Both grey and black if installed on both
IMPORTANT
With low-speed airflow or variable speed systems it is recommended to run tubing to both the supply and
return ducts.
8. You may cut the tubing to fit the connection length between the elbow fitting and switch. It is also recommended
to secure the hose to existing structures to avoid accidental disconnection.
Installing the Humidistat
Fig. 13. Humidistat base and rear view.
Installing on Mounting Duct
1. Apply the template to the duct location chosen for the humidistat. Make sure the template is level before drilling
the holes.
2. Refer to the template (provided with the H8908 Humidistat Installation Instructions) to drill the control assembly
opening and mounting holes for the H8908.
3. Remove the H8908 case from the base.
4. Position the foam gasket on the H8908 base.
5. Position the base on the duct with the arrow up.
6. Secure the base to the duct using the four 1 in. (25 mm) mounting screws provided with humidistat.
7. Connect the low-voltage wires to the leads and replace the H8908 case. See Fig. 14.
Fig. 14. Wiring the controls.
NOTE: For wall mounting instructions, see the H8908 Installation Instructions.
WIRING
CAUTION
Hazardous Voltage: Can cause personal injury or equipment damage.
Disconnect power supply before installing or servicing equipment.
IMPORTANT: All wiring must comply with applicable local code, ordinances and regulations. Wire the humidifier
solenoid valve, pressure switch, humidistat and transformer. See Fig. 15.
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