The A19 Series Changeover is a control for use with combination heating and cooling thermostats. This control automatically selects the correct thermostat function. Recommended for convectors, fan coils, and blast coil units, and similar devices. The A19CAC‑2 Control can be mounted directly on either a vertical or a horizontal pipe, using the can mounting strap supplied with control. The A19CAC‑1 Control has a remote bulb for greater mounting convenience.