tekmar Control Systems Ltd

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System Description: The Mixing Reset Module 421 operates a single on-off boiler and 3-way mixing valve to provide outdoor reset to the heating system. The 3-way mixing valve allows the 421 to provide boiler protection from flue gas condensation. The 421's system pump output operates the boiler pump. Three tekmarNet®4 Thermostats operate three zone pumps through a Zone Expansion Module 326. Twelve tekmarNet®4 Thermostats operate two groups of six zone valves through two Zone Manager 335s. Each 335 uses its zone group pump output to operate a system pump in order to provide flow through its group of zones. A tekmarNet®4 mix bus interconnects the thermostats to the two 335s, the 326, and the 421. This allows the thermostats to communicate with the 421 in order to provide indoor feedback to fine tune the supply water temperature.

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System Description: The Universal Reset Module 422 operates a single on-off or modulating boiler to provide load reset to the two mix water systems and overrides the reset temperature to provide indirect domestic hot water tank heating. Priority for the indirect domestic hot water tank is optional. The 422 also operates a variable speed injection pump to provide outdoor reset to the mix 1 heating system and boiler protection from flue gas condensation. A Mixing Expansion Module 440 operates a variable speed injection pump for the mix 2 heating system. Eight tekmarNet®4 Thermostats operate eight mix 1 temperature zone pumps through a two Zone Manager 336s. A tekmarNet®4 mix 1 bus interconnects the thermostats to the 336's, and the 422. Twelve tekmarNet®4 Thermostats operate twelve mix 2 water temperature zone valves through a Zone Manager 335 and a Zone Expansion Module 325. A tekmarNet®4 mix 2 bus interconnects the thermostats to the 335, the 325, and the 422. The tekmarNet®4 bus allows the thermostats to provide indoor feedback to fine tune the supply water temperature.

For more sample tekmarNet®4 applications, download the A001 Brochure.