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Ground Level Installation
Ground level platform requirements:
- The unit MUST be situated to provide safe access for servic-
ing.
Platform may be made of either concrete or pressure treated
wood and MUST be level and strong enough to support unit
weight.
Position platform separate from building foundation.
Install in well-drained area, with top surface of platform
above grade level.
Platform must be high enough to allow for proper condensate
trap installation and drainage. See FIGURE 4 and
associated text for more information about condensate
drainage.
Rooftop Installation
Rooftop platform requirements:
- The unit MUST be situated to provide safe access for servic-
ing.
- The existing roof structure MUST be adequate to support the
weight of the unit or the roof MUST be 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. See FIGURE 21 in the back cover of
this manual for unit weights.
- 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.
- See Hoisting section below for hoisting instructions.
HOISTING
NOTE: All access panels MUST be secured in place before hoist-
ing.
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 of
the unit and that the slings will not allow the unit to shift.
Refer to FIGURE 21 on the back cover of this manual for illus-
trated rigging instructions and weight chart.
DOWNFLOW CONVERSION
These units are adaptable to downflow use. To convert to down-
flow use, follow these steps:
1. Remove the blockoff plates found in the return air compart-
ment and the supply air compartment. See FIGURE 2.
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 direc-
tions included with curb and all applicable building codes in
your installation. (See Pages 2 or 3 for appropriate curb to
use with your model.)
FIGURE 2 Blockoff Plate (Return Air Compartment)
Heating Vent Assembly
The flue cover is packed with screws in the return air compart-
ment, Refer to FIGURE 3 and assemble as shown.
FIGURE 3 _ Heating Vent Assembly
1
Flue Support
(Shipped mounted to unil
Flue Cover
\
Condensate Drain
The condensate drain outlet is a 3/4" (19.1 mm) threaded female
PVC connection located atthe bottom of the unit to the right ofthe
filter access panel (see FIGURE 4). Condensate drain outlet
MUST be held with wrench when installing trap and drain line.
The circulating blower creates a negative pressure on the con-
densate drain line that can prevent the condensate from draining
properly. To combat this negative pressure, a field supplied con-
densate 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.
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