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8. Reassemble
allparts i nreverse orderas r emoved. Be sureto
engage the main burner orifices i ntheproper opening i nthe
burners.
9. After r eassembling,
turn gasonandcheck a lljoints forgas
leaks u sing asoapy s olution. Allleaks m ust b erepaired im-
mediately.
Gas Piping Requirements
1.
Install gas piping in accordance
with local codes,
or in the ab-
sence of local codes,
the applicable
national
codes.
2.
3.
4.
5.
6.
It is recommended
that a manual
shutoff valve be installed
in
the gas supply
line outside
the unit. Locate
valve as close to
the furnace
as possible
where
it is readily
accessible.
Refer
to Figure
12.
Use black iron or steel pipe and fittings or other pipe ap-
proved by local code.
Use pipe thread
compound
which
is resistant
to natural
and
LP gases.
Install a drip leg no less than 3" long to trap dirt and moisture
before
it can enter gas valve.
Provide
a 1/8" inch plug for test gauge connection
immediate-
ly up stream
of gas supply
connection
to furnace.
Typical Gas Piping
Manual
V_lve
Elbow and
short nipple
Union _
and pipe cap
/
_
L_deen_
/
_._
Gas
Valve
Manuel
Valve
25-21-43c
7.
8.
Use two pipe wrenches
when making
connections
to prevent
gas valve from turning.
Flexible
corrugated
metal gas connector
may NOT be used
inside the furnace
or be secured
or supported
by the furnace
or ductwork.
9.
Properly
size gas pipe to handle
combined
appliance
load or
run gas pipe directly
from gas meter
or LP gas regulator.
10.
Install
correct
pipe size for run length
and furnace
rating.
11.
Measure
pipe length from gas meter or LP second
stage reg-
ulator.
Fire or explosion hazard.
The flexible
corrugated
metal gas connector
must be
properly installed, cannot go through the side of the
furnace, and can not be used inside the furnace.
Failure to properly install metal gas connector can result
in death, bodily injury and/or property damage.
Additional LP Piping Requirements
•
Have a licensed
LP gas dealer
make all connections
at stor-
age tank and check
all connections
from tank to furnace.
•
If copper
tubing is used, it MUST comply
with limitation
set in
Local Codes,
or in the absence
of local codes,
the gas codes
of the country
having
jurisdiction.
•
Two-stage
regulation
of LP gas is recommended.
Final Check
•
Test all pipe for leaks.
•
If orifices
where
changed,
make sure they are checked
for
leaks.
During
pressure
testing
of gas piping
system,
observe
the
following:
a. If test pressure
does not
exceed
1/2"
PSIG, isolate the fur-
nace by closing
its individual
manual
shutoff
valve.
b. If test pressure
exceeds
1/2"
PSIG, the furnace
and its indi-
vidual
shutoff
valve must be disconnected
from the gas sup-
ply system.
To check for leaks apply soap suds or a liquid detergent to
each joint. Bubbles forming indicate a leak.
Do not use an open flame to test for gas leaks. Fire or explo-
sion could occur.
•
Correct
even the smallest
leak at once.
Fire or explosion hazard.
Liquid petroleum (LP) gas is heavier than air and will
settle and remain in low areas and open depressions.
Thoroughly
ventilate area and dissipate gas. Do NOT
use a match or open flame to test for leaks, or attempt to
start up furnace before thoroughly ventilating area.
An open flame or spark can result in death, personal
injury and/or property damage.
_]
441 012603 02
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