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TABLE 12
LP/Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes
Unit
Natural to
LP/Propane
High Altitude
Natural Burner
Orifice Kit
High Altitude
LP/Propane
Burner
Orifice Kit
High Altitude Pressure
Switch
High Altitude Pressure
Switch
92AF1UH
95AF1UH
0 − 7500 ft
(0 − 2286 m)
7501 − 10,000 ft
(2286 − 3038m)
7501 − 10,000 ft
(2286 − 3038m)
4501 − 7500 ft
(1373 −
2286m)
7501 −10,000
ft
(2286 −
3048m)
4501 − 7500 ft
(1373−2286m)
7501 −10,000
ft
(2286
−3048m)
−045
*69W73
73W37
*68W68
93W87
93W88
No Change
93W87
−070
93W93
93W86
−090
93W92
−110
93W93
−135
93W92
* 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
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 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 92AF1UH/95AF1UH gas furnace has been
started, the following test should be conducted to ensure
proper venting and sufficient combustion air has been pro-
vided to the 92AF1UH/95AF1UH as well as to other gas-
fired appliances which are separately vented.
If a 92AF1UH/95AF1UH furnace replaces a Category I fur-
nace which was commonly vented with another gas ap-
pliance, the size of the existing vent pipe for that gas ap-
pliance must be checked. Without the heat of the original
furnace flue products, 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 re-
maining 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
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.
