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Positioning on Curb —
Position unit on roof curb so that the following clearances
1
are maintained:
/
in. (6 mm) clearance between the roof
4
curb and the base rail inside the right and left,
(12 mm) clearance between the roof curb and the base rail
inside the front and back. This will result in the distance
between the roof curb and the base rail inside on the
condenser end of the unit being approximately equal to
Detail A and Detail B in Figs. 8, 9 and 10.
Do not attempt to slide unit on curb after unit is set. Doing
so will result in damage to the roof curb seal.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Flue vent discharge must have a minimum horizontal
clearance of 48 in. (1220 mm) from electric and gas meters,
gas regulators, and gas relief equipment. Minimum distance
between unit and other electrically live parts is 48 inches
(1220 mm).
Flue gas can deteriorate building materials. Orient unit such
that flue gas will not affect building materials. Locate
mechanical draft system flue assembly at least 48 in. (1220
mm) from an adjacent building or combustible material.
After unit is in position, remove rigging skids and
shipping materials.
Step 7 — Install Outside Air Hood — Factory
Option
The outside air hood for factory- - option economizer and
two- - position damper is shipped in knock- - down form and
requires field assembly. The panel for the hood top is
shipped on the end of the unit (see Fig. 12). The
remaining parts for the hood assembly (including side
panels, filters and tracks) are shipped in a carton that is
secured to the rear of the blower assembly. Access the
carton location through rear panel (see Fig. 13).
Hood Top
Shipping
Position
Fig. 12 - - Hood Top – Shipping Position
1
/
in.
2
Hood
Package
Fig. 13 - - Hood Package – Shipping Location
To remove the hood parts package:
1. Remove the back blower access panel.
2. Locate and cut the strap, being careful to not damage
any wiring.
3. Carefully lift the hood package carton through the
back blower access opening.
See Fig. 14 for identification of the various parts of the
hood assembly.
To assemble the outside air hood:
1. Remove hood top panel from shipping position on
unit end.
2. Install four angles to the upper end panel using the
screws provided.
3. Apply seal strip to mating flanges on the side plates
of the hood (see Fig. 14).
Apply Seal Strips
to the back of
these flanges
2
5
Seal Strips
C09134
Fig. 14 - - Hood Part Identification and Seal Strip
4. Secure side plates to panel using the screws provided.
5. Apply seal strip to mating flange of the hood (see
Fig. 14).
6. Secure top flange using screws provided in kit.
7. Install outdoor air screens by sliding them into the
channel formed by the four angles installed in step 2.
Make sure that the screens extend across the entire
length of the hood.
17
Apply Seal Strips
to the back of
these surfaces
Apply Seal Strip
to the front of
this flange
7
4
4
1
6
Item #
Description
Qty
1
Angles
4
2
Side Plates
2
3
Hood
1
4
Outdoor Air Screens
4
5
Side Filter Supports
2
6
Side Drip Angles
2
7
Top Diverters
2
Application Areas
C09133
3
Apply Seal Strip
to the front of
this flange
7
2
4
4
5
6
Apply Seal Strip
to the back of
this flange
C09079
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