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Apply Seal Strip
to the front of
this flange
Apply Seal Strips
to the back of
these flanges
2
4
5
6
Seal Strips
Item #
1
2
3
4
5
6
7
Fig. 12 - - Hood Part Identification and Seal Strip
Application Areas
4. Secure side plates to panel using the screws provided.
5. Apply seal strip to mating flange of the hood (see
Fig. 12).
6. On size 17, 20 and 24 units, remove screws across top
cover. Attach hood to side plates. (On these units the
hood flange slides behind flange of top cover.)
7. On size 17, 20 and 24 units, secure the top flang us-
ing the screws removed in step 6. On size 28 units,
secure top flange using screws provided in kit.
8. Install outdoor air screens by sliding them into the
channel formed by the four angles installed in step 2.
Make sure that the screens extend a across the entire
length of the hood.
9. Install side filter supports using the screws provided.
10. Install side drip angles using the screws provided.
11. Run a continuous length of seal strip across the hood
covering the engagement holes in the lower hood.
12. Install top diverter using the screws provided.
13. On units with barometric relief, remove screws at bot-
tom of relief damper. Do not discard damper door.
Fig. 13 - - Hood Assembly – Completed
Step 9 — 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. 14.
The combustion air hood is attached to the back of the
burner access panel. Remove the two screws securing the
Apply Seal Strips
3
to the back of
Apply Seal Strip
these surfaces
to the front of
this flange
7
7
4
4
4
Apply Seal Strip
to the back of
this flange
1
Description
Qty
Angles
4
Side Plates
2
Hood
1
Outdoor Air Screens
4
Side Filter Supports
2
Side Drip Angles
2
Top Diverters
2
C09079
C09090
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. 14.
2
5
6
Combustion
Air Hood
Fig. 14 - - Flue Hood and Combustion Air Hood Details
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. 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
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 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. See
4
580J Gas Heat/Electric Cooling Packaged Rooftop 15 to
25 Nominal Tons Product Data for complete details.
Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL
UNIT SIZE
580J***D
17, 20, 24, 28
13
Flue Hood
MIN
5.0 in. wg
13.0 in. wg
(1246 Pa)
(3240 Pa)
C09091
MAX
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