035-14527-000 REV A (599)
Form 650.77-N3U
Unitary Products Group
9
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 clothes dryers and any appli-
ance not connected to the venting 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.
DUCTWORK
The duct system's design and installation must:
1.
Handle an air volume appropriate for the served space
and within the operating parameters of the furnace spec-
ifications.
2.
Be installed in accordance with standards of NFPA
(National Fire Protection Association) as outlined in
NFPA pamphlets 90A and 90B - (latest editions).
3.
Create a closed duct system. The supply system must
be connected to the furnace outlet and the return duct
system must be connected to the furnace inlet. Both sup-
ply and return duct systems must terminate outside the
space containing the furnace.
4.
Generally complete a path for heated or cooled air to cir-
culate through the air conditioning and heating equip-
ment and to and from the conditioned space.
When the furnace is used in conjunction with a cooling coil,
the furnace must be installed parallel with, or on the upstream
side of the cooling unit to avoid condensation in the primary
heat exchanger.
When a parallel flow arrangement is used, the dampers or
other means used to control air flow must be adequate to pre-
vent chilled air from entering the furnace, and if manually
operated, must be equipped with means to prevent operating
of either unit unless the damper is in the full heat or cool posi-
tion.
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 edi-
tions.
The cooling coil must be installed in the supply air
duct downstream of the furnace.
