Aprilaire 400 Troubleshooting Guide download pdf (Page 2)

STEP 9: Route the Wire to Chosen Sensor Location

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). Attach the sensor bracket to the house 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 loca-

tion 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 installed

in Manual Mode.

1. Insert the Manual Mode Resistor Case into

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

• 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 would connect 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

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.

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