Low pressure switch
Low fire adjustment
Mixing device
Figure 42
Gas valve and fan components - EX 400, 500
Fan
Mixing device
Gas high pressure switch
Three- (3) wire Molex plug
Inlet gas pressure test port (location of)
Gas low pressure switch
Low fire adjustment (zero-offset)
High fire adjustment (on the side)
Manifold gas pressure test port
68
Section: Boiler operation
Summary of Contents for EX Series
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Page 121: ...Appendices Wiring diagrams Figure 73 Controller electrical diagram 119 Appendices...
Page 122: ...Figure 74 Internal wiring diagram EX 400 and EX 500 models 120 Section Appendices...
Page 123: ...Figure 75 Internal wiring diagram EX 700 and EX 850 models 121 Wiring diagrams...
Page 124: ...Figure 76 Sequence of Operation 122 Section Appendices...
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Page 128: ...126 Boiler parts diagram EX 400 and EX 500...