Cold water draw bypass valve and variable firing boiler control
US6694927B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2003 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Feb 18, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2225/19
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A first sensor provides a demand for heat signal to a condensing boiler or water heater for control of the variable firing rate. A second sensor controls a bypass valve to allow a portion of water leaving the primary heat exchanger to reenter the primary heat exchanger. The bypass valve is controlled to maintain the temperature of water entering the primary heat exchanger above a minimum. When the boiler is operating at a reduced firing rate based on the demand for heat and an increase in firing rate is needed to maintain the temperature of water entering the primary heat exchanger above the minimum, the variable firing rate is increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.