23
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.
WASHABLE
FILTER
FILTER
SUPPORT
FILTER
RETAINER
17
1
⁄
2
-IN. (444mm) WIDE
CASINGS ONLY:
INSTALL FIELD-SUPPLIED
FILTER FILLER STRIP
UNDER FILTER.
1
″
24
1
/
2
″
3
″
21-IN. (533mm) WIDE
CASINGS ONLY:
SUPPORT RODS (3)
EXTEND 1/4" (6mm) ON
EACH SIDE OF FILTER AND
REST ON CASING FLANGE
(76mm)
(533mm)
(25.4mm)
A00290
Fig. 25 -- Bottom Filter Arrangement
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.)
2. Rotate front filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall front filler panel and screws.
Gas Piping
Gas piping must 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 must 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
injury, 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 mm) outside furnace casing.
--Protect gas valve from water and debris. Gas valve
inlet and/or inlet piping must 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.
!
WARNING
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 1/8--in. NPT
(3 mm) 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.)
BOTTOM
CLOSURE
PANEL
FRONT FILLER
PANEL
A93047
Fig. 26 -- Removing Bottom Closure Panel
58MV
C
