Mortex Products Inc. / Fort Worth, TX 76106 G18D Installation Instructions
MODEL TYPE LENGTH PIPE TUBING
MGD OF SIZE SIZE
GAS (FT.) (IN.) (IN. OD)
to 20 1/2 5/8
Natural to 60 1/2 -
60 to 70 - 3/4
to 40 1/2 -
Propane to 70 - 5/8
to 80 1/2 -
to 20 - 5/8
to 50 1/2 -
Natural to 60 - 3/4
70 to 80 3/4 -
to 30 1/2 -
Propane to 60 - 5/8
to 80 1/2 -
to 20 - 5/8
to 50 1/2 -
Natural to 60 - 3/4
77 to 80 3/4 -
to 30 1/2 -
Propane to 60 - 5/8
to 80 1/2 -
to 40 1/2 3/4
Natural to 50 - 3/4
90 to 30 1/2 -
Propane to 40 - 5/8
to 60 1/2 3/4
!
WARNING
!
WARNING
G18D Series Gas Furnace INSTALLATION INSTRUCTIONS
GAS PIPE AND TUBING–MIN SIZES
GAS PRESSURE
TYPE GAS INLET GAS PRESSURE
PRESSURE TO BURNER
Natural 7” W.C. 3-1/2” W.C.
Propane 11” W.C. 10” W.C.
When converting gas control valve from or to
Propane gas, it will be necessary to change the
main burner orifice to prevent an underfired or
overfired condition . The pressure regulator on the
gas control valve must also be converted. See label
on lower furnace compartment for full instructions.
If the gas input to the furnace ie too high due to
excessive pressure, wrong size burner orifice, no
orifice, high altitude, etc., the burner flame will be
sooty especially with Propane gas. This type of
furnace operation can produce carbon monoxide,
which could result in unsafe operation, explosion,
and/or fire and asphyxiation.
Should overheadeating occur, or the gas supply fail
to shut off, shut off the manual gas valve to the
furnace and allow burner to run until furance cools
down and blower shuts off before shutting off
electrical supply.
Operation — Once system gas piping has been checked
for leaks, operation the furnace using the lighting
instructions on the front furance panel, and:
1. Observe burner through viewport and make sure it
ignites. The color of the flame when operating on
natural gas will burn blue with yellow tips. On
Propane, a significantly yellow flame can be
expected. If flame is not the proper color call a
qualified service technician for service.
2. Let furnace operate until blower cycles on. This takes
about 2 to 2 1/2 minutes.
3. Turn thermostat down.
4. Observe burner to make sure it has shut off.
5. Let furnace cool and blower cycle off.
10
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