Abstract: A method of monitoring and controlling a well pump apparatus having an electric motor that rotates a crank arm having a counterweight thereon, a pivoted walking beam oscillated by the crank arm which reciprocates a sucker rod and a pump between an upstroke and a downstroke. The electric current from the motor is measured periodically between the peak upstroke motor current and the peak downstroke motor current, and the results are then integrated to deduce an analysis current per stroke. The mean of a number of sequential samples of the analysis current per period is calculated and thereafter the standard deviation is calculated. The last sample will be within two standard deviations of the mean or the results will be discarded and new data gathered. The well pump apparatus is stopped if a selected number of consecutive samples fall below a preselected threshold.

Abstract: A method of monitoring and controlling a pumped well having a rod string extending from a pumping unit located at the earth's surface to a subterranean pump, the rod string being sequentially reciprocated through up and down strokes and the well producing pumped fluid through a collection pipe, the method includes measuring the displacement and the load on the rod string, determining the well is pumped-off when fluid flow from the well substantially stops, recording the maximum load on the sucker rod string during pumped-off conditions, the load being measured during a selected portion of the first portion of the rod string downstroke, establishing a target pumped-off load as a selected percentage of the measured load, periodically initiating a pumping cycle, terminating each pumping cycling when the rod load equals the target rod load.

Abstract: A microcomputer controlled digital thermostat has separate, independent registers for storing heating control information and cooling control information. On a periodic basis, the microcomputer determines whether the furnace should be turned on, based upon a temperature signal indicative of room temperature, a time-of-day value indicative of the present time of day, and the stored heating control information. If the furnace is already off and the microcomputer determines that it should remain off, the microcomputer then determines whether air conditioning is needed, based upon the temperature signal, the time-of-day value, and the stored cooling control information.

Abstract: A microcomputer controlled digital thermostat has a two-digit display which normally displays room temperature and a plurality of function and temperature keys for storing control information in the microcomputer. The function keys include a TIME SET key, a HEAT SET key, an AC SET key, and an AC OFF key. The temperature keys include keys for each of a plurality of temperature ranges such as 59.degree.-59.degree. F., 60.degree.-69.degree. F., and 80.degree.-89.degree. F. Time and temperature settings are entered and stored in registers of the microcomputer by a slew entry arrangement through use of the function keys and temperature keys, together with the display. Recall of the stored settings is provided by rapidly contacting the function keys.