Haier GE NF97UM Service Manual page 56

97% upflow/horizontal modulating variable speed gas furnace
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Gas Valve
Field Installed
Figure 48. Manifold Pressure Measurement
Negative Port
Positive Port
Red and Black Tubing or Red Tubing -
Black Tubing +
Gas Valve
Field Installed
Measuring Device
Figure 49. Operating Signal (Delta P) Measurement
Page 56
31-5000723 Rev. 0

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