Tekmar 423 Universal Reset Module, Four tN4, Two Boiler, DHW and Setpoint
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The Universal Reset Module 423 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 four temperature systems comprised of multiple fan coils, baseboard, mixed radiant floor zones, and two modulating/condensing boilers. This control regulates up to four space heating water temperatures through Outdoor Temperature Reset and Indoor Temperature Feedback. It is capable of controlling two on/off or modulating boilers, Domestic Hot Water, setpoint loads, and can expand up to 24 zones for each space heating water temperature (96 in total).
Features:
Outdoor temperature reset, indoor temperature feedback
Warm weather shut down, zone synchronization
DHW post purge, DHW control
DHW priority (optional), setpoint operation
Expandable up to 96 zones, two on/off or two modulating boiler control
Controls up to 4 water temperatures (with use of up to 3 mix expansion modules), automatic boiler differential
Exercising, boiler protection
Powered pump outputs, system setback (with optional timer)
One touch overrides (with optional User Switch)