Weil-McLain FLAME GUARDIAN WMBC-1A Control Supplement page 4

I
Installation
Figure 4
IRI gas train schematic
1
1 Manual main shut-off gas valve
2 Low gas pressure switch
3 Pilot manual shut-off valve
4 Motorized gas valve w/ on/off actuator
5 Pilot gas pressure regulator
6 Normally open solenoid vent valve
7 Pilot solenoid gas valve
8 Test cock
9 Second motorized gas valve w/ on/off actuator
4
LGB
(Series 2) — Control Supplement
– continued
6
2
18 4 17
8
GAS PIPING DIAGRAM - LGB (Series 2)
IRI Gas Train
3 5
7
18 12
9 11 10
13
10 Manual leak checking gas valve
11 Regulating diaphragm gas valve (two stage)
12 High gas pressure switch
13 Main flame sensor
14 Main burner with main flame sensor bracket
15 Pilot burner
16 Main burner with pilot burner bracket
17 Adapter, for N. O. vent valve
18 Pipe flanges
Boiler Jacket
14 15 16
Part Number 550-141-807/0298