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automatic autotrac rp-56 humidistat computerized


Aprilaire Model 56 automatic humidistat designed for low voltage (24v) humidifier control. Computer-equipped, completely automated, never needs manual adjustments. The advanced computer technology measures the outdoor temperature and indoor humidity and continually adjusts your homes indoor humidity to its optimum level.
Includes humidistat, outdoor temperature sensor with 36 inch wire and bracket, manual mode resistor.
The outdoor temperature sensor is located outside and is connected to the humidistat with regular 2-conductor thermostat wire. The 2-conductor thermostat wire is included.
The indoor humidity level needs to be set based on the outside temperature. This is to prevent water from running down the windows. The cool air near the windows can not hold the humidity and water will condense on the glass. To prevent this condensation, the indoor humidity level is sacrificed by lowering the humidistat.
A manual humidistat needs to be set back as the season gets colder. An automatic humidistat (such as the Aprilaire 56) adjusts the humidity by using an outside temperature sensor.
The Honeywell automatic humidistat (H1008A) determines the outside temperature based on the furnace duty cycle or with an optional outdoor sensor. Below the Honeywell owners manual discusses this feature they call HumidiCalc.
here are some links for more info
http://docs.electronicaircleaners.com/aprilaire_56_installation.pdf
http://docs.electronicaircleaners.com/aprilaire_56_owners.pdf
http://electronicaircleaners.com/images/honeywell_humidifier/humidistat_manual_vs_automatic_r3_c2.gif
http://docs.electronicaircleaners.com/honeywell_h1008_installation.pdf
note the unit up for sale is the first style of the rp-56 model series without the change water panel indicator light (ie 1 year timer) and is block shaped instead of smooth. these are the only differences and the unit will function the same as the newer style of the rp-56.
in light of this i offer a 3 month warranty