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.
Features
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
Product Submittal 
