AutoFlo S2020 - Manual (Page 4)

10. SETTING THE HUMIDISTAT
Connect field wiring as shown in Figures 5 or 6.
It is recommended that humidistat settings of 30-40% not be
exceeded. If condensation is noticed on windows during
very cold outside temperatures, the humidistat setting should
be lowered.
4
RELATIVE HUMIDITY CHART
Outside
Temperature
Outside
Relative
Humidity
Indoor Relative
Humidity
When Outside
Air Is Heated To
72 Degrees F
Maximum Safe
Recommended Indoor
Relative Humidity
-10 Deg. F
10 Deg. F
20 Deg. F
30 Deg. F
0 Deg. F
40%
40%
40%
40%
40%
60%
60%
60%
60%
60%
80%
80%
80%
80%
80%
1%
2%
2%
5%
8%
13%
2%
4%
6%
8%
2%
5%
7%
11%
17%
20%
25%
30%
35%
40%
FIG. 6
Furnace
S2000 & S2020 Humidifier
Humidistat
G1 R G2 H H
Heat only
Thermostat
W R
G W R
Heat Only System
The maximum recommended relative humidity for your
home depends upon factors such as outdoor air temperature,
type and placement of insulation, vapor barriers,
effectiveness of weather stripping, type of windows and
doors (including frames and jambs) and whether or not storm
windows and doors are used. With all these variables it is
nearly impossible to recommend a proper humidity setting.
The best humidistat setting is one that you are comfortable
with. Also, as the outdoor temperature fluctuates, it may be
necessary to adjust the humidity level of your system a few
times during the heating season.
Refer to the "Relative Humidity Chart" as a starting point for
your proper humidistat setting. Generally, in a tighter and
better insulated house, the humidistat may be set higher than
in a drafty, un-insulated house.
IMPORTANT: If the humidifier is installed in the return air
plenum the humidistat must be located at least three (3) feet
upstream from the humidifier. Fan should be operated in
continuos mode when humidistat is mounted in the return air
plenum.
The humidistat has two (2) screw terminals which should be
connected to the low-voltage interlock plug. (Figure 5).
Wiring instructions for the 072000 model Humidistat are
packaged with the 072000.