420
Discontinued - Replaced By: 423
Part of the Boiler and Mixing Controls Series
Ordering Code: 420
UPC: 779655042009
Boiler Reset Module, One tN4, Boiler, DHW and 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.
Features
- Outdoor temperature reset, indoor temperature feedback
- warm weather shut down, Zone Synchronization
- DHW Post Purge, System control for up to 24 zones
- Single on/off, or modulating boiler control, DHW control
- DHW priority (optional), setpoint operation
- automatic boiler differential, exercising
- Boiler protection, powered pump outputs
- System setback (with optional Timer)
- One touch overrides (with optional User Switch)
| Specifications | |
|---|---|
| Agency Approvals | CSA C US, meets Class B: ICES & FCC Part 15 |
| Ambient Conditions | Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), RH less than or equal to 80 percent to 88 degrees F (31 degrees C), down to 50 percent above 104 degrees F (40 degrees C), Altitude less than 6560 ft. (2000 m), Installation Category II, Pollution Degree |
| Boiler Relay | 115 V (ac) 5 A, 1/6 hp |
| Combined Load | 10 A max (for DHW and Primary Pump) |
| Control Type | Microprocessor control, this is not a safety (limit) control |
| Demand | 20 to 260 V (ac) / 0.1 VA at 24 V |
| DHW - Zone Valve | 24 V (ac) 8 VA max |
| Dimensions | 3 5/8 IN H x 5 3/8 IN W x 9/16 IN D (92 x 137 x 14 MM) |
| Enclosure Material | No Enclosure |
| Enclosure NEMA Rating | Does Not Apply To Product |
| Hydronic - HVAC Control Type | Boiler Reset Module |
| Modulating Output | 0-10 V (dc) minimum 2500 ohms |
| Power Supply | Provided by interconnected tekmarNet Zone Manager |
| Pump Relay | 115 V (ac) 5 A, 1/6 hp |
| Sensor | NTC thermistor, 10 k ohms at 77 degrees F (25 degrees C plus / minus 0.2 degrees C) Beta=3892 |
Literature
-
- Installation and Operation - 420 (Aug 2007 - Present)
- Job Record - 420 (Aug 2009 - Present)
- SB032 - Modulating Boiler Interface Revision 8
- SB054 - RF Noise Interference (May 2009 - Present)
- SB067 - Installing tN4 Reset Modules 420, 422 and 423 with Modulating Boilers (Mar 2011 - Present)
- SB089 - Installing tN4 Reset Modules 420, 422, and 423 with Modulating Boilers (Sep 2015 - Present)
- Specification Sheet - 420 (Jan 2011 - Present)
- Wiring Guide - 420 (Mar 2009 - Present)