Greenheck MSX (470658) - Manual (Page 4)

4 Modular Supply Make-Up Air Unit
®
Installation of Arrangement DB / HZ / UB
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 metal cover, flash to
wooden nailer and reinstall cover.
Metal Cover
Equipment
Support
Roof Curb
Roof Curb and Equipment 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.
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.
3. Seal Wall Opening.
Apply sealant around
the perimeter of the
weatherhood to
prevent water
penetration and
drafts into the
building.
NOTE
Two nuts must be used on each end of each threaded
hanging rod for proper support.
NOTE
Good duct practices should be followed for all
ductwork. Ductwork should be installed in accordance
with SMACNA and AMCA guidelines, NFPA 96 and
any local codes. Reference the CAPS submittal for
duct sizes.
Sealant
Seal Wall Opening
Installation
Service Clearances
Floor Top Sides Ends
Insulated/
Units
0 inches
(0 mm)
0 inches
(0 mm)
0 inches
(0 mm)
0 inches
(0 mm)
Non Insulated
Units
0 inches
(0 mm)
6 inches
(152.4 mm)
6 inches
(152.4 mm)
6 inches
(152.4 mm)
Clearance to combustibles is defined as the minimum distance required
between the heater and adjacent combustible surfaces to ensure the
adjacent surface’s temperature does not exceed 90 degrees above the
ambient temperature.
Recommended Minimum Service Clearances
Housing 32 and less
42 inches (1066.8 mm)
on the controls side of the unit
Housing 35 and higher
48 inches (1219.2 mm)
on the controls side of the unit
Clearances for component removal (such as evaporative cooler media)
may be greater than the service clearances listed.
Installation of Indoor Unit
1. Install Hangers. Install threaded hangers from
ceiling supports. When locating hangers, allow
enough room to open access panel(s). Two nuts
must be used on the end of each threaded hanger.
Ceiling supports are supplied by others.
2. Install Unit. Using sheet metal screws, attach the
weatherhood/thru-wall/filter section to the blower/
burner section. The flange on the weatherhood/thru-
wall/filter section should overlap the flange on the
blower/burner section.
Raise the assembled unit into place.
Using two nuts per hanger, fasten the unit supports
to the hangers under the unit. Appropriate unit
supports, such as the optional hanging bracket kit or
c-channel and angle iron (supplied by others) should
be used.
Using self tapping screws, attach ductwork to unit.
In order to prevent the unit from swinging and
to provide a safe environment for service and
maintenance, additional measures must be taken to
secure the unit in all directions.
Unit Supports
Ceiling Supports
Hangers
Ductwork
Indoor
Mounting