Piping system providing instantaneous changeover from heating to cooling and vice versa

• US 3,256,929 A
• Filed: 05/08/1964
• Issued: 06/21/1966
• Est. Priority Date: 05/08/1964
• Status: Expired due to Term

• Current Assignee: Gilbert F. Carlson
• Original Assignee: Gilbert F. Carlson
• Inventors: Carlson, Gilbert F.
• Application Number:
  US04/366,061
• Time in Patent Office: 774 Days
• US Class Current: 165/221
• CPC Class Codes: F24F 3/06 characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units

Claims

1. IN A SYSTEM HAVING A PAIR OF LIQUID CIRCUITS, EACH OF WHICH CIRCUITS INCLUDES MEANS FOR CHANGING THE TEMPERATURE OF THE LIQUID THEREIN, AT LEAST ONE HEAT EXCHANGE DEVICE ADAPTED TO BE CONNECTED SELECTIVELY IN SAID CIRCUITS, MEANS FOR CONNECTING SAID HEAT EXCHANGE DEVICE SELECTIVELY TO SAID CIRCUITS FOR FLOW THERETHROUGH, SAID MEANS COMPRISING A PAIR OF SUPPLY CONNECTIONS TO SAID HEAT EXCHANGE DEVICE CONNECTED IN PARALLEL WITH EACH OTHER AND COMPRISING A FIRST SUPPLY CONNECTION TO ONE OF SAID LIQUID CIRCUITS AND HAVING A FLOW RESPONSIVE VALVE CONNECTED THEREIN ADAPTED TO PASS LIQUID FROM SAID ONE CIRCUIT TO SAID HEAT EXCHANGE DEVICE, A SECOND SUPPLY CONNECTION TO THE OTHER OF SAID LIQUID CIRCUITS AND HAVING A CONDITION RESPONSIVE VALVE CONNECTED THEREIN, MEANS FOR ACTUATING SAID CONDITION RESPONSIVE VALVE IN ACCORDANCE WITH A DEMAND CONDITION AT SAID HEAT EXCHANGE DEVICE, A PAIR OF RE-