HVAC Systems Icon

Universal Reset Module 423 - Four tN4, Two Boiler, DHW & Setpoint

The Universal Reset Module 423 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 four temperature systems comprised of multiple fan coils, baseboard, mixed radiant floor zones, and two modulating/condensing boilers. This control regulates up to four space heating water temperatures through Outdoor Temperature Reset and Indoor Temperature Feedback. It is capable of controlling two on/off or modulating boilers, Domestic Hot Water, setpoint loads, and can expand up to 24 zones for each space heating water temperature (96 in total).

How do I purchase this product?

Contact your Local Representative for details.

Features & Specs

Features (definitions)

Automatic Boiler Differential
Boiler Protection
Controls up to 4 water temperatures (with use of up to 3 mix expansion modules)
DHW Post Purge
DHW Priority (optional)
DHW control
Exercising
Expandable up to 96 zones
Indoor Temperature Feedback
One touch overrides (with optional User Switch)
Outdoor Temperature Reset
Powered pump outputs
Setpoint operation
System Setback (with optional Timer)
Two on/off or two modulating boiler control
Warm Weather Shut Down
Zone Synchronization

Specifications

Control	Microprocessor PID control; This is not a safety (limit) control
Packaged weight	1.83 lb. (830 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), RH 80% to 88°F (31°C), down to 50% from 104 to 122°F (40 to 50°C), Altitude <6560 feet (2000 m), Installation Category II, Pollution
Power supply	Provided by interconnected tekmarNet Zone Manager
Pump relays	115 V (ac) 5 A, 1/6 hp
Combined load	10 A Maximum (for DHW and Primary Pump)
DHW valve output	24 V (ac) 8 VA Maximum
Modulation output	0-10 V (dc) Minimum 2500
Boiler relay	115 V (ac) 5 A
Demands	20-260 V (ac) / 0.1 VA @ 24 V
Sensors	NTC thermistor, 10 k @ 77°F (25°C ± 0.2°C) ß = 3892
-Included	Outdoor Sensor 070 and Universal Sensor 082
-Optional	tekmar type#: 078
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	423_C
Installation & Operation Manual	Aug 2007 - Present	423_D
Job Record	Aug 2009 - Present	423_J
Wiring Brochure	Mar 2009 - Present	423_W

Service Bulletins