402 | tN2 House Control - Boiler, DHW & Setpoint, Mixing, Four Zone Valves | Tekmar
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Tekmar 402 Documents
Overview
Details for 402
tN2 House Control - Boiler, DHW & Setpoint, Mixing, Four Zone Valves
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
Specifications
| Item Number | 402 |
| Brand | Tekmar |
| Category | tekmarNet Controls |
| 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 |
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