Boiler Reset Module 420 - One tN4, Boiler, DHW & Setpoint
The Boiler Reset Module 420 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 radiant floor zones with a modulating/condensing boiler. This control regulates one space heating water temperature through Outdoor Temperature Reset and Indoor Temperature Feedback. It is capable of controlling a single on/off or modulating boiler, Domestic Hot Water, setpoint loads, and can expand up to 24 zones in total.
How do I purchase this product?
Contact your Local Representative for details.- Features & Specs
Features (definitions)
Automatic Boiler Differential
Boiler Protection
DHW Post Purge
DHW Priority (optional)
DHW control
Exercising
Indoor Temperature Feedback
One touch overrides (with optional User Switch)
Outdoor Temperature Reset
Powered pump outputs
Setpoint operation
Single on/off, or modulating boiler control
System Setback (with optional Timer)
System control for up to 24 zones
Warm Weather Shut Down
Zone Synchronization
Specifications
Control Microprocessor control. This is not a safety (limit) control Packaged weight 1.6 lb. (730 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, meets Class B: ICES & FCC Part 15 Ambient conditions Indoor use only, 32 to 122°F (0 to 50°C), RH ≤80% to 88°F (31°C), down to 50% above 104°F (40°C), Altitude <6560 ft. (2000 m), Installation Category II, Pollution Degree Power supply Provided by interconnected tekmarNet Zone Manager Pump relays 115 V (ac) 5 A, 1/6 hp Combined load 10 A max (for DHW and Primary Pump) DHW zone valve 24 V (ac) 8 VA max Modulation output 0-10 V (dc) minimum 2500 Ω Boiler relay 115 V (ac) 5 A, 1/6 hp Demands 20 to 260 V (ac) / 0.1 VA @ 24 V Sensors NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 -Included Outdoor Sensor 070 and Universal Sensor 082 Warranty Limited 3 Year Warranty - Technical
In most cases the current version of literature will work, otherwise use the piece of literature most closely matching the date code of your product.
Current Literature
Product Submittal
Jan 2011 - Present
Installation & Operation Manual
Aug 2007 - Present
Job Record
Aug 2009 - Present
Wiring Brochure
Mar 2009 - Present
- Service Bulletins
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Active Service Bulletins
Installing tN4 Reset Modules 420, 422 and 423 with Modulating Boilers
Mar 2011 - Present
RF Noise Interference
May 2009 - Present
Archived Service Bulletins
Modulating Boiler Interface Revision 8
Mar 2011 - Mar 2011 (Updated March 2011)
tekmar Accessory Products (8 total)
These are typical products that add more functionality to the Boiler Reset Module 420
