Trane GRAA - Mounting and Location Details; Mounting Options; VFD Temperature Considerations

CAUTION : Do not over - tighten the inlet gas
pip-
ing at unit gas valve
or stresses
that
could
crack
the valve
may result .
The
gas
line
should be supported
so
that no strain is
placed on the unit.
Pipe
compounds which are not
soluble to liquid petroleum gases must be used on
threaded joints.
The appliance and its individual shutoff valve must
be disconnected from
the gas
supply piping system
during any pressure testing of that system at test
pressures
in excess of 1/2 psig (3.5 kPa).
The
appliance must
be isolated
from the
gas
supply
piping
system
by
closing the individual manual shut-
off
valve during
any pressure testing of
the
gas
sup-
ply piping
system at test pressures equal to or
less
than
1/2 psig
(3.5
kPa).
;
For
additional gas piping information, including
pipe
sizing and drip
leg installation, refer to
Outdoor
Rooftop
Gas-Fired Duct
Furnace
Installation
and
Service
Manual.
For
additional piping
information, refer to
the
National
Fuel
Gas Code
Z233.1
(latest edition).
NOTE : If
the
gas
duct furnace is to
be
fired with
LP
gas , consult local LP
gas dealer for
pip i ng
size
information
.
NOTE : UNIT INSTALLATION FOR USE WITH
PROPANE
(BOTTLED)
GAS MUST
BE MADE BY
A QUALIFIED
LP GAS DEALER OR
INSTALLER .
HE WILL
INSURE PROPER JOINT COMPOUNDS
ARE USED FOR
MAKING PIPE
CONNECTIONS
;
THAT AIR IS
PURGED
FROM
LINES
;
THAT A
THOROUGH
TEST
IS
MADE FOR LEAKS
BEFORE OPERATING
THE
UNIT ; AND THAT IT IS
PROPERLY CONNECTED
TO PROPANE GAS
SUPPLY
SYSTEM
.
Before
any
connection is made to an
existing line
supplying other gas appliances,
contact the local gas
company to make certain
that the existing line
is
of
adequate size to handle
the combined load.
Check all connections for leaks
with soap solution.
MODULATING GAS CONTROL
(OPT
I
ONAL) *
Mechanic
a
l :
On units
equipped
with
mechanical
modulating
gas
control,
the
temperature
sensing
bulb for the gas valve must be
field installed
in the
supply plenum. Carefully uncoil the
capillary tubing
to prevent kinking or sharp bends.
CAUTION: Do not
bend
the
capillary tubing with-
in
1/2"
(12.7
mm) of
the connection
to the bulb or
the valve. Repeated bending may
cause the tub-
ing
to leak or
break.
Center and fasten
the temperature sensing bulb in
the
supply
duct at least 2 inches below
the last duct
furnace section. See
Figure 5.
Figure
5
Electronic
:
On units (natural gas only)
equipped
with electronic modulating control, follow control
manufacturer's installation
instructions
for
sensing of
outlet air temperature.
* Also
refer
to
the Outdoor Duct
Furnace
Installation Manual supplied with your unit.
-8-
Caution:
Do not rely on
a
gas shutoff
valve
to
iso-
late the
unit while conducting gas pressure/leak
tests. These valves may not
be
completely
shut-
off,
exposing
the
unit
gas
valve to excessive
pressure, resulting
in
damage.