Trane GRAA - Location and Mounting Considerations; Combustion Air Considerations; Mounting Integrity

3
Suppo
rt m
us
t clear return
a i r o penin
g a n d f i t
Ins
i de
b ase rai l f la n g e .
See
Figures 4 & 13
for this dimension.
Support
must fit
inside base rail
f lang e s.
MOUNTING
ON
ROOF CURB
Assemble
and
install roof
curb per Roof
Curb
Installation
Instructions.
See Figures
4
&
13 for roof
opening sizes,
distance
between
openings and
unit
relationship
to
roof curb.
VENTINGt
All venting
installations
shall be in
accordance with
the
latest
edition
of Part
7 ,
"Venting
of Equipment", of
the National
Fuel
Gas
Code, ANSI
Z223.1-1992 (or
the
latest edition),
or
applicable provisions
of local
building
codes.
The
Natural
Vente
d u nits'... are equipped
with
a
vent
cap which
is designed
for
n
atural
draft venting. Air
for
combustion
enters the
base
of
the
vent
cap
through
a protective grill
and
produc t
s
of
combustion are
dis-
charged
at the
upper section
of the vent
cap. t Th i s
ve
nt
c a p i s
sh i pped in
a separate
carton and
s hould
be installed
per the Venting
section of the
Outdo
or
Rooftop
Gas - F i red
Duct Fu r na
c e
In s t a lla ti
on and
Service
Manual .
The Power
Vented
unit
has
a
induced
draft venting
system.
The
combustion
air inlet
and products
of
combustion
discharge
louvers are located
in the
upper section
of the
Duct Furnace side
access
panel. Never
locate these
units in an area
where the
flue
products
discharge
outlet
may be directed at
any
fresh
air
vents.
See the
Outdoor Rooftop
Gas-Fired
Duct
Furnace
Installation
and Service
M anual for
installation
and
servicing requirements.
DUCT
CONNECTIONS
All
ductwork
must
be properly
supported
so
that
no
strain
is
put
on the
unit. Do
not alter or
bend the dis-
charge
duct
flanges
supplied
on your
furnace/air
handler.
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 a manner as
to prevent
leaks. Ducts exposed
to the outdoors
must
be insulated and
sealed to prevent water
from either
the
unit or building
through the duct.
If
a
single,
double or triple
duct furnace
only unit is
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.
When
connecting
return air
duct
to
Standard or High
CFM
cabinets,
attach duct to return air
opening
flange
when
no dampers are
used.
Otherwise,
if
dampers are
used, attach return air
duct around col-
lar at bottom of
damper assembly. Also
refer
to the
Submittal Data
Sheets specified for your
unit.
When
connecting
supply air duct to Supply Plenum,
attach duct to
supply air opening flange
when no
dampers
are used. Otherwise,
if dampers are used,
attach supply air
duct around collar at bottom of
damper
assembly. Refer to the
Figure 13.
GAS PIPING
tt
All gas
piping must
be installed in accordance with
local
codes. It
is required that
a
ground union
be
installed
adjacent to
the gas valve of each duct fur-
nace,
and a ground union
be
installed
just
external
of
each duct furnace
for unit servicing. On vertical
runs,
a
drip leg
should
be provided upstream of any
con-
trol
manifold.
A gas shutoff valve should
be,
or may
be required
by local codes, installed upstream
of the
external
ground
union for
each duct furnace. A 1/8
inch
N.P.T. plugged
tapping,
accessible for test
gauge connection,
must be
installed
immediately
upstream
of the unit gas
supply connection.
tt
For complete
Gas Piping
installation, see
Outdoor
Rooftop
Gas-Fired Duct
Furnace
Installation
and Service
Manual.
It is
recommended that
the gas piping
not
be
installed through
the bottom
of the duct furnace
bot-
tom
panel. If piping
must penetrate
the duct
furnace
bottom
panel, it
must be sealed to
prevent water
leakage.
Gas piping
must be installed
to allow
for removal of
burner
drawer for
unit
maintenance. Refer
to Figure 2.
-6-