Greenheck DG / DGX Industrial Space Heating (464044 IOM) (Pre-2009) - Manual (Page 4)

Step 1 Install Curb
Position curb on the roof (reference the CAPS
submittal for placement of curb in relation to the unit).
Verify that the curb is level, shim if necessary. Attach
curb to roof and flash into place. Refer to figure #3.
Step 2 Install Ductwork
Good duct practices should be followed for all ductwork. All ductwork should be installed in accordance with
SMACNA and AMCA guidelines, NFPA 96 and all local codes. Reference the CAPS submittal for ductwork sizes.
Be sure to allow for the recommended diffuser height outlined in the diffuser installation instructions.
Apply an appropriate sealant around the perimeter of the curb and duct adapter to isolate fan vibration and
prevent water penetration. Refer to figure #4.
Step 3 Install Unit
Use a crane and a set of spreader bars hooked to the
factory lifting lugs to lift and center the unit on the
curb. Use self-tapping sheet metal screws to fasten
the unit to the curb. See figure #5.
Step 4 Assemble and Install
Weatherhood
The weatherhood can now be assembled and
attached to the unit. Detailed assembly instructions
can be found with the weatherhood. Once the
weatherhood is installed, use an appropriate sealant
to seal the seam between the weatherhood and the
unit.
Supply Air Duct Work
(Arrangement DB only)
Sealant
Installation - Arrangement DB / HZ
I - 2
NOTE!
The use of all lifting lugs and a set of spreader
bars is mandatory when lifting the unit.
NOTE!
The use of a duct adapter is recommended on a
downblast (DB) arrangement to align the
ductwork with the supply unit and is only a guide
and is not to be used to support the ductwork.
er
Equipment
Support
Roof Curb
Figure 3. Roof Curb
Figure 4.
Ductwork
Figure 5.
Placing Unit
Figure 6. Complete Rooftop Installation