Refer to the System 450 Series Modular Control Systems with Reset Control Modules Technical Bulletin (LIT-12011842), the System 450 Series Modular Controls Product Bulletin (LIT-12011458), and the installation instructions for product specifications, detailed installation procedures, and important product safety information
The C450RCN-x Reset Control Module enables you to keep the runtimes approximately equal on applications with redundant equipment. This example uses two similar cooling units with a space setpoint of 55°F. To attain equal runtimes on both cooling units, you must use the Reset function (rES) in conjunction with the balancing function (bAL).
In this example, Sensor 2 (Sn-2) is the space sensor. Sensor 1(Sn-1) must be installed, although the physical location of Sn-1 is not important in this example. The desired 55°F space temperature setpoint is attained by setting both the minimum setpoint (MNSP) and the maximum setpoint (MXSP) to 55°F. The control cycles the output relay (unit) with the fewest hours, keeping the runtime hours approximately equal.