Honeywell H1008A1008
Honeywell HumidiCalc Auto Humidistat 24v
No Longer Available. Use model H6062A1000 as alternative.

No Longer Available. Consider the H6062A digital automatic humidity control.

H1008A1008 humidistat provides 24 volt automatic control for by-pass flow-thru, powered flow-thru, steam and drum humidifiers in central heating systems. Color Taupe.

The H1008 determines the outside temperature based on the duty cycle of the furnace or with an optional outdoor sensor. Simply the more the furnace runs the colder the outside temperature.

This feature of estimating the outside temperature based on the furnace run time is called HumidiCalc. HumidiCalc is software that is built-in to the H1008 and not user installed or accessible.

HumidiCalc only works on a single stage furnace (single speed). A two stage or a variable speed furnace would have a low and high heat. The furnace starts on low heat and if the house does not come up to temperature with in a preset time then the furnace switches to high heat. High heat would have an increased flame and blower.

HumidiCalc can not infer the outside temperature on a two stage or variable speed furnace. These furnaces require the outside temperature sensor (C7089H).

The H1008 requires a connection to full-time 24vac power as well as 24v that is only present when the furnace is running. See the installation instructions.

√ Patented Honeywell HumidiCalc Software eliminates need for an outdoor sensor on the most common single-stage, gas or oil forced-air furnace.

√ Combination temperature and humidity sensor accurately determines the dew point at the control location.

√ With the use of the C7089H Outdoor Temperature Sensor, the H1008 also provides automatic humidity control in heat pump applications.

√ Automatically adjusts humidity level based on the frost factor set by the homeowner.

√ System status light indicates normal operation, test mode and fault indication.

Product Specifications

Description Dew point Control of Humidifier
Application Humidification
Type Humidity Control
Voltage 24 Vac
Electrical Rating 2.0 A at 24 Vac Humidifier Cntacts
Color Taupe
Mounting Duct mount only
Differential ±2½ F
Temperature Range 45° F to 88° F
7° C to 31° C
Operating Range 95% RH at 95 F, non-condensing
Dimensions (in) 4-7/32 high x 5-1/4 wide x 1-31/32 deep
Dimensions (mm) 107 mm x 133 mm x 50 mm

Manual Versus Automatic Humidistat

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.

An automatic humidistat (Aprilaire 60) adjusts the humidity by using an outside temperature sensor.

The Aprilaire manual humidistat as used in earlier Aprilaire humidifiers (Model 4655) requires adjusting the relative humidity based on the outside temperature. A manual humidistat needs to be set back as the season gets colder. The chart below shows the humidity setting for a range of outside temperatures.

When The Outdoor
Temperature is
This Relative Humidity
Should Be Maintained
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