Nortec SE Series - Manual (Page 26)

23 | Installation
External Controls
Control Wiring
Controls are available from Nortec as accessories. If controls were not ordered with humidifier
they must be supplied by others. The following information is relevant to all controls, factory
supplied or otherwise. For wiring use minimum of 18 AWG and keep as short as possible.
The SETC humidifier can be operated with two modulating inputs. The SEP has one modulating
input which can be used for a duct high limit or humidity control. Both the SETC and SEP can be
operated as On/Off. See Control Setting on page 53 for SETC configuration and On/Off or
Modulating Control (J10) on page 61 for SEP configuration.
Control Location
Figure 20: Control Location
1 Air Proving Switch

Locate so that it can sense air flow or lack of it.
2 Duct High Limit

SETC can be modulating, On/Off, or a humidity sensor. SEP can be modulating or On/Off.

Locate at least 10 feet from steam distributor or far enough that under normal conditions
steam is fully absorbed.
3 Humidity Control

SETC can be Modulating, On/Off, or a Humidity Sensor. SEP can be modulating or On/Off.

Can be located either in return air duct (preferred) or in room being humidified.

Mount in area representative of room humidity (draft, doorways, sunlight, or overhang such
as a shelf can affect reading). Avoid placing near discharge diffuser of humidified air.
Note: Regardless of selecting on/off or modulating control method, Nortec humidifiers
must have a closed circuit across their on/off security loop control terminal to
operate. Nortec highly recommends the use of a high limit humidistat and an air
proving switch in series for this function.
Caution: Failure to wire the humidifier in accordance with the wiring instructions could
cause permanent damage. Such errors will void the warranty.
1 2 3
10 ft min.
Humidity
Control
(return air
duct or
in room) Duct High
Limit
Air
Proving
Switch