Instruction manual

11
All installations must be vented in accordance with National Fuel
Gas Code NFPA 54/ANSI Z223.1 - latest edition. In Canada, the
furnaces must be vented in accordance with the National Stan-
dard of Canada, CAN/CSA B149.1 and CAN/CSA B149.2 - latest
editions and amendments.
NOTE: The vertical height of the Category I venting system must
be at least as great as the horizontal length of the venting system.
WARNING
T
O PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,
COMMON VENTING WITH OTHER MANUFACTURER'S INDUCED DRAFT APPLIANCS
IS NOT ALLOWED.
Common venting with specific Category I 80% furnaces is allowed
with the addition of a common vent kit (CVK) for each appliance.
Contact the local installing dealer, distributor or us directly for more
information.
The minimum vent diameter for the Category I venting system is
as shown below:
MINIMUM VENT DIAMETER
MODEL GUI* GCI*
45 3 Inch 4 Inch
70 4 Inch 4 Inch
90 4 Inch 4 Inch
115 5 Inch 5 Inch
140 5 Inch 5 Inch
Under some conditions, larger vents than those shown above may
be required or allowed.
When an existing furnace is removed from a venting system serv-
ing other appliances, the venting system may be too large to prop-
erly vent the remaining attached appliances.
The following steps shall be followed with each appliance remain-
ing connected to the common venting system placed in operation,
while the other appliances remaining connected to the common
venting system are not in operation.
(a) Seal any unused openings in the common venting system.
(b) Visually inspect the venting system for proper size and
horizontal pitch as required in the National Fuel Gas Code
NFPA 54/ANSI Z223.1, or the CAN/CSA B149.1 and CAN/
CSA B149.2 Installation Codes and these instructions.
Determine there is no blockage or restriction, leakage,
corrosion or other deficiencies which could cause an unsafe
condition.
(c) Where practical, close all building doors, windows, and all
doors between the space where the appliances remain
connected to the common venting system are located and
other spaces of the building. Turn on all gas appliances not
connected to the common venting system and operate on
high speed all exhaust fans (range hoods and bathroom),
except summer exhaust fans. Close fireplace dampers.
(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, or smoke from a cigarette, cigar, or pipe.
(f) After it has been determined that each appliance remaining
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 conditions 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 air-
flow horizontal left to right (Figure 3). 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 B149.1 and CAN/CSA
B149.2 - latest editions and amendments.
Supply
Air
Figure 3 - Upflow Rotated Induced Draft Blower
Counterflow units are shipped with the induced draft blower dis-
charging from the top of the furnace. (“Top” as viewed for a coun-
terflow installation.) The induced draft blower can be rotated 90
degrees counterclockwise for Category I venting, with the airflow
horizontal right to left (Figure 4). For horizontal installations, 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 B149.1 AND CAN/
CSA B149.2 - latest editions and amendments.
Supply
Air
Return
Air
Vent
Figure 4 - Counterflow Rotated Induced Draft Blower