Oil burner control for hydronic system
A control is described for an oil burner heated boiler connected to a hydronic system having a circulator, including: oil burner control means having a step-down transformer and connection means for powering the oil burner control means and adapted to be controlled by a thermostat; the burner control means further includes relay means having normally open relay contacts with the contacts being operated to a closed state in response to the operation of the thermostat; a first of the relay contacts latching the relay means into an operated state upon operation of the thermostat; boiler water temperature limit control means having a high temperature limit switch that open circuits upon the water in the boiler reaching an upper temperature limit; the limit control means including a further switch means that closes when the high temperature limit switch opens; the high temperature limit switch including connection means connecting the oil burner control means, the oil burner, and a second normally open relay contact of the relay means in a first circuit means which is adapted to be connected to a line voltage source to energize the oil burner and the oil burner control means when the water in the boiler is below the upper temperature limit; and circulator energizing means including a second circuit means adapted to connect the circulator to the line voltage source through the further switch means when the further switch means closes to cause the circulator to operate when the high temperature limit switch is open circuited.
- Assignee:
- Honeywell Inc., Minneapolis, MN
- Patent Number(s):
- US 4690324
- OSTI ID:
- 5911961
- Country of Publication:
- United States
- Language:
- English
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