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MANUALS (7)
Product Highlights
Description
The House Control 402 is designed to operate as part of a complete hydronic heating system with tekmarNet®2 (tN2) thermostats. It can provide operation of two outdoor reset water temperatures in addition to Domestic Hot Water and Setpoint capabilities. It is easy to add more zones, add schedules or other convenient accessories through the use of the tekmarNet®4 (tN4) Expansion terminals.
Features:
- Enclosure: O-Enclosure, blue PC+ABS UL94-5VA plastic
- Approvals: CSA C US, meets ICES & FCC regulations for EMI / RFI
- Ambient Conditions: Indoor use only, 32 to 104°F (0 to 40°C), RH 90% Non-condensing
- Power Supply: 24 V (ac) ±10% 60 Hz, 100 VA max, Class 2
- Control Load: 2 VA
- Zone Valve/Floating Action Load: d24 V (ac) 2 A, maximum combined current (zones 1 to 4): 89 VA (3.7 A)
- Boiler Relay: 24 V (ac) 5 A
- Boiler System Pump Relay: 115 V (ac) 5 A, 1/6 HP
- Mix System Pump Relay: 115 V (ac) 5 A, 1/6 HP
- DHW Pump Relay: 115 V (ac) 5 A, 1/6 HP
- Variable Speed Pump Relay: 115 V (ac) 5 A, 2.0 A
- Pump Power: 115 V (ac) 12 A max
- Setpoint and DHW Calls: Short, 0 - 32 V (ac)
- Boil/Mix Modulating Output: t0 - 10 V (dc), 3 kohm minimum load impedance
Specs
| Ambient Conditions: | Indoor use only 32 to 104°F < 90% RH non-condensing |
|---|---|
| Height (Inches): | 5.5" |
| Width: | 5-1/2" |
| Depth (Inches): | 2-1/4" |
| Enclosure Type: | NEMA-1 |
| Voltage: | 24V |
| Boiler Relay: | 24 V (ac) 5 A |
| Boiler System Pump Relay: | 115 V (ac) 5 A 1/6 HP |
| DHW Pump Relay: | 115 V (ac) 5 A 1/6 HP |
| Setpoint: | Short. 0 - 32 V (ac) |
| Output: | 0 - 10 V (dc) 3K ohms min load impedance |
| Weight (lbs): | 1.37 lbs |
| Power Supply: | 24V (ac) |
| Zone Valve Load: | max combined current (zones 1 to 4): 3.7 A 24 V (ac) 2 A |
| Sensors: | NTC Thermistor, 10 k ohm @ 77°F |
| Includes: | 070 Sensor (2) 082 Sensors |
| Pump Power: | 115 V (ac) 12 A max |
| Application: | HVAC |
| Type: | House Control |
Questions?
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Product Reviews
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tn2 not good for solar, poor service
Works great, easy to set up and operate
Great product, fun as a trip to dentist
TEKMAR 402
Product Q&A
1 QuestionQ: Can you install the 402 when you need more than one mix water temperature, I have slab, staple up and radiators, each would ideally have its own water temperature. Is there a device to add a second and third mixing valve? If not, what would work?
Asked by Tahoe 10 years ago
Add your answer
Verified Reply- SupplyHouse StaffFor multiple mix water temperatures it is recommended to use a 423 Universal Reset Module with attached Zone Manager ex. 335 or 336 (or 334 for 2 wire). You would then add up to three mixing devices known as Mixing Expansion Modules and come in various styles. Such as sku 440, 441, or 444.
The 402 can do all of that with additional components, more piping and design work. The 402 will run 4 boiler or mix zones. You will need at least one zone manager to do two temperatures. It can give you boiler reset - by connecting one or more TN2 thermostats to the boiler bus - using a separate 313 or 314 zone manager(s) for the high temp zones. You can have multiple mix temp zones by adding a 440, 441 or 444 mixing expansion module, which is wired into the mixing expansion terminals on the 402. You could use a thermostatic mix valve for fixed temp mixing for one of the mix zones. I often size my radiators so that I can use lower temp water which could allow the staple up and radiators to share the same water temp on the boiler Tekmar has many documents on their web site to help installers specify, design and install multi-level controls. Reading the entire installation manuals is the best way to sort out your options. Hiring a contractor who has had Tekmar training may be worth considering. Clayton Cole Solartechnic Contractors, Inc.