71
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 47
a
: Multiple Boiler W
iring Diagram w/T
ekmar 265 Control
Viii
. Electrical
(continued)
Summary of Contents for Apex APX399
Page 65: ...65 VIII Electrical continued Figure 43 Ladder Diagram ...
Page 66: ...66 VIII Electrical continued ...
Page 67: ...67 Figure 44 Wiring Connections Diagram VIII Electrical continued ...
Page 110: ...110 1P 3 1P 2 1P 1 XIII Repair Parts continued 1C 1D 1E ...
Page 116: ...116 XIII Repair Parts continued ...
Page 118: ...118 XIII Repair Parts continued ...
Page 129: ...129 SERVICE RECORD DATE SERVICE PERFORMED ...
Page 130: ...130 SERVICE RECORD DATE SERVICE PERFORMED ...