White Rodgers Hydronic Controls 7521

White Rodgers 7521

Automatic Change-Over Switch For Use With 1/2" Tubing. Epoxy resin seal protects bimetallic disc and Snap-Action contacts from dust, dirt
and corrosion. Furnished with removable spring clip to attach control to tubing. SPDT switch connects heating side of thermostat to two-wire zone valve when hot water is circulated through tubing. SPDT switch connects cooling side of thermostat to two-wire zone valve when
chilled water is circulated through tubing. Curved sensing element provides maximum contact with tubing.

Electrical Connections 12” red, brown and black leads, 105°C insulated, No. 18 wire
Temperature Settings Red-Black: open on rise @ 85°F, close @ 70°F
Red-Brown: close on rise @ 85°F, open @ 70°F
Ambient Temperature 221°F maximum