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Tekmar Universal Reset Module, Four tN4, Two Boiler, DHW and Setpoint

SKU: 423

$1,473.00 

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Product Details

Tekmar 423

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).


  • UPC 779655042306
  • Online Product ID 9574661
  • Width 5.38"
  • Height 3.63"
  • Depth 0.56"
  • Warranty 3 years Limited
  • Prop65 Warning Warning: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov
  • Ambient Temperature Range 32 to 122 degree F
  • Boiler Mix Modulating Output 0 - 10 VDC, 2500 Ohm Minimum Load
  • Combined Load 10 A Maximum (For DHW, Primary Pump)
  • Control Type Microprocessor PID
  • Demand Bus Demand 20 - 260 VAC, 0.1 VA at 24 V
  • Dhw Valve Output 24 VAC, 8 VA Maximum
  • Hydronic Hvac Control Type Universal Reset Module
  • Includes Outdoor Sensor 070, Universal Sensor 082
  • Indoor Outdoor Indoor
  • Relative Humidity 80 percent to 88 degree F (31 degree C), down to 50 percent from 104 to 122 degree F
  • Relay DHW Pump, Primary Pump Relay: 115 VAC, 5 A, 1/6 hp, Boiler Relay: 115 VAC, 5 A
  • Safetylist CSA C US, CSA/UL 61010-1, Meets Class B: ICES and FCC Part 15
  • Sensor NTC Thermistor, 10 kOhm at 77 degree F (25 degree C plus /- 0.2 degree C) Beta = 3892
  • Suitable For Use With tekmarNet 4 Thermostats
  • Shipping  1.83 lbs.

Additional information

  • DHW priority (optional), setpoint operation
  • Expandable up to 96 zones, two on-off or two modulating boiler control
  • DHW post purge, DHW control
  • Powered pump outputs, system setback (with optional timer)
  • Controls up to 4 water temperatures (with use of up to 3 mix expansion modules), automatic boiler differential
  • One touch overrides (with optional user switch)
  • Outdoor temperature reset, indoor temperature feedback
  • Exercising, boiler protection
  • Warm weather shut down, zone synchronization

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