Goodmans ASX User Manual

72

3. Add the two readings together.

NOTE: Both readings may be taken simultaneously and read
directly on the manometer if so desired.

4. Consult proper table for quantity of air.

If external static pressure is being measured on a furnace to
determine airflow, supply static must be taken between the
"A" coil and the furnace.

1. Using a draft gauge (inclined manometer), connect the

positive probe underneath the coil and the negative probe
above the coil.

2. A direct reading can be taken of the static pressure drop

across the coil.

3. Consult proper table for quantity of air.

If the total external static pressure and/or static pressure drop
exceeds the maximum or minimum allowable statics, check
for closed dampers, dirty filters, undersized or poorly laid out
duct work.