035-17438-001 Rev. A (901)
6
Unitary Products Group
VENT SAFETY CHECK PROCEDURE
The following steps shall be followed with each appliance
connected to the venting system placed in operation, while
any other appliances connected to the common venting sys-
tem are not in operation.
1.
Seal any unused openings in the common venting sys-
tem.
2.
Inspect venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code ANSI
Z223.1 or the CAN/CGA B149 Installation Codes and
these instructions. Determine that there is no blockage
or restriction, leakage, corrosion or other deficiencies
which could cause an unsafe condition.
3.
Insofar as is practical, close all building doors and win-
dows and all doors between the space in which the appli-
ance(s) connected to the venting system are located and
other spaces of the building. Turn on clothes dryers and
any other appliances not connected to the common vent-
ing system.
Turn on any exhaust fans, such as range hoods and
bathroom exhausts so they will operate at maximum
speed. Do not operate a summer exhaust fan. Close fire-
place dampers.
4.
Follow the lighting instructions. Place the appliance
being operated in operation. Adjust thermostat so appli-
ance will operate continuously.
5.
Test for draft hood equipped appliance spillage at the
draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle.
6.
After it has been determined that each appliance con-
nected to the 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.
7.
If improper venting is observed during any of the above
tests, the venting system must be corrected.
8.
Any corrections or resizing of the common venting sys-
tem must be in accordance with the National Fuel Gas
Code, ANSI Z223.1 or Section 7, Venting Systems and
Air Supply for Appliances, CAN/CGA B149.1 or .2 Instal-
lation Code latest editions. If the common vent system
must be resized, it should be resized to approach the
minimum size as determined using the appropriate
tables in Appendix G of the above codes or the venting
tables supplied with the furnace.
If this furnace is replacing a common vented fur-
nace, it may be necessary to resize the existing
vent line and chimney to prevent oversizing prob-
lems for the new combination of units. Refer to the
National Fuel Gas Code, ANSI Z223.1 or CAN/
CGA B149.1 or .2 Installation Code latest editions.
