| 摘要 |
A heating system (10) has a pump control unit (11) incorporating a timer (12), a microprocessor (13) and RAM storage (14), so that pump (6) is off when there is no call for burner operation without any need to monitor the water temperature in system (10); in this way, the overall power used is reduced. In order to achieve these features, pump control (11) measures the length of time during which the burner unit is in an off/low ignition mode for the first occasion after turn-on of the system; when the burner unit is next in an off/low ignition mode, pump control unit (11) maintains the pump off for that amount of time and also notes the time between the subsequent turn-on pump (6) and of the burner unit (3), thereby to modify the next turn-off period of pump (6).
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