Page 7
Installer’s Guide
Lifting and Rigging
IMPROPER UNIT LIFT!
Test lift unit approximately 24 inches to verify proper center of gravity
lift point. To avoid dropping of unit, reposition lifting point if unit is not
level. Failure to properly lift unit could result in death or serious injury
or possible equipment or property-only damage.
▲
WARNING
!
Rooftop Installation -- Frame Mounting
For roof top applications using field fabricated frame and ducts, use the fol-
lowing procedure:
1. Locate and secure the frame to the roof by bolting or welding. See Figure
4 on page 8
.
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 airflow ducts to the roof.
4. All fabricated outdoor ducts should be as short as possible.
5. Place the unit on the frame.
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 con-
sideration when locating the duct entrance openings. Figures 1 & 2, on
pages 4-5, provide unit dimensions.
12. Continue with the remaining installation sections.
Rooftop Installation -- Flat Roof - No Frame
For roof top applications using field fabricated ducts and sleeper rails rather
than a curb or frame, use the following procedure:
1. Locate and secure the sleeper rails to the roof by bolting. Two (2) sleeper
rails are required. One on each end to support the edges of the unit. 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 airflow ducts to the roof.
4. All fabricated outdoor ducts should be as short as possible.
5. Place the unit on the rails.
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 rails.
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 consider-
ation when locating the duct entrance openings. Figures 1 & 2, on pages
4-5, provide unit dimensions.
12.Continue with the remaining installation sections.
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. Fail-
ure to observe these warnings may result in equipment damage.
1. Before preparing the unit for lifting, check the unit dimension drawings
for center of gravity for lifting safety (Figures 1 & 2, page 4-5). Because
of placement of internal components, the unit’s weight may be unevenly
distributed. Approximate unit weights are also provided in the unit drawings.
2. When hoisting the unit, be sure that a proper method of rigging is used.
Use 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.
3. When the air ducts have been properly installed, the unit is ready to be
hoisted to the roof and set in position.
Attaching Ductwork to Roof Frame
Follow these guidelines for ductwork construction:
Connections to the unit should be made with three (3) inch canvas connectors
to minimize noise and vibration transmission.
Elbows with turning vanes or splitters are recommended to minimize air noise
and resistance.
The first elbow in the ductwork leaving the unit should be no closer than two
(2) feet from the unit, to minimize noise and resistance.
To prevent leaking, do not attach the ductwork to the bottom of the unit base.
Attaching Ductwork to Unit
All conditioned air ductwork should be insulated to minimize heating and
cooling duct losses. Use a minimum of two (2) inches of insulation with a
vapor barrier. The outside ductwork must be weatherproofed between the
unit and the building.
When attaching ductwork to a the unit, provide a flexible watertight connection
to prevent noise transmission from the unit to the ducts. The flexible connection
must be indoors and made out of heavy canvas.
NOTE: Do not draw the canvas taut between the solid ducts.
Ductwork Installation
