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  Tekmar Universal Reset Module - Two tN4, Mixing, Boiler, DHW & SP
Tekmar Universal Reset Module - Two tN4, Mixing, Boiler, DHW & SP
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Tekmar Universal Reset Module - Two tN4, Mixing, Boiler, DHW & SP

The Universal Reset Module 422 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 multiple fan coils, mixed radiant floor zones, and a modulating/condensing boiler. This control regulates up to two heating water temperatures through Outdoor Temperature Reset and Indoor Temperature Feedback. It is capable of controlling a single on/off, two stage, or modulating boiler, a mixing device, Domestic Hot Water, setpoint loads, and can expand up to 24 zones in total for each heating water temperature.


  • Automatic Boiler Differential
  • Boiler Protection
  • DHW Post Purge
  • DHW Priority (optional)
  • DHW control
  • Exercising
  • Expandable up to 48 zones
  • Indoor Temperature Feedback
  • One touch overrides (with optional User Switch)
  • Outdoor Temperature Reset
  • Powered pump outputs
  • Single on /off boiler control
  • System setback (with optional timer)
  • Variable speed, or floating action mixing control
  • Warm Weather Shut Down
  • Zone Synchronization


Control Microprocessor PID control; This is not a safety (limit) control
Packaged weight 1.87 lb. (848 g)
Dimensions 3-5/8" H x 5-3/8" W x 9/16" D (92 x 137 x 14 mm)
Approvals CSA C US, CSA/UL 61010-1, meets Class B: ICES & FCC Part 15
Ambient conditions Indoor use only, 32 to 122°F (0 to 50°C), Max. RH 92% for temperatures up to 40°C, 50% RH at > 40°C, Altitude <6560 feet (2000 m), Installation Category II, Pollution Degree 2
Power Supply Provided by interconnected tekmarNet Zone Manager
Pump relays 115 V (ac) 5 A, 1/6 hp
Boiler Relay 115 V (ac) 5 A
Variable pump 115 V (ac) 2.5 A, fuse T2.5 A 250 V
Combined Load 10 A Max. (for DHW, Primary, Mixing & Var. Speed Pump)
Floating Action Output 24 V (ac) 8 VA Maximum
Modulation Output 0-10 V (dc) Minimum 2500
Demands 20-260 V (ac) / 0.1 VA @ 24 V
Sensors NTC thermistor, 10k @ 77°F (25°C ± 0.2°C) ß=3892
-Included utdoor Sensor 070 and 2 Universal Sensors 082
Warranty Limited 3 Year Warranty

Current Literature

Product Submittal

Jan 2011 - Present


Installation & Operation Manual

Aug 2007 - Present


Job Record

Aug 2009 - Present


Wiring Brochure

Mar 2009 - Present


Installing tN4 Reset Modules 420, 422 and 423 with Modulating Boilers

Mar 2011 - Present


RF Noise Interference

May 2009 - Present


Part Number: 422

2 +$682.93

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