reinforced.
Check the weight of the unit in relation to the roof
structure and local building codes or ordinances and
reinforce roof structure if necessary.
- Support for the unit MUST be level and strong enough
to carry unit weight. The support may consist of a
platform or a combination of platform and roof beams or
curb.
HOISTING
NOTE: All access panels MUST be secured in place before
hoisting.
The unit should be hoisted with two lifting slings. Attach the
slings to rigging shackles that have been hooked through
holes in the base rail.
Two spreader bars MUST be placed on top of the unit to
protect the unit from damage from the pressure exerted by
the slings. Make sure that all equipment is adequate to
handle the weight ofthe unit and that the slings will not allow
the unit to shift.
Refer to Figure 8 for illustrated rigging instructions and
weight chart.
DOWNFLOW CONVERSION
NOTE: In downflow applications with roof curbs or jack
stands, the center rail under the unit must be removed. The
center rail is attached to the base rail with screws.
These units are adaptable to downflow use. To convert to
downflow use, follow these steps:
1. Remove the blockoff plates found in the return air
compartment and the supply air compartment.
NOTE: Blockoff plate in the supply air compartment only
contains one screw. If reinstalling plate, back part of plate
MUST fit into mating dimples on flange. To reinstall, slant
plate into dimples, then put plate into position and fasten
with screw.
2. Install the removed plates on the horizontal return and
supply air openings.
3. Install roof curb on the building. Be sure to follow all
directions included with curb and all applicable building
codes in your installation.
Condensate Drain
The condensate drain outlet is a 3/4" (19.1 mm) female PVC
connection located at the bottom on the left hand side (see
FIGURE 2).
The circulating blower creates a negative pressure on the
condensate drain line that can prevent the condensate from
draining properly. To combat this negative pressure, a field
supplied condensate trap that will allow a standing column
of water of at least 2" (50.8mm) MUST be installed. Top of
outlet from trap MUST be at least 1" (25.4mm) below top of
outlet from unit. Install the trap as near to the unit as
possible for proper drainage,
A 3/4" (19.1 mm) drain line MUST be installed if required by
local codes or if location of unit requires it. Run the drain line
to an open drain or other suitable disposal point.
FIGURE 2 1 Condensate Drain Information*
(25.4mm)
(
2" (50.Smm)
3/4" (19.1mm)
Female PVC
Fitting _
3/4" (19,1mm)
Drain Line
* Condensate trap MUST be installed.
80-31-32
141
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