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8. Install side filter supports using the screws provided.
9. Install side drip angles using the screws provided.
10. Run a continuous length of seal strip across the hood
covering the engagement holes in the lower hood.
11. Install top diverter using the screws provided.
12. On units with barometric relief, remove screws at bot-
tom of relief damper. Do not discard damper door.
Fig. 15 - - Hood Assembly – Completed
Step 8 — Install Flue Hood and Combustion Air
Hood
The flue hood is shipped screwed to the fan deck inside
the burner compartment. Remove the burner access panel
and then remove the flue hood from its shipping location.
Using the screws provided, install flue hood in the
location shown in Fig. 16.
The combustion air hood is attached to the back of the
burner access panel. Remove the two screws securing the
hood to the back of the burner access panel. Using the two
screws, re- - attach the hood to the front of the burner
access panel as shown in Fig. 16.
Combustion
Flue Hood
Air Hood
Fig. 16 - - Flue Hood and Combustion Air Hood Details
Step 9 — 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. In
U.S.A. the input rating for altitudes above 2000 ft (610 m)
must be derated by 4% for each 1000 ft (305 m) above sea
level. In Canada the input rating must be derated by 10%
for altitudes of 2000 ft (610 m) to 4500 ft (1372 m) above
sea level.
For natural gas applications, gas pressure at unit gas
connection must not be less than 5 in. wg (1246 Pa) or
greater than 13 in. wg (3240 Pa) while the unit is
C09090
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.
Gas Supply Line —
The gas supply pipe enters the unit adjacent to the burner
access panel on the front side of the unit, through the
grommeted hole. The gas connection to the unit is made
3
to the
/
- - in. FPT gas inlet port on the unit gas valve.
4
Table 4 lists typical
field supplied pipe fittings required for Thru- - Base gas
supply, starting from the unit gas valve (see Fig. 17).
Pipe gas supply into 90 degree elbow item 15 (see Table 4)
through the hole in the unit basepan.
3
For typical
/
4
for NON Thru- - Base gas supply starting from the unit gas
valve, omit items 14 and 15 from Table 4 and pipe gas
supply into TEE. See Fig. 18.
Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL
580J*
Manifold pressure is factory- - adjusted for NG fuel use.
Adjust as required to obtain best flame characteristics.
Table 3 – Natural Gas Manifold Pressure Ranges
C09091
UNIT MODEL
580J*
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage
to equipment.
When connecting the gas line to the unit gas valve,
the installer MUST use a backup wrench to prevent
damage to the valve.
18
3
/
inch NPT (National Pipe Thread)
4
inch NPT field supplied fittings required
UNIT SIZE
MIN
5.0 in. wg
17, 20, 24, 28, 30
(1246 Pa)
UNIT SIZE
HIGH FIRE
3.0 in. wg
17, 20, 24, 28, 30
(747 Pa)
CAUTION
MAX
13.0 in. wg
(3240 Pa)
LOW FIRE
2.0 in. Wg
(498 Pa)
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