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NOTE:
Side return-air
openings
can ONLY be used in Upflow
configurations.
Install filter(s)
as shown
in Fig. 24.
For bottom
return-air
applications,
filter may need to be cut to fit
some furnace widths.
Install filter as shown
in Fig. 25.
21-iN. (533mm)
WIDE
171/2-1N.(444mm) WIDE
CASINGS
ONLY:
CASINGS
ONLY:
SUPPORT RODS (3)
INSTALL FIELD-SUPPLIED
EXTEND 1/4" (6mm) ON
FILTER FILLER STRIP
EACH SIDE OF FILTER AND
INDER FILTER.
REST ON CASING FLANGE
WASHABLE
FILTER
2. Rotate front filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall front filler panel and screws.
Gas PiDin_
Gas piping nmst be installed in accordance with national and
local codes. Refer to NFGC in the U.S. Canadian installations
must be made in accordance with CAN/CSA-B149.1-05
and all
authorities having jurisdiction.
Gas supply line should be a
separate line running directly from meter to furnace, if possible.
Refer to Table 3 for recommended gas pipe sizing. Risers nmst be
used to connect to furnace and to meter. Support all gas piping
with appropriate
straps, hangers, etc. Use a minimum of one
hanger every 6 ft. (1.8M). Joint compound (pipe dope) should be
applied sparingly and only to male threads of joints. Pipe dope
must be resistant to propane gas.
FIRE
OR EXPLOSION
HAZARD
Failure to follow this warning
could result in personal
iniury, death, or property damage.
- Connect gas pipe to furnace using a backup wrench to
avoid damaging gas controls.
- Gas valve shutoff switch MUST be facing forward or
tilted upward.
- Never purge a gas line into a combustion chamber.
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.
- Use proper length of pipe to avoid stress on gas
control manifold.
- If a flexible connector is required or allowed by
authority having jurisdiction, black iron pipe shall be
installed at furnace gas valve and extend a minimum
of 2 in. (51 ram) outside furnace casing.
-Protect gas valve from water and debris. Gas valve
inlet and/or inlet piping nmst remain capped until gas
supply line is permanently installed to protect the valve
from moisture and debris. Also, install a sediment trap
in the gas supply piping at the inlet to the gas valve.
FILTER
FILTER
RETAINER
SUPPORT
Fig. 25 - Bottom
Filter
Arrangement
A00290
NOTE:
Remove and discard bottom closure panel when bottom
inlet is used.
Bottom Closure Panel
These furnaces are shipped with bottom closure panel installed in
bottom return-air opening. This panel MUST be in place when
side return air is used.
To remove bottom closure panel, perform following:
1. Tilt or raise furnace and remove two screws holding front
filler panel. (See Fig. 26.)
Install
a sediment
trap in riser leading
to furnace.
Trap
can be
installed
by connecting
a tee to riser
leading
to furnace
so
straight-through
section
of tee is vertical.
Then connect
a capped
nipple
into lower end of tee. Capped
nipple
should
extend below
level
of gas controls.
Place
a ground
joint
union
between
gas
control manifold
and manual
gas shutoff valve. (See Fig. 27.)
An accessible
manual
shutoff
valve
MUST
be installed
external
to furnace
casing
and within
6 ft. (1.8M)
of furnace.
A l/8-in.
NPT
(3
ram)
plugged
tapping,
accessible
for
test
gauge
connection,
MUST
be
installed
immediately
upstream
of gas
supply
connection
to furnace
and downstream
of manual
shutoff
valve.
Gas line grommet
(factory-supplied
loose parts bag)
should
be
used when
installing
gas piping.
Gas line entry hole filler plug
should be installed
in unused
gas line entry hole. (See Fig. 28.)
23
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