Installation Instructions

INSTALLATION INSTRUCTIONS
69-1341EF-01
H8908A/B Humidistat
H8908C/D Dehumidistat
APPLICATION
The H8908 family of low-voltage humidistats/
dehumidistats provide accurate control of whole house
humidifiers, dehumidifiers, and ventilators. They have a
snap-acting, dust-proof SPST switch and can be
mounted to a duct or wall.
Before Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
CAUTION
Personal Injury Hazard.
Power supply can cause electrical shock.
Disconnect power supply before beginning
installation.
NOTE: The H8908 electrical connections are not
shared with the thermostat.
Fig. 1. H8908A,D control.
Fig. 2. H8908B,C control.
M24726
Humidity Control
Régulateur d'humidité
-2
0
°F
-1
0
°F
0
°F
+
1
0
°
F
+
2
0
°F
O
v
e
r 2
0
°F
1
5
%
2
0
%
2
5
%
3
0
%
3
5
%
4
0
%
H
U
M
ID
IT
Y
S
E
T
T
IN
G
O
U
T
D
O
O
R
T
E
M
P
E
R
A
T
U
R
E
-3
0
°
C
-2
5
°C
-2
0
°C
-1
0
°
C
-5
°C
O
ve
r 0
°
C
M13371
CASE REMOVAL
SLOT
HOLE FOR WIRING
THE DUCT MOUNTING
INSTALLATIONS