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Junction Box Relocation
Edges of sheet metal holes may be sharp. Use gloves as a
precaution when removing plugs.
To prevent personal injury, electrical shock, disconnect
electrical power before installing or servicing thus unit.
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. Check the location of the wiring. Confirm that it will
not be damaged by heat from the burners or by the
rotation of the fan. Also confirm that wiring location will
not interfere with fil ter removal or other maintenance.
IMPORTANT NOTE: To avoid possible equipment
malfunction, route the low voltage wires to
avoid interference with filter removal or other
maintenance.
HIGH VOLTAGE
To avoid the risk of injury, electrical shock
or death, the furnace must be electrically
grounded in accordance with local codes or
in their absence, with the latest edition of the
National Electric Code.
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. NOTE:
Do not use gas piping as an electrical ground. To confirm
proper unit grounding, turn off the electrical power and
perform 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
for servicing. Do not defeat this switch.
GAS SUPPLY AND PIPING
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
conversion kits required for alternate fuels and/or high altitude.
To prevent unreliable operation or equipment damage, the
inlet gas supply pressure must be as specified on the unit
rating plate with all other household gas fired appliances
operating.
WARNING
WARNING
WARNING
CAUTION
Inlet gas supply pressures must be maintained within the
ranges specified in the following table. The supply pressure
must be constant and available with all other household
gas fired appliances operating. The minimum gas supply
pressure must be maintained to prevent unreliable ignition.
The maximum must not be exceeded to prevent unit
overfiring.
NOTE: Do not remove the gas valve inlet plug
before the gas line is installed. Replace if water
or debris has been introduced.
INLET GAS SUPPLY PRESSURE
Natural Gas
Minimum: 4.5" w.c.
Propane Gas
Minimum: 11.0" w.c.
NOTE: 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 shown on the rating
plate. Overfiring of the fur nace can result in
premature heat exchanger failure. Gas pressures
in excess of 13 inch es water column can also cause
permanent damage to the gas valve.
At all altitudes, the manifold pressure must be within 0.3
inches w.c. of that listed in the Specification Sheet applicable
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
factory authorized LP conversion kit.
High Altitude Derate
High altitude installations may require both a pressure
switch and an orifice change. These changes are necessary
to compensate for the natural reduction in the density of
both the gas fuel and the combustion air at higher altitude.
Clearance in accordance with local installation codes, the
requirements of the gas supplier and the manufacturer's
installation instructions.
Dégaugement conforme aux dodes d'installation locaux,
aux exigences du fournisseur de gaz et aux instructions
d'installation du fabricant.
Gas
Altitude
Kit
Natural
None
0-7000
LPM-06 H/W
Propane
GAS VALVE
LPM-08 W-R
Propane 0-7000
VALVE
NOTE: In Canada, gas furnaces are only certified to 4500 feet.
Consult the furnace Specification Sheet for appropriate
manufacturer's kits for propane gas and/or high altitude
installations. The indicated kits must be used to insure
safe and proper furnace operation. All conversions must be
performed by a qualified installer, or service agency.
11
Maximum: 10.0" w.c.
Maximum: 13.0" w.c.
Manifold Pressure
Orifice
High Stage Low Stage
#45
3.5" w.c.
1.9" w.c.
#55
10.0" w.c.
6.0" w.c.
#55
10.0" w.c.
6.0" w.c.
Pressure
Switch Change
None
None
None
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