This control is designed for convectors, fan coils, blast coil units, and similar devices. The A19CAC-2 control can mount directly on either a vertical or a horizontal pipe, using the mounting strap supplied with the control. The A19CAC-1 control has a remote bulb for greater mounting convenience.
Figure 1. A19 Series switch action
Note: On a temperature increase above the set point, the circuit from red to blue
(RB) opens, and simultaneously red to yellow (RY) closes.