Nortec NH-EL Series - Manual (Page 25)

Installation | 22
1 2 3
10 ft min.
Humidity
Control
(return air
duct or
location
representative
of the room) Duct High
Limit
4
Out
door
temp.
sensor.
Air
Proving
Switch
1 2 3
10 ft min.
Humidity
Control
(return air
duct or
location
representative
of the room) Duct High
Limit
4
Out
door
temp.
sensor.
Air
Proving
Switch
External Controls
Control Wiring
The following information is relevant to all controls, factory supplied or otherwise. For wiring use
a minimum of 18 AWG and keep as short as possible. The NH-EL humidifier can be operated
with two modulating inputs. Signal types must be the same (both demand or both transducer).
The NH-EL can also be operated as On/Off. See NH-EL Humidifier Configuration on page 54 for
configuration.
Control Location
Figure 13: Control Location (Duct Humidification)
Duct Humidification
1 Air Proving Switch

Locate so that it can sense air flow or lack of it.
2 Duct High Limit

NH-EL can be modulating, On/Off, or a humidity sensor.

Locate at least 10 feet from steam distributor or far enough that under normal conditions
steam is fully absorbed.
3 Humidity Control

NH-EL can be Modulating, On/Off, or a Humidity Sensor.

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.
4 Outdoor Temperature Sensor

Mount in area representing outdoor air temperature (makeup air duct, outside).
Caution: Failure to wire the humidifier in accordance with the wiring instructions
could cause permanent damage. Such errors will void the warranty.