Lennox A98USMV Installation Instructions Manual page 53

Warm air gas furnace upflow/horizontal left/right air discharge direct vent
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Gas Valve
Field Installed
Figure 58. Manifold Pressure Measurement
Negative Port
Positive Port
Red and Black Tubing -
Black Tubing +
Gas Valve
Field Installed
Measuring Device
Figure 59. Operation Signal (Delta P) Measurement
508364-01
Issue 2346
Page 53 of 74

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