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Part of the 423 Series

Ordering Code: 423

UPC: 779655042306

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


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  • 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
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" H x 5-3/8" W x 9/16" 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