Aerovent IM-500 - Manual (Page 5)

5 Aerovent IM-500
Return ducts should be designed in the same manner.
Where ductwork (or other enclosure) is installed to the inlet
or outlet of the unit in such a way as to cause a possible
gas trap and accumulation of a flammable mixture, a pre-
purge cycle shall be incorporated to provide not less than
4 complete air changes to the ductwork (or enclosure) by
volume prior to an ignition attempt.
Fire Dampers
Fire dampers installed in the inlet or outlet duct systems
shall be provided with electrical interlocks connected in the
safety limit control circuit so as to cause the heater to shut
down in case of fire in the ductwork, or heater. The elec-
trical interlocks must be so arranged that the safety
circuit is electrically energized only when the fire damper is
in the wide open position.
Utility Connections
Electric and control connections can be made from the side
or the bottom of the unit. The factory supplied gas connec-
tor is located on the side of the unit. The units normally are
supplied with factory mounted disconnects; holes can be
cut in the fixed side panels, or bottom of the unit for elec-
trical connections. Sealing of holes cut in the unit casing
for utility connections should be done with care to prevent
air and water leaks. All external wiring connections for out-
door units must be made with seal tight conduit. All wiring
must be in accordance with the National Electric Code.
Rigging Instructions
Each unit is supplied with four mounting and lifting brack-
ets with 1” clearance holes for lifting hooks. When units
are supplied with factory mounted accessories,
“DO NOT use the accessory lifting eyes to sup-
port the load of the unit”. The accessory lifting eyes
should only be used to steady the load. The main load
should be placed on the unit’s lifting lugs.
The unit lifting lugs are supplied at the top of the
Aerovent units and provide maximum strength for lifting.
In order to lift the unit without damaging the
case, SPREADER BARS MUST BE USED!
A bead of caulking must be applied to the face of all
flanges just prior to mounting and bolting. Then, bead
should be applied to outside seams after installation.
CAULKING IS NOT SUPPLIED WITH THE UNIT!
Unit Installation
Follow the site preparation instructions for applicable
curb, rail, or slab mounted as noted in this section of the
manual. Check the nameplate of the unit before lifting to
insure that the model and serial number shown matches
that shown on the shipping papers. Check unit dimensions
and mounting holes prior to installation to ensure smooth
installation experience.
If the unit is mounted on a factory supplied curb:
1. Install roof curb using roof curb instructions (as noted
in this section of the manual).
2. Thoroughly clean and dry the top of the curb surface.
3. Attach a curb gasket around the top perimeter of the
curb.
4. Lift the unit into place and set the unit down evenly
on curb. Check to make sure unit is level and is firmly
seated on all corners of the curb.
5. If units are supplied with accessories for field mount-
ing, attach all accessories after the unit has been set in
place.
6. Make final unit connections to the electric power supply
and remote control circuits. Connect gas lines.
NOTE: Blow lines clean of shavings and sealant before
connecting to the unit pipe train (strainers are recom-
mended between gas supply lines and manifold pipe
train). Caulk all utility clearance holes and seams on the
unit after connections have been made.
If the unit is to be rail or slab mounted, use similar direc-
tions as noted in this installation section.
Slab Mounted Units
For ground level installation of unit, prepare a level con-
crete slab at least 4" thick and extending 6 inches beyond
the unit on an adequate footing and a generous bed of
gravel for proper drainage. The slab should include thread-
ed anchor bolts to fit mounting holes and spaced according
to unit mounting dimension per unit drawings for securing
the unit in place. The anchor bolts should extend at least
2" above surface of the mounting slab to allow clearance
for mounting washers and nuts (bolts, mounting washers,
and nuts by others).
Other Notes:
Units are not always shipped in one piece. Some field
assembly is typically required. Hardware is included; sealant
and gaskets are not in all cases. FCBT units include a seal-
ing tape for the flanges. ALL others units do not include
any sealants. Please contact your local representative for the
breakdown of the number of pieces prior to shipping.
Aerovent ships units in the most economical way.
Should it be desired to ship a larger or vertical unit in one
piece, please contact your representative immediately.
Inspect all seams after installation and recaulk as needed.
A small hole in the caulk or a seam not caulked will allow
water penetration.
Roof Curb Mounted Units
Roof curbs should have a minimum height of 14". 24" high
roof curbs are available and raise the unit above roof water
and snow levels where required and are special ordered.
The curb can be installed with the roof in advance of the
unit. The curb is shipped knocked down with separate
instructions for its assembly, flashing, and sealing with the
roof.
Rail Mounted Units
To ensure longevity and integrity of the section joints, con-
tinuous rail mounting is preferred.
When rail mounting the units, use two continuous rails
for the length of the unit (in direction of airflow).
Where V-bank filters, dampers, and inlet
hoods are supplied additional supports are not