidifiers; or 10.0 VA for Bypass Humidifiers.
• When power is connected for the first time, the red and green LEDs will light momentarily.
24V
RC
BYPASS
ODTH
POWER
R
24V
BYPASS
CODTH
POWER
Figure G
NORTH, EAST
OR WEST SIDE
OF HOME
OUTDOOR
TEMPERATURE
SENSOR
SENSOR
BRACKET
SENSOR
ABOVE EXPECTED
SNOW LINE
OUTDOOR
TEMPERATURE SENSOR
LEADS
Figure D
STEP 6: Determine Location for Outdoor Temperature Sensor
The location of the Outdoor Temperature Sensor must meet these three requirements:
1. Must be mounted on North, East or West side of house out of direct sunlight
2. Must be at least 3 feet from all exhaust vents
3. Must be above expected snow line (See Figure D)
Incorrect humidity levels will result if these requirements are not met.
STEP 7: Locate Existing Access Hole to Outside
A convenient way to get the Sensor wire outside is to make use of unused
wires running to the A/C condensing unit (if applicable). Other ways are to use
existing holes for Cable TV lines, telephone lines, A/C lines, etc. Read all
equipment instructions beforehand for possible conflicts and warnings.
90-998
90-999
90-1012
90-1013

TROUBLESHOOTING PROCEDURE
• Make sure furnace blower is operating and thermostat is calling for heat.
• Make sure the Outdoor Temperature Sensor is connected to the “ODT” terminals of the control. (For Manual Operation,
make sure Manual Mode Resistor
Case is in place.)
• Check main wiring diagram for
correct Humidifier Control installation.
• Check voltage at Humidifier Control
“R” and “C” terminals. Voltage
should be 22 VAC minimum – 30 VAC
maximum.
• Check Current Sensing Relay
(if used) for correct installation (see
Current Sensing Relay instructions).
Do not use Current Sensing Relay in
transformer circuit or “R” and “C”
circuit of Humidifier Control. Current
Sensing Relay is to be used in the
“H” circuit only.
• In “Test” mode, humidifier will
operate for 1 minute only. DO NOT
LEAVE IN TEST MODE AS
HUMIDIFIER WILL NOT OPERATE
• Make sure saddle valve is open.
Humidifier Control Troubleshooting Guide
Applies to both Automatic and Manual Operation unless indicated otherwise.
SYMPTOM
Humidifier does
not operate in
“Test” mode
System Checkout
1. For system Test/Reset, be sure that 24 VAC is applied to the “R” and “C” terminals
of Humidifier Control.
2. Snap the door back onto the Humidifier Control Base.
3. Activate furnace blower and be sure thermostat is calling for heat.
4. Rotate the control knob of Humidifier Control clockwise to the “Test/Reset” position.
When the knob is set in the “Test/Reset” position, the green “Change Humidifier Pad”
light will blink. Make sure the knob is not left in the “Test/Reset” position when the
installation is done. Rotating knob to test position resets the humidifier pad change timer
to zero. The Control must be energized to reset the Humidifier Pad Indicator.
5. If all is set up properly, you should be able to hear the solenoid valve click open.
In “Test/Reset” mode, the Humidifier will operate for 1 minute.
6. If the humidifier does not activate with the
Humidifier Control in the “Test/Reset” position,
refer to troubleshooting guide.
7. Setting the Humidifier Control:
• If home is occupied, set Humidifier Control to
“Normal” (For Manual Operation, set to 35%)
• If home is vacant, set Humidifier Control to “Off”
8. Inform homeowner to refer to the Owner’s Manual
for the initial adjustment period.
9. Make sure the Red Diagnostic Light is not lit. If the
Red Diagnostic Light is lit, re-check your wiring.
WARNING
Sharp edges on the opening may cause cuts. Use care when cutting the plenum opening
and installing the Humidifier Control.
CAUTION
• Do not mount Humidifier Control on supply plenum or duct. The unit will not withstand
supply temperatures and will malfunction!
• When installing Humidifier Control on counterflow furnaces, ensure blower continues
to run after a heat call is satisfied to eliminate high temperatures from damaging the
Humidifier Control.
• Do not mount Humidifier Control downstream of the bypass outlet. False humidity
conditions will cause humidifier to operate incorrectly.
1. CUT OUT TEMPLATE ALONG EDGES.
2. PLACE TEMPLATE ON THE RETURN PLENUM UPSTREAM OF (BEFORE) THE
HUMIDIFIER CONNECTION.
