Nortec NHRS 010-090, Installation And Operation Manual

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Installation | 22
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 NHRS humidifier can be operated
with a modulating input or as On/Off.
Control Location
Figure 13: Control Location (Duct Humidification)
Duct Humidification
1 Air Proving Switch

Locate so that it can sense air flow, or lack thereof.
2 Duct High Limit

NHRS operates with On/Off control.

Locate at least 10 feet (3.0 m) from steam distributor, or far enough that steam is
fully absorbed under normal conditions.
3 Humidity Control

NHRS 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 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.