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Rev 2.0
63-7048 1998 Honeywell Inc.
Page 6 of 22
Outdoor Temperature Compensating Humidity Controls
Honeywell, with the Perfect Climate Comfort Center
, was the first to introduce an
electronic humidity control system for the residential market designed to automatically
adjust humidity levels based on outdoor temperature. This system also considers the
effect of indoor temperature in its algorithm, providing optimum control for all
combinations of indoor and outdoor temperature.
The Honeywell H1008 Automatic Humidity Control, when installed with the C7089H
Outdoor Temperature Sensor, functions as a true dewpoint control, just like the Perfect
Climate Comfort Center
.
In 1997, Research Products introduced its AutoTrac
2
control. The AutoTrac
is a
stand-alone, electronic humidistat that, when installed with an outdoor sensor, will adjust
the relative humidity setpoint per a programmed reset schedule. We have tested the
AutoTrac
and found that it does perform as advertised. It attempts to control to 45 %
RH, until the outdoor sensor value reaches the point at which a ½ % RH reduction in
setpoint is made per
F change in outdoor sensor value. Figure 4 graphically shows the
linear reset curves.
Figure 4 – Research Products’ AutoTrac
Outdoor Temperature Compensation
2
AutoTrac is a trademark of Research Products Corporation.
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
-30-25-20-15-10-5 0 5 101520253035404550
Outside Temp - deg F
Relative Humidity - %
Knob Setting = 1
Knob Setting = 2
Knob Setting = 3
Knob Setting = 4
Knob Setting = 5
Knob Setting = 6
Knob Setting = 7