423

Product Image - 423
Product Image - 423
Product Image - 423
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Part of the Boiler and Mixing Controls Series

Ordering Code: 423

UPC: 779655042306

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)
Specifications
Agency Approvals CSA C US, CSA/UL 61010-1, meets Class B: ICES & FCC Part 15
Ambient Conditions Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), RH 80 percent to 88 degrees F (31 degrees C), down to 50 percent from 104 to 122 degrees F (40 to 50 degrees C), Altitude less than 6560 feet (2000 m), Installation Category II, Pollution
Boiler Relay 115 V (ac) 5 A
Combined Load 10 A Maximum (for DHW and Primary Pump)
Control Type Microprocessor PID control, this is not a safety (limit) control
Demand 20-260 V (ac) / 0.1 VA at 24 V
DHW - Valve Output 24 V (ac) 8 VA Maximum
Dimensions 3 5/8 IN H x 5 3/8 IN W x 9/16 IN D (92 x 137 x 14 MM)
Enclosure Material Does Not Apply To Product
Enclosure NEMA Rating Does Not Apply To Product
Hydronic - HVAC Control Type Universal Reset Module
Modulating Output 0-10 V (dc) Minimum 2500
Power Supply Provided by interconnected tekmarNet Zone Manager
Pump Relay 115 V (ac) 5 A, 1/6 hp
Sensor NTC thermistor, 10 k at 77 degrees F (25 degrees C plus / minus 0.2 degrees C) Beta = 3892

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