Specifications
Installation & Maintenance Manual   
 40 
14.2.  HC-101 and HC-201 Wall and Duct Humidistats 
Mounting the HC-101 room humidistat: Mount 
the HC-101 humidistat to an inside wall or post in 
the area to be humidified. Position it so that no 
drafts from registers or outlets are blowing on it. 
Be sure that it is not placed over a device that 
could generate heat or vapor ie: stove, 
machinery, cleaning vat. The unit has three wire 
leads, Orange, Brown and Red. Use the Orange 
and Brown leads for control operation. Use the 
Orange and Red leads for hi-limit operation. 
Mounting the HC-201 duct humidistat: Cut a hole in the side of the duct and mount the HC-201 humidistat to the 
duct, using the screws provided, at least 6 feet down stream of any live steam or mist. The unit has three wire leads, 
Orange, Brown and Red. Use the Orange and Brown leads for hi-limit operation. 
 Wiring Diagram 
TABLE 1. SPECIFICATIONS 
Part 
No. 
Type Scale 
Range 
%RH 
Diff. 
%RH 
Operating
Limits 
°F (°C) 
Shipping 
& Storage
°F (°C) 
Connection Cover  Dimensions 
In. (mm) 
HC-101 
Wall  10 to 90  5  40 to 125 
(4 to 2) 
-40 to 140 
(-40 to 60) 
6" (150 mm) 
color coded 
leads 
Beige 
plastic 
4-3/8 x 2-7/8 x 1-5/8 
(111 x 73 x 41) 
HC-201 
Duct  15 to 95  5  40 to 125 
(4 to 2) 
-40 to 140 
(-40 to 60) 
Coded 
screw 
terminals 
Metal  4-3/4 x 6-1/2 x 2-1/4 
(121 x 165 x 57) 
TABLE 2. MAXIMUM ELECTRICAL RATINGS 
Part No.  AC Volt 
50/60 Hz 
FLA LRA Resistive 
Amps 
Pilot Duty 
VA 
24 -  -  8 60 
120 7.2 43.2  8  345 
HC-101 
HC-201 
240 3.6 21.6  8  345 
 Brown (N.O.) 
Red (N.C.) 
Brown makes on      Drop in R.H. 
drop in humidity 
 Orange 
 Common 










