Unit Arrangement Db / Hz - Greenheck DGX Installation, Operation And Maintenance Manual

Installation of Arrangement DB / HZ
1. Install Curb and/or Equipment Support(s)
Position curb/equipment support(s) on the roof
(reference the CAPS submittal for placement of curb/
equipment support(s) in relation to the unit). Verify that
unit supports are level; shim if necessary. Attach curb
to roof and flash into place. Attach
the equipment support(s)
to the roof, remove
over
metal cover,
flash to
wooden
nailer and
Equipment
Support
reinstall cover.
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.
NOTE
The use of a duct adapter is recommended on a
downblast (DB) arrangement to align the ductwork
with the supply unit. The duct adapter is only a guide
and is not to be used as support for the ductwork.
3. Apply Sealant
Apply an appropriate sealant around the perimeter of
the curb and duct adapter(s) to isolate fan vibration and
prevent water penetration.
Supply Air Ductwork
(Arrangement DB only)
Ductwork
®
4. 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/
equipment support(s).
Use self-tapping sheet metal screws to fasten the unit
to the curb/equipment support(s).
Roof Curb
The use of all lifting lugs and a set of spreader bars is
mandatory when lifting the unit.
5. Assemble and Attach Weatherhood
The weatherhood can now be assembled and attached
to the unit. Detailed assembly instructions can be found
with the weatherhood.
6. Seal Weatherhood Seam
Using an appropriate sealant, seal the seam between
the weatherhood and the unit.
Sealant
Setting Unit
NOTE
Complete Rooftop Installation
DGX Industrial Space Heating 5