Lennox ELITE Series Installation Instructions Manual page 43

LP/Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes
Natural to
LP/Propane
EL195
Unit
0 − 7500 ft
(0 − 2286m)
−045
−070
−090
−110
−135
* Conversion requires installation of a gas valve manifold spring which is provided with the gas conversion kit.
Pressure switch is factory set. No adjustment necessary. All models use the factory−installed pressure switch from 0−4500 feet (0−1370 m).
Testing for Proper Venting and Sufficient Combustion Air for Non−Direct Vent Applications
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 monox-
ide poisoning or death.
The following steps shall be followed for each ap-
pliance connected to the venting system being
placed into operation, while all other appliances con-
nected to the venting system are not in operation.
After the EL195UH gas furnace has been started, the fol-
lowing test should be conducted to ensure proper venting
and sufficient combustion air has been provided to the
EL195UH as well as to other gas-fired appliances which
are separately vented.
If a EL195UH 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 flue prod-
ucts, the existing vent pipe is probably oversized for the
single water heater or other appliance. The vent should be
checked for proper draw with the remaining appliance.
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
made for sufficient amounts of combustion air, corrections
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
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High Altitude
Natural Burner
Orifice Kit
7501 − 10,000 ft
(2286 − 3038m)
*69W73 73W37
WARNING
search engine
TABLE 12
High Altitude
LP/Propane Burner
Orifice Kit
7501 − 10,000 ft
(2286 − 3038m)
*68W68
horizontal pitch. Determine there is no blockage or re-
striction, leakage, corrosion, or other deficiencies
which could cause an unsafe condition.
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 lo-
cated and other spaces of the building.
4 − Close fireplace dampers.
5 − Turn on clothes dryers and any appliances not con-
nected 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 − Use the flame of match or candle to test for spillage of
flue gases at the draft hood relief opening after 5 min-
utes of main burner operation.
8 − If improper venting is observed during any of the
above tests, the venting system must be corrected or
sufficient combustion/make-up air must be provided.
The venting system should be re-sized to approach
the minimum size as determined by using the ap-
propriate 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 cur-
rent standard of the CSA−B149 Natural Gas and Pro-
pane 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
doors, windows, exhaust fans, fireplace dampers
and any other gas-burning appliance to their previous
condition of use.
Page 43
High Altitude Pressure Switch
4501 − 7500 ft 7501 −10,000 ft
(1373 − 2286m) (2286 − 3048m)
No Change 74W90
77W43 73W22
77W42 73W22
77W43 73W22
77W42 73W22