Packaged Rooftop Ventilator
7
Handling Concerns for Units with
Packaged DX
Units having packaged DX have a system that is
pressurized with refrigerant and if it is damaged,
the refrigerant could leak into the atmosphere or
cause bodily harm due to the extreme cold nature of
expanding refrigerant. Use protective equipment such
as gloves and safety glasses to minimize or prevent
injury in case of a system leak during installation.
Before Lifting - Vestibule
Determine whether or not the unit has a vestibule that
must be field-attached to the side of the unit. Vestibules
are shipped assembled but detached from the unit.
They have lifting lugs on them so they can also be lifted
by crane, but the installed location of the unit may make
it preferable to install the vestibule on the unit prior to
lifting.
Before Lifting - Field Power Access
Determine where high voltage and low voltage wiring is
to be brought into the cabinet. If wiring is to be brought
into the cabinet through the floor, see Alternate Supply
Entry Locations in this manual. If unit is to be installed
on a roof, cut access openings in the roof deck as
needed.
Lifting
1. Before lifting, be sure 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. Always test-lift the unit to check for proper balance
and rigging before hoisting to desired location.
6. Never lift unit by weatherhood.
7. Never lift units in windy conditions.
8. Preparation of curb and roof openings should be
completed prior to lifting unit to the roof.
9. 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.
10. Do not use fork lifts for handling unit.
Additional Clearances for
Packaged DX Units
Packaged DX units require additional clearance
because they must have unrestricted air movement
around the condenser coil and condenser fans. Hot air
is being discharged from the condenser fans during
operation. Enough clearance must be provided to
avoid recirculation or coil starvation. When equipped
with condenser coils, the unit should never be placed
under an overhang or inside a building. A minimum of
48 inches above the condenser fans is acceptable, but
unobstructed is strongly recommended.
Minimum 48 inches clearance
Minimum 18 inches
clearance
Condenser Coil
Condenser Fans
End view of roof top unit with Packaged DX
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
