These modules can be used as a stand-alone or as expansion modules communicating with a VCCX2 Controller via a modular cable.
The Orion Controls product line allows the VCCX2 Controller to expand its features and capabilities by utilizing numerous application specific add-on modules.
The MODGAS-X and the MODGAS-XWR2 can modulate up to two gas valves to maintain a desired Discharge Air Temperature. It also controls the speed of the induced draft fan to maintain proper combustion in the heat exchanger. These modules can be used as stand-alone or in conjunction with the VCM-X E-BUS, VCB-X, or VCCX2 Controller using a modular cable.
Documentation