CLEAN BURN CB-200-CTB, Руководство оператора, Страница: 144 / 148

Coil Tube Boiler Operator's Manual: Models CB-200-CTB, CB-350-CTB and CB-500-CTB
B-4
The CTB sequence of operation is summarized as follows:
(1) A call for heat by the thermostat energizes the DPDT relay which in turn energizes the
circulator delay relay and the boiler loop circulator to establish a flow of water through the
coil.
(2) The low water cut-off "proves" the water level inside the boiler and allows the flow switch to
close. The power then continues from the flow switch through the high limit aquastat,
through the operating aquastat, and then to the burner.
(3) If the burner ignites within approximately 15 seconds and the cad cell sees flame, the burner
will continue to operate until the call for heat is satisfied or the setting of the operating
aquastat is reached.
(4) If the thermostat is not satisfied, but the temperature setting of the operating aquastat is
reached, the burner will stop until the return water drops the water temperature in the boiler
(re-closing the operating aquastat and turning the burner back on).
(5) The boiler loop circulator will operate as long as the thermostat is calling for heat.
(6) The boiler loop circulator circuit includes a delay relay that keeps the circulator operating
approximately ten minutes after the call for heat is satisfied.