Amana ASH13018 Service Manual download pdf (Page 65)

SERVICING

3. Add the two readings together.

TOTAL EXTERNAL STATIC

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.

TOTAL EXTERNAL STATIC

S-204 COIL STATIC PRESSURE DROP

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.

STATIC PRESSURE DROP

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.

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Amana ASH13018 Service Manual Page 65