63
Tekmar 265 Based Control System (or equal)
Sequence of Operation
The
Tekmar 265 Control (or equal) can control up to three (3) boilers and an Indirect W
ater Heater
. When a call for heat is received by the
Tekmar 265 Control, the control
will fire either one or more boilers in either parallel or sequential firing mode to establish a required reset water temperature in the system supply main based on outdoor temperature.
The boilers will modulate based on an
Analog communication signal established between the
Tekmar 265 Control and each boiler
’s Sage2.1™ Control.
The
boiler(s) and system supply water temperature will be reset together to maintain the input that is needed to the system. When a call for Indirect Hot W
ater is generated to the
Tekmar 265, the control will de-energize the zone pump control (ZC terminal), energize the Indirect pump and modulate the boiler firing to establish a setpoint temperature in the main for the Indirect Heater using Priority
.
The
Tekmar 265 also controls each boiler
’s pump and a post purge of leftover temperature in the boilers will occur at the end of the
call for Indirect Hot W
ater
.
Figure 30A: Multiple Boiler W
iring Diagram w/T
ekmar 265 Control
VIII. Electrical
(continued)
Summary of Contents for APEX
Page 57: ...57 VIII Electrical continued Figure 26 Ladder Diagram ...
Page 58: ...58 VIII Electrical continued ...
Page 59: ...59 Figure 27 Wiring Connections Diagram VIII Electrical continued ...
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Page 109: ...109 XIII Repair Parts continued APX625 APX725 and APX825 APX825 shown ...
Page 112: ...112 XIII Repair Parts continued APX425 and APX525 ...
Page 114: ...114 XIII Repair Parts continued APX625 APX725 and APX825 ...
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