O Tube Ac System Diagram. The schematic arrangement of the system is shown in fig. Its contained in a metal box called a plenum and sits on top of your furnace.
If you have a horizontal furnace in an attic the evaporator coil will sit on one end of the furnace instead of on top. The inside unit or indoor coil are. It keeps the refrigerant flowing through the system at specific rates of flow and at specific pressures.
The outside air flows through a damper and mixes up with the re circulated air which is obtained from the conditioned space.
It takes refrigerant vapor in from the low pressure side of the circuit and discharges it at a much higher pressure into the high side of the circuit. If you have a horizontal furnace in an attic the evaporator coil will sit on one end of the furnace instead of on top. If orings andor seals for r1 2 air conditioning sys tems are used by mistake in the connections of an r 134a air conditioning system the oring and seals will foam and swell resulting in leakage of refrigerant. Its contained in a metal box called a plenum and sits on top of your furnace.