Installation; Installation Clearances; Mounting On Field Furnished Supports - Trane GRAA Installation Operation & Maintenance

Figure 2B
18"
(457 mm)
AI R FLOW
(45 7 mm)
Blower
c
0
U
0
U
U
W
Duct Furnace I Duct Furnace
D3 8 6 5
F*
"` Refer to Outdoor Duct Furnace Manual for spec ific clearances .
Supply Plenum 16"-- .
(457 mm)
If a single, double or triple duct furnace only unit is
III . INSTALLATION
connected to a return air duct or any other inlet air
restriction, the appliance shall be installed on the
positive pressure side of the air circulating blower.
Installation must conform with local building
codes or in the absence of local codes with the
National Fuel Gas Code ANSI Z223 . 1 latest edi-
ti on .
A heat loss study and a complete layout of the sys-
tem should be made first.
When locating the unit in its permanent location,
make certain that the roof is capable of carrying the
additional load of the equipment. Check the unit net
weights section of this manual .
Make certain that clearances are provided for ser-
vice, minimum clearance to combustible material and
to venting cap. See figure 2 for this information.
Ducts connected to units which do not have either a
blower section or a supply plenum must have a
removable access panel in the duct, which is con-
nected to a duct furnace. The duct openings shall be
accessible when the unit is installed in service and
shall be of such size that smoke or reflected light
may be observed inside the casing to indicate the
presence of leaks in the heating element. The covers
for the panels shall be attached in such manner as to
prevent leaks. Ducts exposed to the outdoors must
be insulated and sealed to prevent water from enter-
ing either the unit or building through the duct.
CAUTION: Remove wooden shipping support
from beneath blower housing of Blower Section
to prevent possible unit damage or improper unit
operation (if applicable).
INSTALLATION CLEARANCES
Minimum clearances to combustible material are
shown on the unit data plate. It is important that
clearances be maintained for servicing the unit (refer
to Submittal Insert for service clearances), and that
minimum clearances are provided from the unit
(including vent cap, if Natural Vent model) to com-
bustible material. Clearances around the outside air
hood (if unit is so equipped) must be unobstructed.
See Figure 2.
MOUNTING ON FIELD FURNISHED SUPPORTS
Single, double, triple duct furnace only models have
base rails which are suitable for mounting either
directly on solid planking or steel channels. N ever
install the unit on a soft roof where the rails could
sink, reducing clearance between the bottom panel
and the roof, or cause damage to the roofing surface.
All other models must use the following method or an
equivalent when unit supports are field furnished:
Each section of the Rooftop unit must be supported,
which includes supports located at both ends. If the
unit consists of a High CFM Blower section, a DX
Coil, a Duct Furnace and a Supply Plenum, five sup-
ports are required. See Figure 3.
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