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CG15, CG25, CG50 Burner Manual
Figure 7 - Typical Gas Piping Layout
Gas Trains
to Furnace Pressure Drop curves of Figures 14A, 14B,
and 14C are correct for both propane and natural gas.
That is also why a gas train adjusted for the burner’s
natural gas requirements will be correctly adjusted for
its propane requirements. R. W. Beckett provides the
same pressure regulating safety shutoff valve in the gas
train (usually a Honeywell V4944B) for both natural gas
and propane. The valve is marked for natural gas due
to its primary usage in a pressure range normally used
by natural gas appliances. It is safe and effective for
propane usage in this design application.
Optional – Gas trains for IRI and FM are available and
must be specifi ed when ordering a burner.
Verify – Verify that the train components are not
damaged and all piping and fi ttings are clean inside and
out. The gas train is normally shipped as components
and must be assembled and installed at the site.
Vent Lines – Install vent lines to any gas valve
component that requires atmospheric air pressure to
balance a diaphragm. Vent lines must be run to the
outdoors, with the termination point away from fresh
air intakes and windows. The terminal opening must
be fi tted with a wire mesh screen to block insects and
other contaminants from entering the vent and must
be mounted in such a position that water, ice, dirt, or
any other foreign matter cannot infi ltrate and block the
vent piping. Make sure the fi nal assembly is anchored
securely.
LGPS
HGPS
S
(IF USED)
DRIP LEG
BURNER
METER
MSC
SSOV1
2PRV
MLTC
U
TC
U
TC
TC
U
PG
REGULATOR
ABBREV.
HGPS
LGPS
MSC
MLTC
PG
S
SSOV1
TC
U
2PRV
ITEM DESCRIPTION
HIGH GAS PRESSURE SWITCH
LOW GAS PRESSURE SWITCH
MAIN SHUTOFF COCK
MAIN LEAK TEST COCK
PRESSURE GAUGE
STRAINER
SAFETY SHUTOFF VALVE #1
TEST COCK
UNION
TWO POSITION REGULATING VALVE
GAS UTILITY PIPING
FACILITY PIPING
GAS TRAIN BURNER
Install a Drip Leg in Gas
Supply Piping
Foreign matter could lodge in gas valve
cutoff seals, resulting in gas leak-through,
explosion or fi re.
Install a full-size drip leg or dirt pocket in the piping
directly ahead of the main shutoff valve to capture
foreign matter.
Section: Connect Gas Piping
Gas Leaks and Explosion
Hazards
Provide Over-pressure Protection
CSD-1 requires that if gas pressure entering the building
exceeds the rating of any gas train component an
overpressure protection device must be installed.
Standard – An Underwriters Laboratories (UL) listed
gas train is standard for the CG10 gas burner. This
confi guration also meets CSD-1 requirements. See
Figures 8A and 8B for typical component layout.
Propane (LP) – When the correct propane restrictor
is added to a burner’s gas pipe assembly it changes
the burner’s gas pressure drop so that the propane
pressure drop is equal to the natural gas pressure drop
of the same BTU fi ring rate. That is why the Manifold