Page 5
3- Top of support slab should be at least 4” (102mm)
above the finished grade and located so no run-off
water from higher ground can collect around the unit.
4- Units require support along all four sides of unit base.
Supports must be constructed of steel or suitably
treated wood materials.
Duct Connection
All exterior ducts, joints, and openings in roof or building
walls must be insulated and weatherproofed with flashing
and sealing compounds in accordance with applicable
codes. Any duct passing through an unconditioned space
must be insulated.
In downflow applications, do not drill or punch
holes in base of unit. Leaking in roof may occur if
unit base is punctured.
CAUTION
!
Rigging Unit For Lifting
1- Detach wooden base protection before rigging.
2- Connect rigging to the unit base using both holes in
each corner. See figure 2.
3- All panels must be in place for rigging.
4- Place field‐provided H‐style pick in place just above
top edge of unit. Frame must be of adequate
strength and length. (H-style pick prevents damage
to unit.)
All
FIGURE 2
Lifting Point Should
Be Directly Above
Center Of Gravity.
CAUTION: DO NOT
WALK ON UNIT.
Unit
Weight*
Lbs.
Kg.
*Maximum weight with all avail
able installed accessories.
894
406
Horizontal Air Discharge
Unit is shipped with panels covering the horizontal supply
and return air openings. Remove horizontal covers and
place over downflow openings for horizontal air discharge.
See figure 3. Secure in place with sheet metal screws.
Units Equipped With An Optional Economizer
1- Remove the horizontal supply air cover and position
over the downflow supply air opening. Secure with
sheet metal screws.
2- Leave the horizontal return air cover in place.
3- Locate the separately ordered horizontal air
discharge kit. Place the kit panel over the downflow
return air opening.
4- Remove and retain the barometric relief dampers and
lower hood.
5- Install return air duct beneath outdoor air intake. See
figure 4. Install barometric relief damper in lower
hood and install in ductwork as shown in figure 4.
FIGURE 3
DOWNFLOW
RETURN AIR
OPENING
UNIT SUPPLY AND RETURN AIR OPENINGS
DOWNFLOW
SUPPLY AIR
OPENING
HORIZONTAL
RETURN AIR
OPENING
HORIZONTAL
SUPPLY AIR
OPENING
FIGURE 4
HORIZONTAL RETURN AIR DUCTWORK
WITH ECONOMIZER
HORIZONTAL
RETURN AIR
DUCT
INSTALL BAROMETRIC RELIEF DAMPERS
AND HOOD IN RETURN AIR DUCT
UNIT
UNIT