402

Specifications

Agency Approvals	CSA C US, meets class B: ICES & FCC Part 15
Ambient Conditions	Indoor use only, 32 to 104 degrees F (0 to 40 degrees C), RH less than or equal to 90 percent Non-condensing
Boiler Stage1 Stage2 Relay	24 V (ac) 5 A
Calls	Setpoint and DHW calls, Short, 0 - 32 V (ac)
Control Load	2 VA
Control Type	Microprocessor control, this is not a safety (limit) control
Dimensions	5.5" H x 5.5" W x 2.25" D (140 x 140 x 57 mm)
Enclosure Material	Blue PC+ABS plastic
Enclosure NEMA Rating	NEMA 1
Hydronic - HVAC Control Type	tN2 House Control
Modulating Output	Boiler modulation 0 - 10 V (dc) 500 ohms min load impedance, 4 - 20 mA 1 k ohms max load impedance
Power Supply	24 V (ac) plus / minus 10 percent, 60 Hz, 100 VA max, Class 2
Pump Power	115 V (ac) 12 A max
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
Variable Pump	115 V (ac) 2.4 A
Zone Valve - Floating Action Load	89 VA, 24 V (ac), 3.7 A for zones 1 to 4 plus floating action output

The tekmarNet 2 House Control 402 is designed to operate all the mechanical equipment in a residential hydronic heating system, 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 heating 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, 4 on-board zone valves, and can expand up to 24 zones in total for each space heating water temperature.

Features

• DHW priority (optional), setpoint operation

• Exercising, Boiler Protection

• DHW post purge, DHW control

• Outdoor temperature reset, indoor temperature feedback

• Expandable up to 48 zones, single on/off, two stage, or modulating boiler control

• Variable speed, floating action, or proportional mixing control, automatic boiler differential

• Warm weather shut down, zone synchronization

• Only requires 2 Wires Per Zone, Four 24 V (ac) powered zone outputs

• For use with tekmarNet 2 thermostats only, tN4 expansion terminals

Tekmar 402 Quick Setup Guide

Tekmar Lower the Cost of Heating with a tekmar House Control System Brochure

Tekmar 402 Submittal

Tekmar 402 Manual