Amana VCA - Static Pressure Drop; Coil Static Pressure Drop; Total External Static; Air Handler External Static

197 Rev. 3
SERVICING
S-201 AIR HANDLER EXTERNAL STATIC
1. Using a draft gauge (inclined manometer) measure the
static pressure of the return duct at the inlet of the unit,
(Negative Pressure).
2. Measure the static pressure of the supply duct, (Positive
Pressure).
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 or
a BBA/BBC blower to determine airflow, supply static must
be taken between the "A" coil and the furnace.
Air Flow
TOTAL EXTERNAL STATIC
S-202 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.
High Efficiency
Gas Furnace
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.