Fig. 10. Install tubing.
CONNECT TUBING TO + CONNECTION IF PRESSURE TAP IS MOUNTED TO SUPPLY DUCT. CONNECT TO – IF PRESSURE TAP IS
MOUNTED TO RETURN DUCT.
M27304
8. You may cut the tubing to fit the connection length between the tubing fitting elbow and switch. It is also recommended to secure the hose to existing
structures to avoid accidental disconnection.
Installing the Humidistat
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. 12.
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 codes, ordinances, and regulations.
Wire the humidifier solenoid valve, pressure switch, humidistat, and transformer. See Fig. 13.
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