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Installation
Figure 12. Unit rigging
Typical 40 to 130 Ton Unit
Spreader
Bars
Figure 13. Typical unit base and roof curb cross
section
Ships with Curb,
Field Installed Gasket
3/8"
2-13/16"
19/32"
30
12' 0"
Minimum
Unit Base
Lifting Lug
3"
1-19/32"
2-1/2"
2" x 4" Nailer
(Furnished with Kit)
1-7/16"
Spreader Bar Lengths:
– 8' for 20 to 59 ton unit
– 10' for 60 to 75 ton unit
– 12' for 90 to 130 ton unit
Spreader
Roof
Curb
Clevis or
Chain
General Installation
Requirements
The checklist below is a summary of the steps required to
successfully install a Commercial rooftop unit. This
checklist is intended to acquaint the installing personnel
with what is required in the installation process. It does not
replace the detailed instructions called out in the applicable
sections of this manual.
☐ Complete
☐ Verify that the installation location of the unit will
provide the required clearance for proper operation.
☐ Assemble and install the roof curb. Refer to the current
edition of the roof curb installer's guide.
☐ Fabricate and install ductwork; secure ductwork to
curb. Do not use the unit to support the weight of the
ducting.
☐ Install pitch pocket for power supply through building
roof. (If applicable).
Rigging the Unit
☐ Set the unit onto the curb; check for levelness.
☐ Ensure unit-to-curb seal is tight and without buckles or
cracks.
☐ Install and connect condensate drain lines to each
evaporator drain connection.
☐ Remove the shipping hardware from each compressor
assembly.
Typical 20 to 36 Ton Unit
Bar
7' Minimum
Lifting
Lug (typical)
Lifting Lug
5.0 MIN
Web Sling Shackle
Shackle working load limit to be sized to
meet total lifting weight requirements.
"Unit Inspection," p. 13
checklist.
Lifting
Cable
Pedestal
End
RT-SVX072D-EN
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