Nortec RH2+ - Manual (Page 20)

17 | Installation
External Controls
Control Wiring
Controls are available from Nortec as accessories. If controls were not ordered with humidifier,
they must be purchased or supplied by others. The following information is relevant to all
controls, factory supplied or otherwise. For wiring use minimum 18 AWG and keep as short as
possible.
The RH2 humidifier can be operated with either On/Off controls only or with On/Off controls and
one modulating input. The modulating input can be from a duct high limit or humidity control
humidistat. See Humidifier Configuration on page 38 to configure the RH2 for modulation.
Duct Humidification Control Location
Figure 16: Control Location (Duct Humidification)
Duct Humidification Control Location
1 Air Proving Switch
o Locate upstream so that it can sense air flow or lack of it.
2 Duct High Limit – Can be modulating or On/Off humidistat.
o Locate at least 10 feet downstream from steam distributor or far enough that
under normal conditions steam is fully absorbed.
3 Humidity Control - Can be Modulating or On/Off humidistat
o Can be located either in return air duct (preferred) or in room being humidified.
o Avoid placing near discharge diffuser of humidified air.
o Mount in area representative of room humidity (draft, doorways, sunlight, or
overhang such as a shelf can affect reading).
4 Outdoor Temperature Sensor (not shown)
o Mount outside in area representing air temperature.
Caution: Failure to wire the humidifier in accordance with the wiring instructions could
cause permanent damage. Such errors will void the warranty.