Robertshaw Controls Company

Dwain F Moore

Gregory J Momber

A fuel control system, parts therefor and methods of making and operating the same are provided, the fuel control system comprising an ignition unit for igniting fuel issuing from a burner, and a flame detecting unit for detecting flame at the burner, the flame detecting unit comprising a sensing device for receiving an electrical signal caused by flame rectification at the burner, and an output device for cycling the signal to the sensing device in an on and off manner in each cycle of operation of the output device, the control system having a modulating unit for modulating the on time and the off time of the output device in each cycle of operation thereof.

Fuel control system, parts therefor and methods of making and operating

A fuel control system, a control unit therefor and methods of making the same are provided, the system comprising a control unit that reduces the length of the warm-up time period of an igniter in subsequent successive burner cycles in which ignition is successful until the control device detects an increase in the length of the flame detecting time period in that particular successive burner cycle over the length of the flame detecting time period on a previous burner cycle at which time the control device then increases the length of the previously reduced warm-up time period a certain amount.

Fuel control system, control means therefor and methods of making the

A control system for controlling the operation of an air conditioning compressor and method of making the same are provided, the system comprising a thermostat switch and a high pressure switch arranged in series with a compressor switch across two sides of a power source whereby the thermostat switch and the high pressure switch must be in a closed condition thereof with the compressor switch also being in a closed condition before the compressor can be turned on, the system also comprising a low pressure switch that is arranged so as not to be in series with the other switches across the two sides of the power source and a microprocessor having means operatively associated with the low pressure switch to monitor the condition thereof.

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Holland, MI, United States of America

Dwain F Moore