Question about Aprilaire 700 Humidifier
Installed an Aprilaire humidifier model 700 with a model 56 Humidistat Wiring is: correct, verified several times. Both Outside and inside sensors read okay. HH goes to Humidifier (24VAC when unit is plugged in) RC go to furnace W and 24 VAC common) and reads 24VAC when furnace is running, ODT go to outdoor sensor Plugged in the unit to 110 and both the Green and Red lights came on briefly then turned off. Dial set at 7 outside temp is 24F Humidifier only runs when in the test position with either outside or inside resistor and in auto or manual mode. Could the model 65 circuit board be bad? How to verify? Any assistance appreciated
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Posted on Jan 02, 2017
you need to make sure your humidity level in the house isnt higher then what your humidifier will provide at any givin outdoor temp. this chart is in the owners manual. you cant remove the wires going to the ODS or it will give an error unless you have a resistor to put in its place. Anyway if the humidifier works in test mode according to AA it works so you may have higher humidity than you think, the highest your gonna get is 45% as the temp outside drops it will allow less humidity so it doesnt cause window condinsation (property damage) here is a copy of the chart. the #s on the left are the dial setting
TABLE 2 – % Relative Humidity Guide
Outdoor Temperature (°F)
-10°F 0°F 10°F 20°F 30°F 40°F
1 10% 10% 10% 15% 20% 25%
2 10% 10% 15% 20% 25% 30%
3 10% 15% 20% 25% 30% 35%
4 15% 20% 25% 30% 35% 40%
5 20% 25% 30% 35% 40% 45%
6 25% 30% 35% 40% 45% 45%
7 30% 35% 40% 45% 45% 45%
Posted on Nov 29, 2009
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