Installation; Upflow Application - Lennox VRF VVCA Series Installation Instructions Manual

Installation

It is important to locate the unit where it can be accessed
for service in the future. Refer to unit dimensions on Page
3 for exact locations of suspension brackets, return air
and supply air openings.
Make sure that the structural ceiling is able to support
•
the weight of the indoor unit. It may be necessary to
add extra support.
• Install suspension rods in the structural ceiling or
concrete slab in a suitable location.
• If the structural ceiling is constructed of concrete,
install anchors to accept four ⅜" threaded rods to
suspend the indoor unit. If the structural ceiling
includes wooden joists, use angle iron or Unistrut
channel fixed securely in place to accept the ⅜"
threaded rods. See figure 1.
CONCRETE CEILING
USING ANCHORS
Anchor
Angle iron bolted
Threaded rod
in place across
wooden joists
Figure 1. Locate Threaded Rods
• Use either a mechanical lifting device or a minimum of
two people to raise the unit.
If necessary, install a field-provided isolation grommet
•
to prevent transmission of vibration from unit to
structural ceiling.
• If the unit is being installed in an application that
includes a sheet rock (plasterboard) ceiling, it is
recommended to install an access panel in a suitable
location to allow final connection of the refrigerant
piping, condensate line and electrical connections.
• This will also allow access for future maintenance.
• For ease of installation, it is best to make any
necessary coil configuration changes before setting
the air handler in place.
NOTE - When the unit is installed in horizontal applications,
a secondary drain pan is recommended. Refer to local
codes. Adequate support must be provided to ensure
cabinet integrity. Ensure that there is adequate room
to remove service and access panels if installing in the
horizontal position.

Upflow Application

1. The air handler must be supported on the bottom only
2. If installing a unit in an vertical application, remove the
3. Place the unit in the desired location and properly
4. Determine
Threaded rod
5. With access door removed, remove drain line opening
6. If the unit is intended to be used with an "open" return
ANGLE IRON
ACROSS
WOODEN JOISTS
Wooden joist
6
and set on a suitable base or a field-supplied support
frame. Securely attach the air handler to the floor or
support frame.
horizontal drain pan.
slope the unit, see page 11. Connect the return and
supply air plenums as required using sheet metal
screws.
knockouts
connections.
to install drain lines.
air path, ensure there is at least 14" of clearance
below the unit.
Figure 2. Upflow Configuration
required for drain line