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Tekmar 264 Based Control System (or equal)
Sequence of Operation
The Tekmar 264 Control (or equal) can control up to four (4) boilers and an Indirect Water Heater by utilizing stage ring. When a call for heat is received
by the Tekmar 264 Control, the control will re either one or more boilers in sequential ring mode to establish a required reset water temperature in the
system supply main based on outdoor temperature. The boilers will modulate on their own based on each boiler’s MCBA Control and will target a setpoint
temperature to supply enough temperature to the system main to satisfy the desired reset water temperature in the main established by the T
ekmar 264
Control. When a call for Indirect Hot Water is generated to the Tekmar 264, the control will de-energize the zone pump control (ZC terminal), energize the
Indirect pump and sequentially re the boilers to establish a setpoint temperature in the main for the Indirect Heater using Priority. The Tekmar 264 Control will
disable the stage ring and post purge the Indirect Pump to reduce the temperature in the Supply Main near the end of the Indirect Mode to a point where it will
need to be when it changes back to Space Heating Mode. The Tekmar 264 Control also has the ability to rotate the lead-lag ring of the boilers to establish
equal operating time for each boiler stage.
Figure 45: Modular Wiring Diagram w/Tekmar 264 Control