Weil-McLain FLAME GUARDIAN WMBC-1A - Manual (Page 4)

Part Number 550-141-807/0298 4
LGB (Series 2) — Control Supplement
16 13 15
17 18
18
14
12
11 10 9
7
6
5
4
3
2
1
Boiler Jacket
V
ent to Outside Atmosphere
Drip L
eg
Service V
alve
9 Second motorized gas valve w/ on/off actuator
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
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
18 Pipe flanges
17 Adapter, for N. O. vent valve
GAS PIPING DIAGRAM - LGB (Series 2)
IRI Gas Train
8
I
Installation
– continued
Figure 4
IRI gas train schematic