# 45464K003Page 12
(see Figure 15). The screws must be re-installed in the
vest panel after the inserts are removed.
Gas supply piping should be installed in accordance with
local codes and the regulations of the utility. Piping must be
of adequate size to prevent undue pressure drop. Consult
the local utility or gas supplier for complete details on special
requirements for sizing gas piping.
If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not use
a connector which has previously serviced another gas
appliance.
Pipe connections must be tight, and a non-hardening pipe
compound resistant to liquefied petroleum gases should
be used.
Connect gas pipe to furnace controls providing a ground joint
union as close to the controls as is possible to facilitate
removal of controls and manifold. Provide a drip leg on the
outside of furnace. A manual shutoff valve shall be installed
To remove the NO
x
inserts, first take out the burners. After
removing the burners, remove the screw holding each
insert and pull the insert from the combustion chamber
When converting a low NO
x
furnace (desig-
nated by an “L” in the model number, such as
G1N80BU100D20CL-1A) to propane, the
NO
x
inserts must be removed. Failure to
remove the inserts can create a situation
where carbon monoxide is produced which
may lead to asphyxiation.
WARNING
Any conversion of a natural gas unit to pro-
pane gas must be done by qualified person-
nel using a conversion kit available from the
manufacturer, following the instructions in the
conversion kit. If done improperly, overfiring of
the burners and improper burner operation
can result. This can create carbon monoxide
which could cause asphyxiation.
WARNING
NO
x
Insert
Location
Figure 15
Table 1
Minimum Filter Requirements
1. The Airflow Descriptor is the two digits following the “D” in
the model number.
2. Areas and dimensions shown for permanent filters are
based on filters rated at 600 feet per minute face velocity.
3. Typical filter sizes are shown; however, any combination
of filters whose area equals or exceeds the minimum
area shown is satisfactory.
wolfriA
rotpircseD
sretliFelbasopsiD sretliFtnenamreP
aerA.niM
).ni.qs(
eziS
).ni(
.ytQ
aerA.niM
).ni.qs(
eziS
).ni(
.ytQ
90084
52x02
1042
02x61
1
01 084
52x02
1 042
02x61
1
21675
02x61
2882
02x61
1
41 276
02x02
2 633
02x02
1
61867
02x02
2483
02x02
1
22,02 069
52x02
2 084
52x02
1
Gas Supply and Piping
Refer to the furnace rating plate to make sure the furnace
is equipped to burn the gas supplied (natural or propane).
Failure to follow the safety warnings exactly
could result in serious injury, death, or prop-
erty damage.
Never test for gas leaks with an open flame.
Use a commercially available soap solution
made specifically for the detection of leaks to
check all connections. A fire or explosion may
result causing property damage, personal
injury, or loss of life.
WARNING
FIRE OR EXPLOSION HAZARD
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