Control circuit for heating and cooling apparatus

Claim 2

A control circuitry for controlling the operation, from a pair of power supply lines, of a multiple-speed fan for circulating enclosure air in a combination refrigeration cooling and electrical heating system in which the heating component includes first and second electrical resistance heaters comprising: a multiple-switch relay including a relay coil and a plurality of switch means for selecting the operating speed of said fan and movable from a first position to a second fan speed control position upon energization of said coil; a thermostat including first temperature-responsive switch means having a cooling contact and a high-heat contact connected to said second resistance heater and a second temperatureresponsive switch means having a low-heat or cooling contact connected to said first resistance heater; manually-operated, multiple-switch means having a cooling and a heating position and including a heater switch and a cooling switch interconnected for alternative closing of said heater switch or said cooling switch; circuits for connecting said resistance heaters and relay coil to said power lines comprising a first heater circuit including said low-heat contact, said first heater and said heater switch in series connection, a second heater circuit including said high-heat contact, said second resistance heater and said heater switch in series connection, a first relay coil circuit including said high-heat contact and said relay coil in series, a second relay coil circuit series connecting said low-heat contact, first resistance heater, second resistance heater and said coil for energizing said relay coil when said heater switch is open.

Claim 3

Control circuitry according to claim 1 including switch means for continuously operating said fan.

Claim 4

Control circuitry according to claim 1 in which said system includes both an enclosure air fan and an outdoor fan and said relay also includes switch means controlling the speed of the outdoor fan.

Claim 5

A control circuitry for controlling the operation, from a pair of power supply lines, of a multiple-speed fan for circulating enclosure air in a combination refrigeration cooling and electrical heating system including first and second electrical resistance heaters comprising: a multiple-pole, double-throw relay including a relay coil and a switch means for selectively controlling the operating speed of said fan and movable from a first fan-speed position to a second fan-speed position upon energization of said coil; a thermostat including first temperature-responsive switch means having a cooling contact and a high-heat contact connected to said second resistance heater and a second temperature-responsive switch means having a moderate termperature contact connected to said first resistance heater; a gang switch having a cooling and a heating position and including first and second heater switches and cooling switches interconnected for alternative closing of said heater switches or said cooling switch, said first heater switch in the heating position connecting said relay heating switch means to said thermostat moderate temperature contact and said second heater switch connecting both of said heaters in parallel to one of said supply lines, said cooling switch connecting said thermostat cooling contact to said relay cooling switch means; circuits for connecting said resistance heaters and relay coil to said power lines comprising a first heater circuit including said low-heat contact, said first heater and said first heater switch in series connection, a second heater circuit including said high-heat contact, said second resistance heater and said first heater switch in series connection, a first relay coil circuit including said high-heat contact, and said relay coil and a second Relay coil circuit series connecting said moderate temperature contact, first resistance heater, second resistance heater and said coil for energizing said relay coil when said first heater switch is open; whereby when said first and second heater switches are open and said cooling switch is closed, closing of said moderate temperature contact energizes said coil and positions said relay switch means in its second position to operate said fan on a cooling fan speed, closing of said heater switches de-energizes said relay coil and completes the first heater circuit, and subsequent closing of said thermostat high-heat contact re-energizes said relay coil and connects said heaters in parallel across said supply lines.

Claim 6

A control circuitry for controlling the operation, from a pair of power supply lines, of a multiple-speed fan for circulating enclosure air in a combination refrigeration cooling and electrical heating system including first and second electrical resistance heaters comprising: a multiple-pole, double-throw relay including a relay coil and a switch means for selectively controlling the operating speed of said fan and movable from a first fan-speed position to a second fan-speed position upon energization of said coil; a thermostat including first temperature-responsive switch means having a cooling contact and a high-heat contact connected to said second resistance heater and a second temperature-responsive switch means having a moderate termperature contact connected to said first resistance heater; a gang switch having a cooling and a heating position and including first and second heater switches and cooling switches interconnected for alternative closing of said heater switches or said cooling switch, said first heater switch in the heating position connecting said relay heating switch means to said thermostat moderate temperature contact and said second heater switch connecting both of said heaters in parallel to one of said supply lines, said cooling switch connecting said thermostat cooling contact to said relay cooling switch means; circuits for connecting said resistance heaters and relay coil to said power lines comprising a first heater circuit including said low-heat contact, said first heater and said first heater switch in series connection, a second heater circuit including said high-heat contact, said second resistance heater and said first heater switch in series connection, a first relay coil circuit including said high-heat contact, and said relay coil and a second Relay coil circuit series connecting said moderate temperature contact, first resistance heater, second resistance heater and said coil for energizing said relay coil when said first heater switch is open; whereby when said first and second heater switches are open and said cooling switch is closed, closing of said moderate temperature contact energizes said coil and positions said relay switch means in its second position to operate said fan on a cooling fan speed, closing of said heater switches de-energizes said relay coil and completes the first heater circuit, and subsequent closing of said thermostat high-heat contact re-energizes said relay coil and connects said heaters in parallel across said supply lines.

Claim 7

Control circuitry according to claim 4 for controlling a system including both an enclosure air fan and an outdoor fan and said relay includes switch means controlling the operation of said outdoor fan.

Claim 8

Control circuitry according to claim 4 including switch means for either cycling said fan under control of said thermostat or continuously operating said fan.