Greenheck MSX (470658) - Manual (Page 5)

5 Modular Supply Make-Up Air Unit
®
Supply Air Ductwork
(Arrangement DB only)
Sealant
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/equip support(s).
Setting 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. If the optional
evaporative cooling module was selected, this
step does not apply, refer to the Installation of the
Optional Evaporative Cooling Module section.
6. Seal Weatherhood Seam. Using an appropriate
sealant, seal the seam between the weatherhood
and the unit.
Complete Rooftop Installation
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 Roof Mounted Unit
Arrangement DBC
1. Install Curb/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 all unit
supports are level, shim if necessary. Attach curb
to roof and flash into place. Attach the equipment
support(s) to the roof, remove metal cover, flash to
wooden nailer and reinstall cover.
2. Install Combination Extension. Install
combination extension over curb. Lag into place
using wood screws. Locate the extension so the tall
vented side is over the exhaust opening.
3. 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 any local codes. Reference
the CAPS submittal for ductwork size and location.
Supply
Ductwork
by Others
Exhaust
Ductwork
by Others
NOTE
The use of a duct adapter is recommended on a
downblast (DBC) 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
Roof Curb and Equipment Support
Exhaust
Supply
1 inch
Inside Flange
Combination Extension
Ductwork