Greenheck DG / DGX with Direct Spark (470652) - Manual (Page 4)

Direct Spark Ignition Make-Up Air 4
®
NOTE
The use of all lifting lugs and a set of spreader bars is
mandatory when lifting the unit.
NOTE
Some units come with the weatherhood attached and
Step 5 may not apply.
Installation of Arrg. DB / HZ / UB
1. Install Curb and/or Equipment/Leg Support(s)
Position curb and/or equipment/leg support(s) on the
roof (reference the CAPS submittal for placement 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/leg support(s) to the roof,
remove metal cover, flash to wooden nailer and reinstall
cover.
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 a support for the ductwork.
Metal Cover
Equipment
Support
Roof Curb
Curb and Equipment Support
Complete Rooftop Installation
Leg Supports
Unit Profile and Leg Support
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.
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.
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. If the optional evaporative
cooling module was selected, this step does not apply,
refer to the Installation of the Optional Evaporative
Cooling Module section, page 6.
6. Seal Weatherhood Seam
Using an appropriate sealant, seal the seam between
the weatherhood and the unit.
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).
Supply Air Ductwork
(Arrangement DB only)
Sealant
Ductwork
Setting Unit