Tekmar 422 Universal Reset Module, Two tN4, Mixing, Boiler, DHW and Setpoint

The Universal Reset Module 422 is designed to operate all of the mechanical equipment in a hydronic heating system, except for zones, coordinating their operation through network communication. It can be used in applications ranging from a single zone of baseboard with an on/off boiler to multiple fan coils, mixed radiant floor zones, and a modulating/condensing boiler. This control regulates up to two heating water temperatures through Outdoor Temperature Reset and Indoor Temperature Feedback. It is capable of controlling a single on/off, two stage, or modulating boiler, a mixing device, Domestic Hot Water, setpoint loads, and can expand up to 24 zones in total for each heating water temperature. Features: Outdoor temperature reset, indoor temperature feedback Warm weather shut down, zone synchronization DHW post purge, DHW control DHW priority (optional), expandable up to 48 zones Single on/off or modulating boiler control, variable speed, or floating action mixing control Automatic boiler differential, Exercising Boiler protection, powered pump outputs System setback (with optional Timer) One touch overrides (with optional User Switch)