Aprilaire 110 Setup guide

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 APRILAIRE HUMIDIFIER CONTROL ONLY!
For Aprilaire®Humidifier installation, follow Aprilaire 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.
POWER HUMIDIFIERS: 110, 112, 445, 448, 760, 700 (formerly 768)
BYPASS HUMIDIFIERS: 220, 224, 400, 440, 550, 558, 560, 568, 600
STEP 4: Check the Change Water Panel indicator setting.
This setting will control when the indicator light turns on, reminding you to change
your Water Panel. If your Control came with a humidifier, the Control is pre-set. 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 Water Panel 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
Water Panel Change indicator OFF
Use setting “A” for Model 400
humidifiers. The indicator will
light after 75 hours of inlet valve
operation, which corresponds
to approximately 300 hours of
humidifier operation.
RETURN
DUCT APRILAIRE HUMIDIFIER
FRESH AIR
INTAKE
BYPASS
CONNECTION
A
D
HUMIDIFIER
CONTROL 6” MIN.
Use setting “B” for Model 600
and 700 humidifiers when the
heating season is 3 months or
less, or if hard water is used.
The indicator will light after 300
hours of humidfier operation.
Water
Panel
Change
Indicator
Use setting “C” for Model 600 and 700
humidifiers when the heating season is
longer than 3 months.
The indicator will
light after 600 hours of humidfier operation.
Figure C
B2202617
Figure B
Mode
Switch
Figure A
C
B

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.
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 (Models 110, 112, 445, 448, 700, 760, 768); or 10.0 VA for Bypass Humidifiers (Models 220, 224, 400, 440, 550, 558, 560, 568, 600)
• When power is connected for the first time, the red and green LEDs will light momentarily.
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.

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.
• If connected to a Model 400 Humidifier, make sure both floats in the bottom of the scale control insert are in the down
position. If necessary, dump out water to lower floats.
• Check voltage at Humidifier Control “R” and “C” terminals. Voltage should be 22 VAC minimum – 30 VAC maximum.
• Check Model 50 Current Sensing Relay
(if used) for correct installation (see
Model 50 instructions). Do not use
Model 50 Relay in transformer circuit
or “R” and “C” circuit of Humidifier
Control. Model 50 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
• Call your installer to have your Water
Panel changed, or visit your installer to
purchase a new Aprilaire Water Panel.
Follow the instructions on the Water
Panel box.
“Change Water Panel”
Indicator is lit.
STEP 12: Humidifier Wiring
Strip the wires used for all the Humidifier Control terminal connections 1/4 inch.
• If FURNACE ACCESSORY TERMINALS are used, wire the humidifier solenoid valve in series with the “H” terminals on the Humidifier Control without using a Model 50 Relay.
See furnace manual for operation of accessory terminals. (Figure H)
• If an EXTERNAL TRANSFORMER is used, a Model 50 Current Sensing Relay must be connected to the solenoid valve and the “H” terminals on the Humidifier Control to allow
the humidifier to operate only when the blower is on. (Figure I) Wire the Model 50 Relay into the “H” circuit only.
• If connected to a MODEL 8570 THERMOSTAT, connect the “R” and “C” terminals to a constant power transformer. Wire the “I+” and “I-” terminals from the Humidifier
Control to the corresponding terminals on the 8570. No Model 50 Current Sensing Relay is required. (Figure J)
• If connected to a MODEL 6504 INTELLIGENT ZONED COMFORT CONTROL SYSTEM, wire the “R”, “C”, “I+” and “I-” terminals on the Humidifier Control to the corresponding
terminals on the 6504. No Model 50 Current Sensing Relay is required. (Figure K)
Bypass and Power units are wired to the AHC in the same fashion.
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 Water Panel”
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 water panel change
timer to zero. The Control must be energized to reset the Water Panel Indicator.
5. If all is set up properly, you should be able to hear the solenoid valve click open. In
“Test/Reset” mode, the Aprilaire 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 Aprilaire 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.
FURNACE
ACCESSORY
TERMINALS
(10 VA MINIMUM)
Figure H
Furnace
Accessory
Terminal
TRANSFORMER
(10 VA MINIMUM)
FURNACE BLOWER
Figure I
Constant
Power with
External
Transformer
AUTOMATIC HUMIDIFIER
CONSTANT POWER
TRANSFORMER
MODEL 8570
THERMOSTAT
Figure J
8570
Thermostat
AUTOMATIC HUMIDIFIER
MODEL 6504 ZONE CONTROL
Figure K
6504 - Intelligent Zoned
Comfort Control System

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
• 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).
P.O. BOX 1467 • MADISON,WI 53701-1467
Call 608/257-8801 • FAX [phone]
10005402 05.05
B2202617B
Red Diagnostic Light
Figure L
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