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Part of the 422 Series

Ordering Code: 422

UPC: 779655042207

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


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  • DHW priority (optional), expandable up to 48 zones
  • Boiler protection, powered pump outputs
  • Warm weather shut down, zone synchronization
  • Single on/off or modulating boiler control, variable speed, or floating action mixing control
  • Outdoor temperature reset, indoor temperature feedback
  • System setback (with optional Timer)
  • One touch overrides (with optional User Switch)
  • Automatic boiler differential, Exercising
  • DHW post purge, DHW control
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), Max. RH 92 percent for temperatures up to 40 degrees C, 50 percent RH at greater than 40 degrees C, Altitude less than 6560 feet (2000 m), Installation Category II, Pollution Degree 2
Boiler Relay 115 V (ac) 5 A
Combined Load 10 A Max. (for DHW, Primary, Mixing & Var. Speed Pump)
Control Type Microprocessor PID control, this is not a safety (limit) control
Demand 20-260 V (ac) / 0.1 VA at 24 V
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
Floating Action Load 24 V (ac) 8 VA Maximum
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, 10k at 77 degrees F (25 degrees C plus / minus 0.2 degrees C) Beta=3892
Variable Pump 115 V (ac) 2.5 A, fuse T2.5 A 250 V