Conversion - Nordyne M2RC-080 Installation Instructions Manual

CONVERSION
This furnace can be converted from the factory-
equipped gas to either natural gas (for LP gas
ready models), or LP gas (for natural gas ready
models). Conversions must be made by quali-
filed service personnel, using only factory autho-
dzed or approved parts. The required conver-
sion orifices are supplied with the furnace.
/ WARNING:
DO NOT REMOVE OR DEFACE THE
ORIGINAL RATING PLATE.
CAUTION:
The gas supply shall be shut off prior to
disconnecting the electrical power,
before proceeding with the conversion.
To Turn Off Fuel Supply to the Appliance:
1. Set the room thermostat to "OFF" or its
lowest temperature setting.
2. Turn OFF the main gas supply to the
appliance at the manual valve, outside of
the appliance casing.
3. Remove the control access panel / Iou-
vered door.
4. Move the appliance gas valve lever/knob
to the "OFF" position.
5. Turn OFF the electrical power to the
appliance.
To Remove the Burner Assembly:
1. Follow the instructions "To Turn Off the
Fuel Supply to the Appliance."
2. Disconnect the flame sensor wire from
the burner box.
3. Disconnect the igniter wires at the 2 pin
plug. This is a locking quick connect and
both sides of the lower section must be
depressed in order to be separated.
4. Remove the wires from the terminals of
the gas valve.
5. Disconnect the rubber pressure tubes
from the gas valve and the burner box.
6. Remove the burner access cover plate
from the burner box.
7. Remove supply gas piping from the gas
valve.
8. Carefully remove the burner assembly fas-
teners and remove the bumer assembly from
the appliance. Keep the fasteners that were
removed. Note that the burner box may have
hooks near the top and on the right and left
hand sides. To remove this type of bumer
box, lift the burner box upwards and then
remove the box from the unit.
EXAMPLE 1
EXAMPLE 2
Elevation
Type of gas
Furnace model
Odfice as shipped
3,890 feet
Natural
M2RC-100A-16-BN
#45 Ddll
What burner odfices are needed?
The required input for 3890 feet is 84,000
Btuh or 16% less than the sea level rating
of 100,000 Btuh.
See Table 8 for natural gas, find the Furnace
Model Number and follow across the table for
the elevation 2000-4000 column. From the
table, choose a #46 orifice. Install a #46 orifice
in every burner and check the fidng rate per the
VERIFYING AND ADJUSTING FIRING RATE
section. The fidng rate in this example must not
exceed 84,000 Btuh.
Elevation
Type of gas
Furnace model
Orifice in Natural to
LP Conversion Kit
5,500 feet
Propane
M2RC-100A-16-BN
# 55 drill
What burner odfices are needed?
The required input for 5500 feet is 76,000
Btuh or 24% less than the sea level rating
of 100,000 Btuh.
See Table 8 for LP gas, find the Furnace Model
Number and follow across the table for the
elevation 4000-6000 column. From the table,
choose a #56 orifice, install a #56 odfice in
every burner and adjust the manifold pressure
to 10.0 inches water column. The fidng rate in
this example must not exceed 76,000 Btuh.
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