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LEFT
HOOD
SIDE
Fig. 16 — Economizer Hood Construction
DIVIDER
CLEANABLE
ALUMINUM
FILTER
BAROMETRIC
RELIEF
Fig. 17 — Economizer Filter Installation
Step 9 — Install Flue Hood
The flue hood is shipped screwed to the basepan beside the
burner compartment access panel. Remove the panel below the
control box access panel to access the flue hood shipping loca-
tion. Using screws provided, install flue hood and screen in lo-
cation shown in Fig. 18.
TOP
PANEL
INDOOR COIL
ACCESS PANEL
SCREW
HOOD DIVIDER
OUTSIDE
AIR
HOOD
FILTER
FILTER
CLIP
Fig. 18 — Flue Hood Details
Step 10 — Install Gas Piping
Installation of the gas piping must be in accordance with local
building codes and with applicable national codes. In U.S.A., re-
fer to NFPA 54/ANSI Z223.1 National Fuel Gas Code (NFGC).
In Canada, installation must be in 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 (NG) 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 (LP) fuel. See accessory
kit installation instructions regarding these accessories.
NOTE: 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 connec-
tion must not be less than 5 in. wg (1250 Pa) or greater than
13 in. wg (3240 Pa) while the unit is operating (see Table 3).
For liquified petroleum (LP) 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 (see Table 4).
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 unit is
made to the
3
/
-in. FPT gas inlet port on the unit gas valve.
4
Manifold pressure is factory-adjusted for NG fuel use. Adjust
as required to obtain best flame characteristics. See Table 5.
Manifold pressure for liquid propane fuel use must be adjusted
to specified range. Follow instructions in the accessory kit to
make initial readjustment. See Table 6.
Table 3 — Natural Gas Supply Line Pressure Ranges
UNIT
581J*14
5.0 in. wg (1250 Pa)
Table 4 — Liquid Propane Supply Line Pressure Ranges
UNIT
581J*14
11.0 in. wg (2740 Pa)
Table 5 — Natural Gas Manifold Pressure Ranges
UNIT MODEL
581J*14
3.5 in. wg (872 Pa)
13
CONTROL BOX
ACCESS PANEL
FLUE
HOOD
MIN
MAX
13.0 in. wg (3240 Pa)
MIN
MAX
13.0 in. wg (3240 Pa)
HIGH FIRE
LOW FIRE
2.0 in. wg (498 Pa)
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