Nortec HP Series - Manual (Page 26)

23 | HP Series Installation Manual
Leave the disconnect in an open (off) position until all wiring has been completed
Connect the input voltage to the valve controller. Input voltage connections are clearly indicated
by labels inside of the valve controller box.
Wiring of the System
On-Off Safety Devices
Safety switches are available to prevent the humidifier from operating excessively or at incorrect
times. These may include; air proving switches (A), duct high limit switches (B), disable switches
(C), other on-off type devices.
Install these devices in accordance with their respective installation instructions. All on-off style
devices should be wired in series and connected between terminals 1 and 2 on the valve
controller terminal strip.
The circuit between terminals 1 and 2 is a 24VDC circuit, 16 or 18 AWG standard wire should
be used for this purpose.
The humidifier will only operate if there is continuity between terminals 1 and 2. If no on/off style
safeties are to be used, install a jumper between terminals 1 and 2.