Allen wrench.
Keep the fitting with the boiler for future use.
11. Turn on the gas supply shut off valve and test for gas leaks.
6.3.6 Resetting the gas high / low pressure switches
The gas high and low pressure switches are used to verify that the gas pressure is within the
operating range (see images below). The gas low pressure switch responds to a drop in gas supply,
and will shut down the boiler at 3½" wc (factory set). Located at the back of the gas valve, the gas
high pressure switch is set to shut down the boiler at 15" wc.
After the gas to the boiler is connected and turned on, you must reset the gas low pressure switch.
High pressure switch
Low pressure switch
Figure 49
Gas low/high pressure switches -
EX 400 and EX 500
Figure 50
Gas low/high pressure switches - EX 700
and EX 850
If the gas high or low pressure switch trips, the boiler controller will show a Red bar at the bottom of
the controller screen. The white mark on the dial indicates when the gas pressure switch is set to
trip.
To "reset" either the gas low or high pressure switch, press on the clear plastic cover above the Red
button.
Warning
Do not attempt to adjust the gas high or low pressure switch in the field.
77
6.3.6 Resetting the gas high / low pressure switches
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...
