SERVICING
101
Furnace External Static Pressure
To determine proper airflow, proceed as follows:
1.
With clean filters in the furnace, using a Inclined Manometer
or Magnehelic gauge measure the static pressure of the
return duct at the inlet of the furnace. (Negative Pressure)
2. Measure the static pressure between the furnace and the
inlet of the evaporator coil. (Positive Pressure). The limit
switch can be removed, and probe inserted to obtain this
reading.
3. Add the two (2) readings together for total external static
pressure.
NOTE: Both readings may be taken simultaneously and
read directly on the manometer if so desired. If high
Efficiency Air Filter or Electronic Air Cleaner is used in
conjunction with the furnace, the readings must also
include these components, as shown in the following
drawing.
4.
Consult proper airflow tables for the quantity of air (CFM).
If the total external static pressure exceeds the minimum
or maximum allowable statics, check for closed dampers,
registers, undersized and/or oversized poorly laid out
ductwork.
Static Pressure Drop
Periodic Maintenance
Motors
Indoor and Outdoor motors are permanently lubricated and
do not need additional oiling.
Cleaning Outdoor Coil
1. Check for oil deposits on coil this could be an indication of
possible leak. If no leak detected spray coil with ordinary
household detergent.
2. Using garden hose, spray coil vertically downward with
constant stream of water at moderate pressure. Keep
nozzle at a 15− to 20° angle, about 3 in. from coil face.
Spray so debris is washed out of coil and base pan.
3. Reinstall top cover and position blade.
4. Reconnect electrical power and check for proper operation.
Cleaning Outdoor Fan Blade
1. Check balance weights on fan blade.
2. Check fan blade setscrew for tightness.
Electrical Controls and Wiring
1. Disconnect power to both outdoor and indoor units.
2. Check all electrical connections for tightness.
3. Tighten all screws on electrical connections.
4. Connections that appear to be burned or smoky should
be disassembled and cleaned all parts
5. Wire connections that appear burned and corroded
should be replaced and crimp tightly to assure they do
not overheat.
6. Reconnect electrical power to indoor and outdoor units
and check for proper operation.
Summary of Contents for ANX
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