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5. Connect the other end of the tubing to the applicable pressure connection on the switch.
a. If the humidifier is installed on the supply duct (as is recommended), the tube that inserts into the
humidifier needs to be attached to the black port, and the tube that runs to the return duct needs to be
attached to the gray port.
b. If the humidifier is installed on the return duct, the tube that inserts into the humidifier needs to be
attached to the gray port, and the tube that runs to the supply duct needs to be attached to the black
port.
6. 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
1. Separate wallplate from humidistat.
CAUTION
Electrical Hazard
Can cause electrical shock or equipment damage. Disconnect power before beginning installation.
Fig. 11. Installing the pressure switch tubing.
Replace Batt
Replace Batt
Inside
HUMIDITY BOOST
Light
Fig. 12.
M33326
PULL HERE
Setting
%
%
System
Next
Auto
M34565A
9
HE240, HE280 HUMIDIFIER
69-2685ES—07
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