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We have two regulators, NG and LP, where you hock up the inlet as needed. Then the gas goes to a control valve that it can be a standard manual valve, milivolt valve, thermostatic valve or an IPI system. The outlets from this valve go to the selector valve which has two separate inlets, one for the pilot and the other one for the burner outlet.
Selector valve:
Pilot
The gas that comes from the inlet FOR the pilot goes to the LP outlet or the NG outlet depending on the position that we have in the selector valve. These outlets feed separately the pilot having a unique outlet.
Burner outlet
There are two possibilities:
> Two outlets.
These feed two different orifices in the burner (mainly for plaque heaters)
> Unique outlet for the rest.
The NG orifice is going straight to the burner and the LP orifice is built inside the valve.
The stem in the selector valve has a mechanism that allows restricting or opening the primary air in the burner.
Thermal switch
This switch allows you to cut the system off when a wrong connection is made.
TROUBLE SHOOTING
Valve in LP and inlet gas through the NG regulator
Insufficient pressure for the system, it will switch off because we don't have enough pressure and gas in the pilot to sustain the flame. The thermocouple will get cold.
Valve in NG and inlet gas through the LP regulator
The system will have to much flow though the burner and the flames will go outside the firebox. At this moment, because of the location of the thermal switch, the system will shut off.
