Figure 13: “RSAL” Wiring Less Tankless, Single Circulator
Sequence of Operation
A call for heat by the thermostat energizes the L7224C/L7248C control which in turn energizes the Honeywell R4184D primary control to turn on the burner. If burner ignites within approximately 45 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 high limit is reached. The circulator will operate as long as the thermostat is calling for heat. If the thermo- stat is not satisfied and the high limit is reached, the circulator will continue to operate, and the burner will stop until the high limit is closed by a drop in water temperature.
Figure 14: “RSAT” or “RSAR” Wiring with Tankless, Single Circulator
Sequence of Operation
A call for heat by the thermostat energizes the L7224C/L7248C control which in turn energizes the Honeywell R4184D primary control to turn on the burner. If burner ignites within approximately 45 seconds and the cad cell sees flame the burner will continue to operate until the call for heat is satisfied. The circulator will also operate when the thermostat calls for heat if the boiler water temperature is up to the setting of the low limit in the L8124C control. If boiler water temperature is below the low limit setting the burner will operate but the circulator will not, giving preference to the domestic hot water demand.
On call for heat by the thermostat the burner will continue to operate until the thermostat is satisfied or the setting of the high limit is reached. If the thermostat is not satisfied when the high limit is reached the burner will stop but the circulator will continue to operate until the thermostat is satisfied. Any time the boiler water temperature drops below the setting of the low limit the burner will be energized in order to maintain domes-
tic water temperature. | 21 |
