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Installer's Guide
2. Insert the four (4) lifting lugs in the openings provided in the drip
lip on each end of the unit. See Figure 9 inset B, page 13. A
tap or jerk to the lug will overcome the interference that arises
due to the dimple on the lug.
3. When hoisting the unit, be sure that a proper method of rigging
is used. Use either the unit's top shipping skid and straps or
slings and spreader bars for protection during lifting. Always
test-lift the unit to determine the exact unit balance and stability
before hoisting it to the installation location.
IMPORTANT: Do not lift the unit without test lifting for balance
and rigging. Do not lift the unit in windy conditions or above
personnel. Do not lift the unit by attaching clevis, hooks, pins,
or bolts to the unit casing, casing hardware, corner lugs, angles,
tabs, or flanges. Failure to observe these warnings may result
in equipment damage.
4. When the curb and air ducts have been properly installed, the
unit is ready to be hoisted to the roof and set in position.
To prevent damage to the sides and top of the
IMPORTANT:
unit when hoisting, retain the top shipping skid on the unit
or use "spreader bars" as shown on page 13.
IMPORTANT: The unit must be lowered into position. The
P.V.C. rubber tape on the curb flange permits the unit to be
repositioned if required without destroying the P.V.C. rubber
seals affixed to the mounting curb.
Placing the Unit on the Mounting Curb
1. The unit is designed with a perimeter drip lip that is lower than
the unit base pan, see Figure 9, inset A, page 13.
2. Position the unit drip lip down over and in contact with the
outside corner of the curb. Continue to lower the unit on top of
the curb, with the unit drip lip astraddle, and in contact with, both
the end and side rail of the curb. The unit should now rest on
top of the curb.
3. Take the hold-down brackets shipped with the curb (utility curb
only) and secure the unit to the curb.
Page 12
Figure 8. Converting Horizontal to Down Airflow
NOTE The ductwork is installed as part of the curb installation.
Do not attach ductwork to the unit and lower the unit with
ductwork onto the curb.
Rooftop Installation -- Frame Mounting
For roof top applications using a field fabricated frame and ducts,
use the following procedure:
1. Locate and secure the frame to the roof by bolting or welding.
Add flashing as required. Flashing must conform to local
building codes.
2. Prepare the hole in the roof in advance of installing the unit.
3. Secure the horizontal or down airflow ducts to the roof. Refer
to the previous Convert from Horizontal Airflow to Down Airflow
section, page 11, if conversion is needed.
4. All fabricated outdoor ducts should be as short as possible.
5. Place the unit on the frame. Refer to Figures 11 or 12, page 14.
6. The unit must be mounted level for proper drainage of water
through the holes in the base pan.
7. Secure the unit to the frame.
8. Insulate any ductwork outside of the structure with at least two
(2) inches of insulation and then weatherproof. There must be
a weatherproof seal where the duct enters the structure.
9. The unit should not be exposed to direct roof water runoff.
10. Flexible duct connectors must be of a flame retardant material.
All duct work outside of the structure must be insulated and
weatherproofed in accordance with local codes.
11. Access and service clearances for the unit must be given
careful consideration when locating the duct entrance open-
ings. Figures 1 - 6, pages 4-9, provides unit dimensions.
12. Continue with the following installation sections to complete
the installation: Ductwork (page 15), Filter (page 16), and
Electrical Wiring (page 16).
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