Field Controls FAPV180-AC Manual page 7

2. Inspect the factory-installed backdraft damper vanes and their seal in the outlet collar of the FAPV
fan unit and verify proper operation of the damper. Air fl ow through the FAPV will cause the
damper vanes to open; spring pressure/air pressure will cause the vanes to close when air fl ow
ceases or tends to go back out of the FAPV towards the inlet air hood.
3. Taking care to avoid damage or obstruction to
the back draft damper, connect 6" insulated duct
(or larger if an increaser is used) to the outlet
collar of the FAPV fan unit and to the
supply or return side of the HVAC system, using
methods described in theAir Inlet (Intake Hood)
Installation section (see Figure 5) If the furnace
or fan center is installed in a mechanical closet
without a return side plenum or duct, the outlet
of the duct or FAPV fan unit may open directly
into the mechanical closet space if allowed by
code, see Figure 4.
CAUTION: CAUTION: Cold or freezing outdoor temperatures Cold or freezing outdoor temperatures
may cause pipes to rupture and/or subject mechanical may cause pipes to rupture and/or subject mechanical
equipment to temperatures below their rated minimum equipment to temperatures below their rated minimum
return or ambient temperatures. Do not discharge outdoor return or ambient temperatures. Do not discharge outdoor
air directly at a pipe or water heater, or any other item at air directly at a pipe or water heater, or any other item at
which unheated outdoor air may cause freezing. Ensure that which unheated outdoor air may cause freezing. Ensure that
the minimum return temperature rating of the HVAC unit is the minimum return temperature rating of the HVAC unit is
met by adjusting the FAPV fan speed to result in a suffi cient met by adjusting the FAPV fan speed to result in a suffi cient
mixed-air temperature (see Table on page 14 for fl ow rates mixed-air temperature (see Table on page 14 for fl ow rates
and expected minimum temperatures of outdoor air, return and expected minimum temperatures of outdoor air, return
air, and the resulting temperature of mixed outdoor and air, and the resulting temperature of mixed outdoor and
return air). return air).
WARNING: Use extreme caution to follow all manufacturer's instructions, safety warnings and cautions if a WARNING: Use extreme caution to follow all manufacturer's instructions, safety warnings and cautions if a
duct heater is to be installed. Do not install a duct heater on the duct connected to the inlet of the FAPV. duct heater is to be installed. Do not install a duct heater on the duct connected to the inlet of the FAPV.
MECHANICAL CLOSET TYPICAL INSTALLATION
Figure 5 - HVAC PLENUM TYPICAL INSTALLATION
page 7 of 20
Figure 4 -
P/N 780104900 Rev A 09/20