Abstract First and second wafer switches are provided in a housing. Each of the switches has a control member outside the housing for manual operation and a plurality of electrical contacts inside the housing. Selected contacts of the first wafer switch are electrically connected to a cable for independent electrical connection to first and second stage cooling lines, a fan, a source of voltage and first and second stage heating lines. Selected contacts of the second wafer switch are electrically connected to a pair of test leads and are electrically connected to a cable for independent electrical connection to defrost checking circuits. Selected contacts of the first and second wafer switches are connected to each other. A user substitutes thermostatic operation by selective operation of the control members of the first and second wafer switches after connection of the leads and the leads of the cables to the corresponding lines and circuits.
A thermostat substitution circuit device for substituting for a thermostat in testing of heating and cooling system circuitry, said thermostat substitution circuit device comprising a housing; and first and second wafer switches in the housing, each having a control member outside the housing for manual operation and a plurality of electrical contacts inside the housing, selected contacts of the first wafer switch being electrically connected to a cable for independent electrical connection to first and second stage cooling lines, a fan, a source of voltage and first and second stage heating lines, selected contacts of the second wafer switch being electrically connected to a pair of test leads and being electrically connected to a cable for independent electrical connection to defrost checking circuits, selected contacts of the first and second wafer switches being connected to each other whereby a user substitutes thermostatic operation by selective operation of the control members of the first and second wafer switches after connection of the leads and the leads of the cables to the corresponding lines and circuits.
Claim 2
Dependent Claim
174 words
A thermostat substitution circuit device for substituting for a thermostat in testing of heating and cooling system circuitry, said thermostat substitution circuit device comprising a housing; and first and second wafer switches in the housing, each having a control member outside the housing for manual operation and a plurality of electrical contacts inside the housing, selected contacts of the first wafer switch being electrically connected to a cable for independent electrical connection to first and second stage cooling lines, a fan, a source of voltage and first and second stage heating lines, selected contacts of the second wafer switch being electrically connected to a pair of test leads and being electrically connected to a cable for independent electrical connection to defrost checking circuits, selected contacts of the first and second wafer switches being connected to each other whereby a user substitutes thermostatic operation by selective operation of the control members of the first and second wafer switches after connection of the leads and the leads of the cables to the corresponding lines and circuits.