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Rev 2.0
63-7048 1998 Honeywell Inc.
Page 7 of 22
The AutoTrac
control does not have the ability to provide true dewpoint control. This
may result in overhumidification at times when the temperature is greater than normal
conditions and underhumidification if the temperature is less than normal conditions. For
example, if during night setback the temperature was 60
F, if the AutoTrac
were able
to achieve its 45 %RH, the dewpoint would be 39
F. If the temperature were raised to
72
F during recovery, the relative humidity would only be 30 %. All opportunities to
humidify during setback would be lost.
Some additional items noted during our testing of this product (conducted in the fall
of 1997):
If the outdoor sensor fails open, or is not connected, the humidistat will not
function, with no feedback to the user.
If the sensed outdoor temperature exceeds 50
F, the humidistat will not function,
losing opportunities to humidify under those conditions.
The concept of adjusting the indoor humidity level depending on what is happening
outdoors in one that we embrace – in fact, Honeywell pioneered the concept with the
Perfect Climate Comfort Center
. What we heard that installing contractors do not
embrace is the time and effort required wiring an outdoor sensor – up to an hour on some
jobs. So, armed with an unequalled knowledge of comfort systems, we set out to design a
humidity control with exceptional performance, that would also make life easier for the
installing contractor.
H1008 Automatic Humidity Control with HumidiCalc+
- The Basic Idea
The idea for the H1008 Automatic Humidity Control
was born by considering some very
obvious facts:
Wiring between the humidity control and an outdoor sensor can be very
difficult
Humidifiers and duct mounted humidity controls are usually installed near the
HVAC equipment
Wiring between the humidity control and the HVAC equipment would usually
be pretty easy
If you could replace the wiring from the humidity control to the outdoor
sensor with wiring to the HVAC equipment, it would save a lot of time
Here’s a few more:
By monitoring the W terminal on your furnace, you could tell how much it
was running
The colder it gets outside the more your furnace runs
You’re probably starting to see where this is headed. Here’s the basic idea - if we could
estimate the outdoor temperature by monitoring the calls for heat, we could conceivably
replace the outdoor sensor with some simple wiring between the HVAC equipment and
the humidity control.