7
(d) Following the lighting instructions, place the furnace
being inspected in operation. Adjust thermostat so
appliance will operate continuously.
(e) Test for spillage at the draft hood relief opening after 5
minutes of main burner operation; use the flame of a
match or candle.
(f) After it has been determined that each appliance re-
maining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers and
any other gas-burning appliance to their previous con-
ditions of use.
(g) If improper venting is observed during any of the above
tests, the common venting system must be corrected in
accordance with the latest edition of the National Fuel
Gas Code NFPA 54/ANSI Z223.1.
When resizing any portion of the common venting system,
use the appropriate table in Appendix G in the latest edition
of the National Fuel Gas Code NFPA 54/ANSI Z223.1.
Upflow or Horizontal units
are shipped with the induced
draft blower discharging from the top of the furnace. (“Top”
is as viewed for an upflow installation.) The induced draft
blower can be rotated 90 degrees counterclockwise for
Category I venting, with the airflow horizontal left to right
(Figure 5). For horizontal installations, a four inch single
wall pipe can be used to extend the induced draft blower
outlet 1/2” beyond the furnace cabinet. Vent the furnace in
accordance with the National Fuel Gas Code NFPA 54/
ANSI Z223.1 - latest edition. In Canada, vent the furnace
in accordance with the National Standard of Canada, CAN/
CSA B149 - latest editions and amendments.
Supply
Air
Figure 5
Upflow Rotated Induced Draft Blower
Counterflow units
are shipped with the induced draft
blower discharging from the top of the furnace. (“Top” is as
viewed for a counterflow installation.) The induced draft
blower can be rotated 90 degrees counterclockwise for
Category I venting, with the indoor airflow horizontal right to
left (Figure 6). For horizontal venting, a three inch B-vent
pipe can be used to extend the induced draft blower outlet
1/2” beyond the furnace cabinet. Vent the furnace in
accordance with the National Fuel Gas Code NFPA 54/
ANSI Z223.1 - latest edition. In Canada, vent the furnace
in accordance with the National Standard of Canada, CAN/
CSA B149 - latest editions and amendments.
Supply
Air
Return
Air
Vent
Figure 6
Counterflow Rotated Induced Draft Blower
To rotate the induced draft blower counterclockwise pro-
ceed as follows:
1. Disconnect electrical power from furnace.
WARNING
To prevent death or personal injury due to
electrical shock, disconnect electrical
power.
2. Remove the round cutout from the side of the furnace.
Note:
The assembly, starting from the outside, is
induced draft blower, outer gasket, rotation plate, inner
gasket, partition panel (Figure 7).
Hose to
Pressure
Switch
Partition
Panel
(Stationary)
Inner Gasket*
Rotation Plate*
Outer Gasket*
Induced
Draft Blower*
*All can rotate together
Figure 7
Blower Assembly
3. Remove and save the four screws which hold the
rotation plate on the partition panel. Note that one of the
screws which hold the induced draft blower on the
rotation plate needs to be removed.
4. Turn the rotation plate 90 degrees counterclockwise.
The inner gasket must turn with the rotation plate.
5. Reinstall the rotation plate on the partition panel, using
the four screws removed in step 3. Tighten all screws
to provide an airtight seal.
6. Make sure all wires are at least one inch from flue pipe.
Relocate junction box to right side of cabinet if nec-
essary. Refer to
Section VI, Electrical Wiring
for in-
structions.
