16
WARNING
Combustible Materials!
Maintain proper clearance between the unit heat ex-
changer, vent surfaces and combustible materials. Refer
to unit nameplate and installation instructions for proper
clearances. Improper clearances could result in a fire
hazard. Failure to maintain proper clearances could re-
sult in death or serious injury or property damage.
5. Verify that appropriate materials were used in the con-
struction of roof and ductwork. Combustible materials
should not be used in the construction of ductwork or roof
curb that is in close proximity to heater elements or any
hot surface. Any combustible material on the inside of the
unit base should be removed and replaced with appro-
priate material.
Step-by-step curb assembly and installation instructions
ship with each accessory roof curb kit. Follow the instruc-
tions carefully to assure proper fit-up when the unit is set
into place.
Note: To assure proper condensate flow during
operation, the unit (and curb) must be level.
If the unit is elevated, a field constructed catwalk around the
unit is strongly recommended to provide easy access for
unit maintenance and service.
Recommendations for installing the Supply Air and Return
Air ductwork joining the roof curb are included in the curb
instruction booklet. Curb ductwork must be fabricated and
installed by the installing contractor before the unit is set
into place.
Note: For sound consideration, cut only the holes in
the roof deck for the ductwork penetrations. Do not
cut out the entire roof deck within the curb perimeter.
If a Curb Accessory Kit is not used:
a. The ductwork can be attached directly to the factory-
provided flanges around the unit’s supply and return
air openings. Be sure to use flexible duct connections
at the unit.
b. For “built-up” curbs supplied by others, gaskets must
be installed around the curb perimeter flange and the
supply and return air opening flanges.
Rigging
A Rigging illustration and Center-of-Gravity dimensional
data table is shown in Figure 3. Refer to the typical unit op-
erating weights table before proceeding.
1. Remove all drill screws fastening wood protection to
metal baserail. Remove all screws securing wooden pro-
tection to wooden top crate.
2. Remove Wooden Top Crate.
WARNING
Heavy Objects!
Do not use cables (chains or slings) except as shown.
Each of the cables (chains or slings) used to lift the unit
must be capable of supporting the entire weight of the
unit. Lifting cables (chains or slings) may not be of the
same length. Adjust as necessary for even unit lift. Other
lifting arrangements may cause equipment or property-
only damage. Failure to properly lift unit may result in
death or serious injury. See details below.
3. Rig the unit as shown in Figure 3. Attach adequate
strength lifting slings to all four lifting brackets in the unit
base rail. Do not use cables, chains, or slings except as
shown.
4. Install a lifting bar, as shown in Figure 3, to protect the unit
and to facilitate a uniform lift. The minimum distance be-
tween the lifting hook and the top of the unit should be 7
feet.
5. Test-lift the unit to ensure it is properly rigged and bal-
anced, make any necessary rigging adjustments.
6. Lift the unit enough to allow the removal of two Fork Lift
brackets and hardware. Remove the two Fork Lift brack-
ets, two metal runners and three wooden boards as
shown in the following Figure.
7. Downflow units; align the base rail of the unit with the
curb rail while lowering the unit onto the curb. Make sure
that the gasket on the curb is not damaged while posi-
tioning the unit.
General Unit Requirements
The checklist listed below is a summary of the steps re-
quired to successfully install a commercial unit. This check-
list is intended to acquaint the installing personnel with
what is required in the installation process. It does not re-
place the detailed instructions called out in the applicable
sections of this manual.
[ ] Check the unit for shipping damage and material short-
age; file a freight claim and notify appropriate sales rep-
resentative.
[ ] Verfiy correct model, options and voltage from unit name-
plate.
Installation