5
Figure
B: Modular W
iring Diagram w/T
ekmar 26
Control
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 W
ater Heater by utilizing stage firing. When a call for heat is received by the
Tekmar 264
Control, the control will fire either one or more boilers in sequential firing 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 Sage2.1™ Control and will target a setpoint temperature to supply enough input to the system main
to satisfy the desired reset water temperature in the main established by the
Tekmar 264 Control. When a call for Indirect Hot W
ater is generated to the
Tekmar 264, the control
will de-energize the zone pump control (ZC terminal), energize the Indirect pump and sequentially fire the boilers to establish a setpoint temperature in the main for the Indirect Heater using Priority
.
The
Tekmar 264 Control will disable the stage firing 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 firing of the
boilers to establish equal operating time for each boiler stage.
X. Modular
installation (continued)
Summary of Contents for Alpine ALP080
Page 40: ...40 Figure 29 Condensate Trap and Drain Line V Condensate Disposal continued ...
Page 56: ...56 VIII Electrical continued ...
Page 57: ...57 VIII Electrical continued Figure 35 Wiring Connections Diagram ...
Page 58: ...58 Figure 36 Ladder Diagram VIII Electrical continued ...
Page 64: ...64 Figure 39 Modular Boiler Direct Vent Termination X Modular Installation continued ...
Page 65: ...65 Figure 40 Modular Boiler Concentric Vent Termination X Modular Installation continued ...
