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7.2 Replacing the fan, gas valve, and burner in EX 400
and EX 500 models
This section documents the following maintenance procedures for EX 400 and EX 500 models:
Replacing the fan
Replacing the gas valve
Replacing the burner.
Fan
Shutoff valve
Manifold gas pressure test port
Inlet gas pressure test port
High pressure switch
Low pressure switch
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7.2 Replacing the fan, gas valve, and burner in EX 400 and EX 500 models
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...