Aerovent IM-391 - Manual (Page 4)

4 Aerovent IM-391
Stack Extension Installation
1. Place supplied gasket around the perimeter of the
fan outlet.
2. Lower the stack extension onto the fan housing align-
ing the bolt holes on the two components. Allow for
gasket to compress naturally prior to securing fan
housing to the adjacent component.
3. Install 316 stainless steel hardware (provided) in all
mounting holes. Use a commercially available anti-
seizing compound formulated for 316 stainless steel
to hardware.
Windband Installation
1. Using the windband lifting lugs, raise the windband
above the outlet of the fan assembly. Align the sup-
port brackets with the fan assembly discharge
2. Using caution not to swing the windband, insert the
316 stainless steel mounting hardware (provided) coat-
ed with anti-seize compound to join the two compo-
nents.
Drain Connection/Installation
Each section of the plenum mixing box as well as the
fan housing contains a 3/4" NPT drain pipe for connect-
ing to drainage system to ensure safe routing of any
liquid that may form in the system. Due to the potential
of hazardous chemical contamination, proper disposal of
liquids is required (by customer).
Note:
• A minimum of 1" of water must be placed in trap prior to
start-up to create proper “lock” of system pressure.
• Drain should periodically be cleaned out for proper op-
eration.
Damper and Actuator Installation
Access to the Isolation Damper is obtained through
opening the slide out door on the side of the plenum.
Remove bolts from face of slide out door and remove
damper/door assembly for inspection and maintenance.
The 2-Position spring return actuator is attached to the
damper shaft through the slide out door in a Nema 4
enclosure and can be removed with the damper/door as-
sembly. Wiring is completed through knockouts in Nema
4 enclosure around the actuator.
Access to Bypass Damper and Modulating Actuator for
removal is obtained by removing the weatherhood cover-
ing the damper. Damper is attached to plenum face with
standard zip screws. An inspection door is available on
the side of the weather cover for standard inspection and
maintenance of the damper. Wiring for the modulating
actuator is fed through the knockouts in the weather-
hood.
3/4" NP DRAIN IN PLENUM
MIXING BOX AND FAN
HOUSING
Figure 5. Drain
Figure 6. Damper and Actuator Assembly
PARALELL BLADE
ISOLATION DAMPER
MODULAR MIXING
PLENUM BOX
ACCESS DOOR
2-POSITION SPRING
RETURN ACTUATOR MODULATING ACTUATOR
WEATHER
HOOD OPPOSED BLADE
BYPASS DAMPER