Humidifier Control Troubleshooting Guide - Aprilaire 110 Safety And Installation Instructions

SYMPTOM TROUBLESHOOTING PROCEDURE
Humidifier operates only in
• If outdoor temperature is greater than 60°F or less than -30°F, the Humidifier Control will only
"Test" mode
• If the humidity level in the home is higher than the knob setting, the Humidifier Control will
• Check the resistance of the sensor by removing the leads of the Outdoor Temperature
• Make sure the Outdoor Temperature Sensor is mounted completely outside the house on the
• If Outdoor Temperature Sensor is mounted in fresh air intake duct, make sure the probe
• Make sure the Outdoor Temperature Sensor is located at least 3 feet away from all exhaust
Humidifier operates • If the humidity level in the home is less than the knob setting, the Humidifier Control will operate the Humidifier until the
constantly
• 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
• Rotate the Humidifier Control knob counterclockwise to the "Off" position, and observe whether the humidifier turns off. If
• Check for steady 22 VAC – 30 VAC with voltmeter.
Humidifier or Humidifier
Control "chatters" or
• Make sure Outdoor Temperature Sensor wiring is not run alongside wires carrying high voltage (120 VAC or higher).
clicks ON and OFF rapidly
Red Diagnostic Light is on
• Check that the wiring is correct.
• Measure the resistance of the Outdoor Temperature Sensor by

Humidifier Control Troubleshooting Guide

Applies to both Automatic and Manual Operation unless indicated otherwise.
operate in the "Test" mode. (For One Minute)
not operate the Humidifier.
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).
North, East, or West side of the house and out of direct sunlight. (Automatic Mode Only)
is no more than 36 inches from the outside wall. (Automatic Mode Only)
vents. (Automatic Mode Only)
humidity level is higher than the knob setting.
the house and out of direct sunlight. (Automatic Mode Only).
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.
(Automatic Only)
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).
Temperature
P.O. BOX 1467 • MADISON,WI 53701-1467
Call 608/257-8801 • FAX 608/257-4357
HUMIDIFIER
CONTROL
TEMPLATE
TABLE 1
Outdoor Resistance
kΩ
-30˚F 230.6
-20˚F 163.8
-10˚F 117.6
0˚F 85.4
10˚F 62.6
20˚F 46.3
30˚F 34.6
40˚F 26.1
50˚F 19.9
60˚F 15.3
70˚F 11.9
80˚F 9.4
90˚F 7.4
100˚F 5.9
Red Diagnostic Light
Figure L
10005402 05.05
B2202617B