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Testing for Proper Venting and Sucient Combustion Air for Non-Direct Vent Applications
WARNING
CARBON MONOXIDE POISONING HAZARD!
Failure to follow the steps outlined below for each
appliance connected to the venting system being placed
into operation could result in carbon monoxide poisoning
or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation.
After the EL297UHV gas furnace has been started, the
following test should be conducted to ensure proper vent-
are separately vented.
If a EL297UHV furnace replaces a Category I furnace
which was commonly vented with another gas appliance,
the size of the existing vent pipe for that gas appliance
must be checked. Without the heat of the original furnace
for the single water heater or other appliance. The vent
should be checked for proper draw with the remaining ap-
pliance.
The test should be conducted while all appliances (both
in operation and those not in operation) are connected to
the venting system being tested. If the venting system has
been installed improperly, or if provisions have not been
must be made as outlined in the previous section.
1 - Seal any unused openings in the venting system.
2 - Visually inspect the venting system for proper
size and horizontal pitch. Determine there is no
blockage or restriction, leakage, corrosion, or other
3 - To the extent that it is practical, close all building
doors and windows and all doors between the
space in which the appliances connected to the
venting system are located and other spaces of the
building.
4 -
5 - Turn on clothes dryers and any appliances 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.
6 - Follow the lighting instruction to place the appliance
being inspected into operation. Adjust thermostat
so appliance will operate continuously.
7 -
minutes of main burner operation.
8 - If improper venting is observed during any of the
above tests, the venting system must be corrected
provided. The venting system should be re-sized
to approach the minimum size as determined by
using the appropriate tables in appendix G in the
current standards of the National Fuel Gas Code
ANSI-Z223.1/NPFA 54 in the U.S.A., and the
appropriate Natural Gas and Propane appliances
venting sizing tables in the current standard of the
CSA-B149 Natural Gas and Propane Installation
Codes in Canada.
9 - After determining that each appliance remaining
connected to the common venting system properly
vents when tested as indicated in step 3, return
and any other gas-burning appliance to their
previous condition of use.
Repair Parts
The following repair parts are available through Lennox
dealers. When ordering parts, include the complete fur-
nace model number listed on the CSA nameplate -- Ex-
ample: EL297UHV045P24B-01. All service must be per-
formed by a licensed professional installer (or equivalent),
service agency, or gas supplier.
Cabinet Parts
Outer access panel
Blower access panel
Top Cap
Control Panel Parts
Transformer
Integrated control board
Door interlock switch
Blower Parts
Blower wheel
Motor
Motor mounting frame
Motor control
Heating Parts
Flame Sensor
Heat exchanger assembly
Gas manifold
Combustion air inducer
Gas valve
Main burner cluster
Pressure switch
Ignitor
Primary limit control
Flame rollout switches
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