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Illustrated Gas Trains by Capacity and Code: The following illustrations show the Webster configuration for UL,
FM and IRI as grouped by UL capacity ratings. Refer to the legend below for component part identification. These
illustrations are not to be used for field erection and/or system design purposes.
UL Capacity Range
BTU/Hr.
To 2,500,000
NOTE: Pressure Drops: Pressure drop through a given gas train will vary somewhat in relation to the individual
items used, the specific gravity of the gas to be burned and the overall length.
722196
Vent to Outside
VENT TO OUTSIDE ATMOSPHERE
Atmosphere
Manual
Ball Valve
1
Gas
GAS
Supply
SUPPLY
UL-FM On-Off Gas Piping Diagram - Up to 2,500 MBH Firing Rate 1/2 PSI Max
722195
Manual Ball
Valve
1
Gas
GAS
Supply
SUPPLY
Gas Pressure
Regulator
UL-FM Low Fire Start Gas Piping Diagram - Up to 2,500 MBH Firing Rate
SG Manual
E. FUEL SYSTEMS
Operation Mode
On-Off
Low Fire Start
Low Hi Low
Modulating
Main Solenoid
Gas Valve
Gas
Pressure
Regulator
5
6
S
4
Manual
Test Valve
Vent to Outside
Atmosphere
VENT TO OUTSIDE ATMOSPHERE
Main Solenoid
Gas
Gas Valve
5
Pressure
6
Regulator
S
4
Manual
Test Valve
Webster
Designation
UL / GE
GAP
A
X
L
X
H
X
M
X
Main Diaphragm
Gas Valve
Adjustable Bleed Orifice
(35)
VENT
Vent
Manual
3
Ball Valve
35
D
1
4
Manual
Test Valve
Main Motorized
Gas Valve
7
M
4
Manual
Test Valve
Page 9
Code
Illustration
FM
X
722196
X
722195
X
722197
X
722198
Manual
Ball Valve
1
Manual Ball
Valves
Manual Ball
Valve
1
1
1
722196
Gas
Burner
Manifold
GAS BURNER
MANIFOLD
722195
Gas
GAS BURNER
Burner
MANIFOLD
Manifold
Fuel Systems
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