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SCREW
LEFT
HOOD
SIDE
Fig. 16 — Economizer Hood Construction
3. Remove the shipping tape holding the economizer baro-
metric relief damper in place.
4. Insert the hood divider between the hood sides. See
Fig. 16 and 17. Secure hood divider with 3 screws on each
hood side. The hood divider is also used as the bottom fil-
ter rack for the aluminum filter.
5. Attach the post that separates the filters with the screws
provided.
6. Open the filter clips which are located underneath the
hood top. Insert the aluminum filters into the bottom filter
rack (hood divider). Push the filter into position past the
open filter clips. Close the filter clips to lock the filters
into place. See Fig. 17.
7. Install the two rain deflectors on the edge of the hood top
as shown in Fig. 15.
DIVIDER
CLEANABLE
ALUMINUM
FILTER
BAROMETRIC
RELIEF
Fig. 17 — Economizer Filter Installation
8. Caulk the ends of the joint between the unit top panel and
the hood top as shown in Fig. 15.
9. Replace the filter access panel.
All manuals and user guides at all-guides.com
TOP
PANEL
INDOOR COIL
ACCESS PANEL
HOOD DIVIDER
OUTSIDE
AIR
HOOD
FILTER
FILTER
CLIP
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 location. Using
screws provided, install flue hood and screen in location shown in
Fig. 18.
Fig. 18 — Flue Hood Details
Step 10 — Install Gas Piping
Installation of the gas piping must be accordance with local build-
ing codes and with applicable national codes. In U.S.A., refer to
NFPA 54/ANSI Z223.1 National Fuel Gas Code (NFGC). In Can-
ada, installation must be accordance with the CAN/CSA B149.1
and CAN/CSA B149.2 installation codes for gas burning appli-
ances.
This unit is factory equipped for use with natural gas fuel at eleva-
tions up to 2000 ft (610 m) above sea level. Unit may be field con-
verted for operation at elevations above 2000 ft (610 m) and/or for
use with liquefied petroleum fuel. See accessory kit installation in-
structions regarding these accessories.
NOTE: 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.
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 (see Table 3). 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 (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
FPT gas inlet port on the unit gas valve.
Table 3 — Natural Gas Supply Line Pressure Ranges
UNIT
4.0 in. wg (996 Pa)
48LC*008/09/12
Table 4 — Liquid Propane Supply Line
Pressure Ranges
UNIT
11.0 in. wg (2740 Pa) 13.0 in. wg (3240 Pa)
48LC*008/09/12
Manifold pressure is factory-adjusted for natural gas (NG) fuel
use. Adjust as required to obtain best flame characteristics. See
Table 5.
Manifold pressure for liquid propane (LP) fuel must be adjusted to
specified range. Follow instructions in the accessory kit to make
initial readjustment. See Table 6.
15
I/O FLEX 6126
CONTROLLER LOCATION
MIN
MAX
13.0 in. wg (3240 Pa)
MIN
MAX
/
-in.
3
4
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