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COMBUSTION AND VENTILATION AIR (cont.)
POWER VENT SYSTEMS
When vertical venting is not possible, the only acceptable method
for horizontal venting is with the use of Tjernlund model GPAK-
1TR or Field Controls models SWG-4R power venter. Type B
vent pipe and fittings must be used. Common venting is not per-
mitted
All application and installation instructions supplied with the
power venter must be followed.
Please address all questions regarding power venter installation,
agency listings and furnace model compatibility to:
Tjernlund Products, Inc.
(800) 255-4208 or (612) 426-2993
Field Controls L.L.C.
(800) 742-8368 or (919) 522-0214
EXISTING VENT SYSTEMS
IMPORTANT RETROFIT
VENTING INSTRUCTIONS
If this furnace is a replacement installation, ALWAYS INSPECT
the existing vent system to be sure there are no obstructions,
blockages, or signs of corrosion.
When the existing furnace is removed from a venting system
serving other appliances, the venting is likely to be too large to
properly vent the remaining attached appliances.
The following steps shall be followed with each appliance that re-
mains connected to the common venting system, while the other
appliances that remain connected to the common venting sys-
tems are not in operation.
NOTE: When the vent table permits more than one diameter
of pipe for a connector or vent, the smallest permitted diam-
eter must be used.1. Seal any unused openings in the com-
mon venting system.
NOTE: Ensure existing venting system complies with latest addi-
tion of National Fuel Gas Code ANSI Z223.1 and all local
codes/regulations.
22
1. Visually inspect the venting system for proper size and hori-
zontal pitch and determine that there is no blockage, restric-
tion, leakage, corrosion or other deficiencies which could
cause an unsafe condition.
2. Insofar as is practical, close all building doors, windows and all
doors between the space where the appliances remaining con-
nected to the common venting system are located. Turn on
clothes dryers and any appliance not connected to the com-
mon venting system. Turn on any exhaust fans, such as range
hoods and bathroom exhausts, so they will operate at maxi-
mum speed. Do not operate a summer exhaust fan. Close fire-
place dampers.
3. Follow the lighting instructions. Place the appliance being in-
spected into operation. Adjust the thermostat so the appliance
will operate continuously.
4. 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.
5. After it has been determined that each appliance that remains
connected to the common venting system properly vents
(when tested as outlined above) return doors, windows, ex-
haust fans, fireplace dampers and any other gas-burning appli-
ance to their previous conditions of use.
6. If improper venting is observed during any of the above tests,
the common venting system must be resized. Refer to National
Fuel Gas Code, ANSI Z223.1.
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