Figure 1. Low Voltage Control Terminal Strip - Nortec NHPC Engineer's Manual

(11) A and B: Mount any wall humidistat (control or high limit) over a standard electrical box
at a height similar to a typical thermostat. Any wall humidistat should be in a location
representative of the overall space being humidified and not in the path of a blower pack
or an air supply grille.
(12) A: Mount any duct control humidistat in a location representative of the overall air
humidity, usually the return duct. Do not mount it directly in front of the steam distributor
or in a turbulent or mixing zone. Mount it where the air's humidity and temperature are
uniform and representative air is over-humidified or approaching saturation.
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2008-10-01

Figure 1. Low Voltage Control Terminal Strip