11
Packaged and Split Rooftop Ventilator
© 2021 Mitsubishi Electric US, Inc.
Premi
Sys
Lifting
1. Ensure that all shipping materials have been
removed from unit.
2. To assist in determining rigging requirements,
weights are provided in the Unit Weights &
Dimensions section of this manual.
3. Unit must be lifted by all lifting lugs provided at top
of unit.
4. Spreader bars must span the unit to prevent
damage to the cabinet by the lift cables.
5. Never rest the spreader bar on the unit.
6. Always test-lift the unit to check for proper balance
and rigging before hoisting to desired location.
7. Never lift unit by weatherhood.
8. Never lift units in windy conditions.
9. Preparation of curb and roof openings should be
completed prior to lifting unit to the roof.
10. Check to be sure that gasketing (supplied by
others) has been applied to the top of the curb prior
to lifting the unit and setting on the curb.
11. Do not use forklifts for handling unit on housing
sizes 1, 2, 4, and 5.
12. If using forklift on housing 0, use forks with 48-inch
length and ensure forks extend to opposite side of
unit using factory-installed forklift pockets at unit
base.
WARNING
Spreader bars are required to prevent damage to the
cabinet, failure to do so can result in damage that is
the installer’s responsibility.
Installation
Roof Curb Mounting
Roof curb details, including duct locations and
dimensions, are to be found in the roof curb assembly
instructions.
Rooftop units require curbs to be mounted first. The
duct connections must be located so they will be clear of
structural members of the building.
1. Factory-supplied roof curbs.
Roof curbs are model
GKD which are shipped in a knockdown kit (includes
duct adapters) and require field assembly (by others)
on all housing sizes except MP-5-1, which are shipped
assembled. Assembly instructions are included with the
curb kit.
2. Install curb.
Locate curb over roof opening and fasten
in place. Check that the diagonal dimensions are within
± 1/8 inch of each other and adjust as necessary. For
proper coil drainage and unit operation, it is important
that the installation be level. Shim the curb as required to
level. Install gasketing on top surface of curb (provided
by others).
3. Install ductwork.
Installation of all ducts should
be done in accordance with SMACNA and AMCA
guidelines. Duct adapters are provided to support ducts
prior to setting the unit.
4. Set the unit.
Lift unit to a point directly above the curb
and duct openings. Guide unit while lowering to align
with duct openings. Roof curbs fit inside the unit base.
Make sure the unit is properly seated on the curb and
level.
5. Fasten the unit,
Fasten the unit to the curb/
equipment support(s) using appropriate methods. The
installer is responsible for determining appropriate
support and fastening methods to ensure compliance
with all applicable codes.
6. Install vestibule.
If unit was ordered with a vestibule
and it has not yet been attached to the unit, caulk and
attach the vestibule at this time.
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Typical Unit with Condensing Section and
Factory-Supplied Curb Kit
