R - C 8
Reference Materials
Three-Stage Gas Furnace
Pressure Switches And Interconnecting Hose Diagrams
There is an orifice installed in the black tee. This tee
& orifice assembly is connected to the black side of
pressure switch #1. The orifice & tee assembly is not
universal. The orifice is sized for the furnace’s BTU
input capacity.
Pressure switch #1 has two black and two gray
pressure ports. The black side of pressure switch #1
is connected to the furnace’s burner box. The gray
side of the switch is connected to the recoupitive cells
cold header tee.
The closing negative pressure, in inches of water
column, is printed on the switch label.
These two switches are an assembly. Separate
switches are not available.
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