Greenheck DG/DGX Pilot Ignition (470651_IOM) - Manual (Page 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
Arrangement DB / HZ / UB
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.
Setting Unit
Metal Cover
Equipment
Support
Roof Curb
Curb and Equipment Support
Complete Rooftop Installation
Leg Supports
Unit Profile and Leg Support
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.
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.
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).
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.
Supply Air Ductwork
(Arrangement DB only)
Sealant
Ductwork
Model DG / DGX Pilot Ignition Make-Up Air 4
®