Restricted intake compensation method for a two stage furnace
Patent
·
OSTI ID:5551425
This patent describes restricted intake compensation method for a two stage furnace. The furnace comprises: a plenum, a gas burner, a gas valve having a low and high combustion operating setting, and an inducer fan having a low and high speed operating setting, a method of compensating for a restricted intake condition. It comprises: providing a low and high pressure switch for determining if the air pressure inside the plenum indicates sufficient air is present for the gas burner to support low and high combustion, respectively; operating the furnace at high combustion when high heat is enabled by operating the inducer fan at the high speed setting; determining the state of the high pressure switch during high combustion including timing the duration of the state changes of the high pressure switch; switching the inducer fan to the low speed setting when the high pressure switch has indicated that insufficient air was present to support high combustion for a predetermined time period; determining the state of the low pressure switch during low combustion; switching the inducer fan to the high speed setting when the low pressure switch indicates that insufficient air is present to support low combustion.
- Assignee:
- Inter-City Products Corp., Lavergne, TX (USA)
- Patent Number(s):
- A; US 4982721
- Application Number:
- PPN: US 7-477743
- OSTI ID:
- 5551425
- Country of Publication:
- United States
- Language:
- English
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