3. TRACE OUTSIDE EDGES OF TEMPLATE.
4. REMOVE TEMPLATE AND ACCURATELY CUT PLENUM OPENING.
5. USING 4 SHEET METAL SCREWS, INSTALL HUMIDIFIER CONTROL IN PLENUM OPENING.
HUMIDITRAC CONTROL
WIRING TERMINALS
24V
ODTH
RC
RC H ODT
24V
POWER BYPASS
SWITCH POSITION
OUTDOOR
TEMPERATURE
SENSOR
VARIABLE SPEED
FAN COIL
24 VAC
HUM 1
HUM 2
STANDARD FURNACE &
VARIABLE SPEED FURNACE
HUMIDITRAC CONTROL
WIRING TERMINALS
HUMIDIFIER
24 VAC LEADS
(COMMON)
C
HUM
(HUMIDIFIER)
24 VAC
TERMINALS
ON FURNACE
HUMIDIFIER CORD
PLUGGED INTO
120 VAC POWER SOURCE
24 VAC
120 VAC
TOTALINE P110-0050
CURRENT SENSING
RELAY
COMMON LEAD
24 VAC LEADS
FURNACE / AC
BLOWER MOTOR
TRANSFORMER
(FIELD SUPPLIED)
HUMIDIFIER
OUTDOOR
TEMPERATURE
SENSOR
HUMIDIFIER CORD
PLUGGED INTO
120 VAC POWER SOURCE
C
LO
HI
RC H ODT
24V
HUMIDITRAC CONTROL
WIRING TERMINALS
SWITCH POSITION
BYPASS POWER
24 VAC
SOLENOID VALVE
LEADS
HUMIDITRAC CONTROL
WIRING TERMINALS
OUTDOOR
TEMPERATURE
SENSOR
24V
ODTH
R
HUMIDIFIER
HUMIDIFIER
24 VAC
SOLENOID VALVE
LEADS
24 VAC
TERMINALS
ON FURNACE
24 VAC
120 VAC
120 VAC
“EAC”
TERMINALS
ON FURNACE TRANSFORMER
(FIELD SUPPLIED)
NOTE: CONNECT SOLENOID VALVE TO HOT
WATER IF HUMIDIFIER WILL BE OPERATED
INDEPENDENT OF HEATING CALLS.
C
HUM
C
OUTDOOR
TEMPERATURE
SENSOR
Diagram A
STANDARD FURNACE; VARIABLE SPEED FURNACE; VARIABLE SPEED FAN COIL
Diagram B
STANDARD FAN COIL
Diagram C
FOR OPERATION DURING
“HEAT CALL” ONLY
Diagram D
FOR OPERATION WHEN
BLOWER IS ENERGIZED
FAN POWERED HUMIDIFIER WIRING DIAGRAM BYPASS HUMIDIFIER WIRING DIAGRAM
90-1017 90-1018

Humidifier Control Troubleshooting Guide
Applies to both Automatic and Manual Operation unless indicated otherwise.
Humidifier operates
constantly
Humidifier or Humidifier
Control “chatters” or
clicks ON and OFF rapidly
Red Diagnostic Light is on
(See Figure H)
• If the humidity level in the home is less than the knob setting, the Humidifier Control will operate the Humidifier until
the humidity level is higher than the knob setting.
• In the “Test” mode, verify unit will operate for approximately one minute.
• Check the resistance of the Outdoor Temperature Sensor as instructed above.
• Make sure the Outdoor Temperature Sensor is mounted completely outside the house on the North, East, or West
side of the house and out of direct sunlight. (Automatic Mode Only).
• Rotate the Humidifier Control knob counterclockwise to the “Off” position, and observe whether the humidifier turns
off. If the humidifier still operates in the “Off” position, perform the following:
1. Check summary wiring diagram for correct Humidifier Control Installation.
2. Remove wires from Humidifier Control’s “H” terminals. If Humidifier continues to operate, replace solenoid valve.
• Check for steady 22 VAC – 30 VAC with voltmeter.
• Make sure Outdoor Temperature Sensor wiring is not run alongside wires carrying high voltage (120 VAC or higher).
(Automatic Only)
• Check that the wiring is correct.
• Measure the resistance of the Outdoor Temperature Sensor by
removing the leads from the terminal and measuring the resistance
across the wires with an ohmmeter. Confirm the reading with the
temperature in Table 1. (For Manual Operation, verify that the
resistance across the leads of the Manual Mode Resistor Case is
between 44,000 and 48,000 ohms).
10006721 10.05
B2203904A
Form/Catalog: IM-AHC-01
© 2005 CAC/BDP
7310 West Morris St.
Indianapolis, IN 46231
24V
RC
BYPASS
ODTH
POWER
RED
DIAGNOSTIC
LIGHT
Figure H
Humidifier operates only
in “Test” mode
TABLE 1
Resistance
kΩ
-30˚F
-20˚F
-10˚F
0˚F
10˚F
20˚F
30˚F
40˚F
50˚F
60˚F
70˚F
80˚F
90˚F
100˚F
230.6
163.8
117.6
85.4
62.6
46.3
34.6
26.1
19.9
15.3
11.9
9.4
7.4
5.9
Outdoor
Temperature
• If outdoor temperature is greater than 60°F or less than -30°F, the Humidifier Control will
only operate in the “Test” mode. (For One Minute)
• If the humidity level in the home is higher than the knob setting, the Humidifier Control
will not operate the Humidifier.
• Check the resistance of the sensor by removing the leads of the Outdoor Temperature
Sensor from the terminals and measuring the resistance across the wires with an
ohmmeter. Compare reading to outdoor temperature in Table 1. (For Manual Operation,
verify that resistance across the leads of Manual Mode Resistor Case is between 44,000
and 48,000 ohms).
• Make sure the Outdoor Temperature Sensor is mounted completely outside the house
on the North, East, or West side of the house and out of direct sunlight. (Automatic
Mode Only)
• If Outdoor Temperature Sensor is mounted in fresh air intake duct, make sure the probe
is no more than 36 inches from the outside wall. (Automatic Mode Only)
• Make sure the Outdoor Temperature Sensor is located at least 3 feet away from all
exhaust vents. (Automatic Mode Only)
SYMPTOM TROUBLESHOOTING PROCEDURE
HUMIDIFIER
CONTROL
TEMPLATE
• Call your installer to have your Humidifier Pad changed, or visit your installer to purchase a new Humidifier Pad.
Follow the instructions on the Humidifier Pad box.
“Change Humidifier Pad”
Indicator is lit.
90-1016