059705–00 REV. B
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13
03
STEAM HEATING
SEQUENCE OF BURNER/VALVE OPERATION
•
The Genesis Heat-Timer
®
will turn on the boiler or open the steam valve when the outside temperature falls below the outdoor
sensor cutoff (factory set at 55°F for Day and 55°F for Night, but fully adjustable).
•
The Genesis Heat-Timer
®
will continue to call for heat, keeping the steam source active, until the heating system sensor reaches
its adjustable Set Point. This indicates that steam has gotten entirely through the system, or that "heat is established".
•
Once "heat is established", the Cycle-ON segment of the cycle will begin.
•
During the Cycle-ON period, the Genesis Heat-Timer
®
will keep the steam source activated. The length of the ON part of the
cycle is dependent on the outdoor temperature and the Day/Night setting.
•
Once the Cycle-ON part has ended, the Cycle-OFF part of the cycle will begin. The Genesis Heat-Timer
®
will turn off the boiler or
close the steam valve for the remainder of this cycle.
•
When the Cycle-OFF part is over, the Genesis Heat-Timer
®
will once again activate the steam source unless either the outside
temperature has risen above the cutoff, or the thermal lockout is active, or Space Lockout is active.
•
With the thermal lockout, the heating system sensor temperature must fall below the Set Point through an adjustable differential
before the heating source can be reactivated. This allows residual heat in the pipes to continue to heat the building. Once the
pipes have cooled sufficiently, a new cycle can begin.
•
The Genesis Heat-Timer
®
control checks for Space Lockout and adjusts the heat setting as needed before staring another cycle.
SEQUENCE OF DISTRICT STEAM OPERATION
•
The Genesis Heat-Timer
®
will open the steam valve when the outside temperature falls below the outdoor sensor cutoff (factory
set at 55°F for Day and 55°F for Night, but fully adjustable).
•
The Genesis Heat-Timer
®
will continue to call for heat, keeping the steam source active, until the District Steam Delay period has
timed out. This District Steam Delay period should be long enough to ensure steam has gotten entirely through the system, or
that "heat is established".
•
Once "heat is established", the Cycle-ON segment of the cycle will begin.
•
During the Cycle-ON period, the Genesis Heat-Timer
®
will keep the steam valve open The length of the ON part of the cycle is
dependent on the outdoor temperature and the Day/Night setting.
•
Once the Cycle-ON part has ended, the Cycle-OFF part of the cycle will begin. The Genesis Heat-Timer
®
will close the steam
valve for the remainder of this cycle.
•
When the Cycle-OFF part is over, the Genesis Heat-Timer
®
will once again open the steam valve unless either the outside
temperature has risen above the cutoff, or Space Lockout is active.
•
The Genesis Heat-Timer
®
control checks for Space Lockout and adjusts the heat setting as needed before staring another cycle.
NOTE
The Thermal Lockout feature is not available when using the District Steam heating mode.
