High Altitude Input Rate =
Nameplate Sea Level Input Rate x (Multiplier) [USA]
High Altitude MultiplierElevation
ft (m)
2001' - 3000'
(609.9 - 914.4)
3001' - 4000'
(914.7 - 1219.2)
4001' - 5000'
(1219.5 - 1524)
5001' - 6000'
(1524.3 - 1828.8)
6001' - 7000'
(1829.1 - 2133.6)
7001' - 8000'
(2133.9 - 2438.4)
Natural Gas Propane Gas
0.95 0.90
0.93 0.86
0.91 0.82
0.89 0.78
0.87 0.74
0.85 0.70
* Based on mid-range of elevation.
4. In cases where Table 9 or Table 10 is not applicable, eg.
alternate input rate application, refer to Table 11 or
Table 12 for required high altitude input rate.
HighAltitudeAir PressureSwitch
Altitudes over 4,000' (1219.2m) may require a different air
pressure switch than the one installed at the factory. Check parts
list for pressure switch and consult your distributor for part number
and availability. In Canada, provincial codes may govern
installation of switch. Check with governing authorities.
ChangingOrificesfor HighAltitude
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Turn OFF electric power at fuse box or service
panel and gas supply at manual valve in gas valve,
lockout and tag switch with a suitable warning
label, when installing orifices. Installation of
orifices requires a qualified service technician.
NOTE: Main burner orifices can be changed for high altitudes.
1. Disconnect gas line from gas valve.
2. Remove manifold from furnace.
3. Remove the orifices from the manifold and replace them
with properly sized orifices.
4. Tighten orifices so it is seated and gas tight. (See
Figure 33)
5. Reinstall manifold. Ensure burners do NOT bind on new
orifices.
Changing Orifices
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Measure from face of orifice
NaturalGas InputRatingCheck
SEE CHECKS AND ADJUSTMENTS, Natural Gas Input Rating
Check in this manual.
FinalGas PipingCheck
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made
specifically for the detection of leaks to check all
connections. A fire or explosion could result
causing property damage, personal injury and/or
loss of life.
1. The furnace and the equipment shut off valve must be
disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess
of 1/2_" PSIG. Close the manual shut-off valve before testing
at such pressures.
2. When installation is complete, test all pipe connections for
leaks with the gas pressure less than 1/2_" PSIG to the gas
valve.
3. The furnace must be isolated from the gas supply system by
closing the equipment shut off valve during any pressure
testing of the gas supply system at test pressure equal to or
less than 1/2" PSI.
4. Apply a commercial soap solution to all joints to test for
leaks. Correct any leaks indicated by bubbles.
5. Correct even the smallest leak at once.
6. Check for leaks at gas valve and orifice connections to the
burner manifold while the furnace is operating.
RISQUE D'INDENDIE OU D'EXPLOSION
Le non-respect des avertissements de securite
pourrait d'entrainer des blessures graves, la mort
ou des dommages materiels.
Ne jamais utiliser une flamme nue pot verifier la
presence des fuites de gaz. Pour la verification de
tous les joints, utiliser plut6t une solution
savonneuse commerciale fabriquee
specifiquement pur la detection des fuites de gaz.
Un incendie ou une explosion peut entrainer des
dommages materiels, des blessures ou la mort.
440 01102404
Specifications are subject to change without notice
37
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