| 摘要 |
CONTROL SYSTEM FOR A FURNACE OPERATING IN THE CONTINUOUS BLOWER MODE A furnace having the capability of operating its blower continuously is provided for means for automatically shutting off the blower at the beginning of a heating cycle and resuming the operation thereof only after a predetermined time to allow the heat exchanger to heat up to a temperature that exceeds the dew point of the flue gas, to thereby reduce the occurrence of cold spot corrosion in the heat exchanger. Provision is also made, in a two speed blower system, for operating at a lower speed during continuous mode and heating cycle operation, and for operating at the higher speed during the heating cycles. |
