GM9S80 Installation Manual
12
manufacturer’s kits for propane gas and/or high altitude in-
stallations. The indicated kits must be used to insure safe
and proper furnace operation. All conversions must be per-
-
ufacturer’s propane gas conversion kit must be applied for
propane gas installations.
High
Stage
Low
Stage
Natural None
#45 3.5" w.c. 1.9" w.c. None
Propane
1
1.25mm 10.0" w.c. 6.0" w.c. None
Gas
Altitude
Kit
Orifice
Manifold Pressure
Pressure
Switch
0-7000
1
also be installed. The use of this kit will prevent the furnace
support proper combustion.
This unit is equipped with a 24 volt gas valve controlled
during furnace operation by the integrated control module.
regulator spring with a propane gas spring from an appro-
priate manufacturer’s propane gas conversion kit. Taps for
measuring the gas supply pressure and manifold pressure
are provided on the valve.
position. Refer to the lighting instructions label or Startup
Procedure & Adjustment for use of this control during start
up and shut down periods.
When sizing gas lines, be sure to include all appliances
which will operate simultaneously.
The gas piping supplying the furnace must be properly sized
and length of the run. The gas line installation must comply
with local codes, or in their absence, with the latest edition of
Length of Nominal Black Pipe Size
1/2" 3/4" 1" 1 1/4" 1 1/2"
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 980
40 63 130 245 500 760
50 56 115 215 440 670
60 50 105 195 400 610
70 46 96 180 370 560
80 43 90 170 350 530
90 40 84 160 320 490
100 38 79 150 305 460
0.60 Specif ic Gravity Gas)
To connect the furnace to the building’s gas piping, the in-
staller must supply a ground joint union, drip leg, manual
In some cases, the installer may also need to supply a tran-
sition piece from ½” pipe to a larger pipe size.
The following stipulations apply when connecting gas piping.
• Gas piping must be supported external to the furnace
cabinet so that the weight of the gas line does not distort
the burner rack, manifold or gas valve.
•
piping.
•
joint compound must be resistant to the action of the
fuel used.
•
• Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum of
three inches long.
•
the gas valve to keep it from turning. The orientation of
the gas valve on the manifold must be maintained as
shipped from the factory.
•
unit within six feet of the unit. If a union is installed, the
• Tighten all joints securely.
•
following methods:
-
minum alloy tubing must not be used in exterior loca-
tions.
same room as the furnace.
– Protect connectors and semi-rigid tubing against
physical and thermal damage when installed. Ensure
aluminum-alloy tubing and connectors are coated to
protect against external corrosion when in contact
with masonry, plaster, or insulation, or subjected to re-