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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-
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
3. Installer must be a trained, experienced service
Personal Injury Hazard.
Power supply can cause electrical shock.
Disconnect power supply before beginning
NOTE: The H8908 electrical connections are not
shared with the thermostat.
Fig. 1. H8908A,D control.
Fig. 2. H8908B,C control.
Over 20 F
Over 0 C
HOLE FOR WIRING
THE DUCT MOUNTING