GM9S80 Installation Manual
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1. Remove both doors from the furnace.
2. Remove and save the screws holding the junc tion box
to the right side of the furnace.
3. Attach the junction box to the left side of the fur nace,
using the screws removed in step 2.
4.
damaged by heat from the burners or by the rotation of
To avoid possible equipment malfunc-
tion, route the low voltage wires to avoid interference with
To ensure proper unit grounding, the ground wire should run
from the furnace ground screw located inside the furnace
junction box all the way back to the electrical panel.
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form the following check.
1. Measure resistance between the neutral (white)
connection and one of the burners.
2. Resistance should measure 10 ohms or less.
This furnace is equipped with a blower door interlock switch
which interrupts unit voltage when the blower door is opened
The furnace rating plate includes the approved furnace gas
input rating and gas types. The furnace must be equipped to
operate on the type of gas applied. This includes any con-
version kits required for alternate fuels and/or high altitude.
Inlet gas supply pressures must be maintained within the
must be constant and available with all other household gas
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sure must be maintained to prevent unreliable ignition. The
gas line is installed. Replace if water or debris has been
introduced.
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
Adjusting the minimum supply pressure below the
limits in the above table could lead to unreliable ignition.
Gas input to the burners must not exceed the rated input
-
sult in premature heat exchanger failure. Gas pressures in
excess of 13 inch es water column can also cause perma-
nent damage to the gas valve.
At all altitudes, the manifold pressure must be within 0.3
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ble to your model for the fuel used. At all altitudes and with
either fuel, the air tempera ture rise must be within the range
listed on the furnace nameplate. Should this appliance be
converted to LP, refer to the instructions included in the fac-
tory authorized LP conversion kit.
When this furnace is installed at high altitude, the appropri-
due to the natural reduction in the density of both the gas
fuel and combustion air as altitude increases. The kit will
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High altitude kits are purchased according to the installation
derate the furnace by adjusting the manifold pressure
The combination of the lower air density and a lower manifold
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er amount of air into the burner. This may cause incomplete
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content of the
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