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LEFT
HOOD
SIDE
19 1/16"
B
(483mm)
HOOD DIVIDER
Fig. 12 − Economizer Hood Construction
DIVIDER
CLEANABLE
ALUMINUM
FILTER
BAROMETRIC
RELIEF
Fig. 13 − Economizer Filter Installation
Step 9 — Install Flue Hood
Flue hood is shipped screwed to the basepan beside the
burner compartment access panel. Remove from shipping
location and using screws provided, install flue hood and
screen in location shown in Fig. 14. Insert the flue hood's
side flange through the access panel cutout, then rotate the
flue hood until the top and bottom flanges contact the
outside of the access panel; secure flue hood with screws.
Fig. 14 − Flue Hood Details
TOP
PANEL
INDOOR COIL
ACCESS PANEL
SCREW
33 3/8"
(848mm)
C06026
OUTSIDE
AIR
HOOD
FILTER
FILTER
CLIP
C08634
BLOWER
ACCESS
FLUE OPENING
PANEL
C12757
Step 10 — Install Gas Piping
Installation of the gas piping must be accordance with
local building codes and with applicable national codes.
In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel
Gas Code (NFGC). In Canada, installation must be
accordance with the CAN/CSA B149.1 and CAN/CSA
B149.2 installation codes for gas burning appliances.
This unit is factory equipped for use with Natural Gas fuel
at elevations up to 2000 ft (610 m) above sea level. Unit
may be field converted for operation at elevations above
2000 ft (610 m) and/or for use with liquefied petroleum
fuel. See accessory kit installation instructions regarding
these accessories.
NOTE:
Furance gas input rate on rating plate is for
installation up to 2000 ft (610 m) above sea level. The
input rating for altitudes above 2000 ft (610 m) must be
derated by 4% for each 1000 ft (305 m) above sea level.
For natural gas applications, gas pressure at unit gas
connection must not be less than 4 in. wg (996 Pa) or
greater than 13 in. wg (3240 Pa) while the unit is
operating. For liquified petroleum applications, the gas
pressure must not be less than 11 in. wg (2740 Pa) or
greater than 13 in. wg (3240 Pa) at the unit connection.
The gas supply pipe enters the unit at the burner access
panel on the front side of the unit, through the long slot at
the bottom of the access panel. The gas connection to the
1
unit is made to the
/
−in. or
2
the unit gas valve.
Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL
UNIT SIZE
581J*
07, 08, 09, 11, 12
Table 3 – Liquid Propane Supply Line Pressure Ranges
UNIT MODEL
UNIT SIZE
581J*
07, 08, 09, 11, 12
Manifold pressure is factory−adjusted for NG fuel use.
Adjust as required to obtain best flame characteristics.
Table 4 – Natural Gas Manifold Pressure Ranges
UNIT MODEL
UNIT SIZE
581J*
07, 08, 09, 11, 12
}
NOTE-
LOW FIRE, 1.7 in. wg (423 Pa), applies to the following
units only: 581J*07*072/125/150, 581J*08*125 & 581J*09*125
Manifold pressure for LP fuel use must be adjusted to
specified range. Follow instructions in the accessory kit to
make initial readjustment.
Table 5 – Liquid Propane Manifold Pressure Ranges
UNIT MODEL
UNIT SIZE
581J*
07, 08, 09, 11, 12
}
NOTE-
LOW FIRE, 5.0 in. wg (1420 Pa), applies to the following
units only: 581J*07*072/125/150, 581J*08*125 & 581J*09*125
14
3
/
−in. FPT gas inlet port on
4
MIN
MAX
4.0 in. wg
13.0 in. wg
(996 Pa)
(3240 Pa)
MIN
MAX
11.0 in. wg
13.0 in. wg
(2740 Pa)
(3240 Pa)
}
HIGH FIRE
LOW FIRE
3.5 in. wg
2.0 in. wg
(872 Pa)
(498 Pa)
}
HIGH FIRE
LOW FIRE
10.0 in. wg
5.7 in. wg
(2490 Pa)
(1420 Pa)
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