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Old 02-27-2009, 04:40 PM   #31
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short on/off cycle times for burner/inducer

Make your own manometer


1/4 inch clear plastic tubing about 3' long.
Duct tape it to a vertical surface with a "U" shape .

Pour some water in the "U" with a drop of food coloring.

Tape a ruler at the top of the water on the out of the "U".

Put the other end of the tubing on a 1/8" pipe to 1/4" barb fitting for tubing.

Turn off the gas to the furnace. Remove the manifold pressure test plug.

Screw the pipe end of the fitting into the manifold test connection.

Turn on the gas, measure how high the water moved up the ruler. Multiply it by 2.
That is the Manifold pressure in inch of water column.

Do it for no burner flame & with burner flame.

Turn off gas before removing manometer. Replace test plugs before turning on gas.

Cost about $2.00 to make.

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Old 02-27-2009, 09:34 PM   #32
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short on/off cycle times for burner/inducer

I hope you didn't see any pressure when there was it wasn't running.

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