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For automatic applications…
• Make sure the outdoor temperature sensor is mounted completely outside
the house (i.e., not recessed into the hole) on the North, Northeast or North-
west side, away from direct sunlight.
• Make sure the outdoor temperature sensor is mounted at least three feet
away from all exhaust vents.
• If the outdoor temperature sensor is mounted in the fresh air intake duct,
make sure the probe is no further than 30 inches from an outside wall.
NOTES:
In AUTOMATIC applications, if the outdoor temperature is greater than
+50°F (+10ºC) or less than -32°F (-35.6ºC), the humidifier control will not
operate (except in “Test” mode).
In both AUTOMATIC and MANUAL applications, if the relative humidity
in the home is higher than the knob setting, Compustat will not operate the
humidifier. Similarly, Compustat will not operate if the indoor relative
humidity exceeds 45 percent.
Humidifier operates constantly
• Check the humidifier control setting. If the relative humidity in the home is
less than the knob setting, the humidifier will operate until the humidity level
is higher than the knob setting.
• In the “Test” mode, verify that the humidifier will shut off after approxi-
mately one minute.
• Check the resistance of the sensor. (See previous section.)
For automatic applications…
• Make sure the outdoor temperature sensor is mounted completely outside
the house (i.e., not recessed into the hole) on the North, Northeast or North-
west side, away from direct sunlight.
• Turn the humidifier control knob counterclockwise (4) to the “Off” posi-
tion and observe whether the humidifier turns off. If the humidifier continues
to operate, perform the following:
— Check the wiring diagrams (Figures 5-8) for correct installation.
— Remove the wires from the humidifier control’s “Out” terminals. If the
humidifier continues to operate, check the humidifier.
Humidifier or humidifier control • Use a voltmeter to check for a steady 22-to-30VAC.
“chatters” or clicks on and off • For automatic applications, make sure the outdoor temperature sensor wiring
rapidly does not
run alongside wires carrying high voltage (120 VAC or higher).
100°F 6,000 ohms 38°C
90°F 7,500 ohms 32°C
80°F 9,500 ohms 27°C
70°F 11,500 ohms 21°C
60°F 14,000 ohms 16°C
50°F 18,000 ohms 10°C
40°F 23,000 ohms 4°C
30°F 28,500 ohms -1°C
20°F 37,000 ohms -7°C
10°F 46,500 ohms -12°C
0°F 61,500 ohms -18°C
-10°F 78,500 ohms -23°C
-20°F 105,500 ohms -29°C
-30°F 135,000 ohms -34°C
Temperature/Resistance Chart