Importance

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Abstract

An electrical control system for an absorption heat pump capable of conditioning a space by cooling or heating including: (a) a unit activation component 64a having an on and off position responsive to temperature in the space to be conditioned; (b) a mode selection switch 64e having a heating mode position and a cooling mode position; (c) safety switches 64c for sensing hazardous operating conditions; (d) a timer device 60 which is activated by the unit activation component 64a and the safety switches 64c and which, after a predetermined period of activation, turns an output 64 to an on position; (e) a first control circuit 68 for operating the outside fan 15a when the unit activation component 64a is in the on position; (f) a second control circuit 69 for operating the solution pump 30 when the timer output 64 is in the on position; (g) a third control circuit 70 for operating the second or chilled coolant pump 12p when the timer output 64 is in the on position; (h) a fourth control circuit 71 and 71' for moving a valve 14 to a heating position when the mode selection switch 64e is in the heating position and for moving the valve 14 to a cooling position when the mode selection switch 64c is in the cooling position; and (i) a fifth control circuit 72 for operating a heat source 42v associated with the heat pump generator 10 when the timer output 64 is in the on position, the unit activation component 64a is in the on position and the safety switches 64c sense no hazard. The dependence of some control circuits on the unit activation component and others on the timer output improves the safety and reliability of the heat pump.

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First Claim