Introduction
1-6
750-297
Profire E/LNE Series Manual
FIGURE 1-3. Compressor Module and Burner
1.7 — Gas System
Gas is introduced into the combustion zone from a circular manifold through multiple ports in the manifold. Firing rate
is determined by the size and number of ports, by manifold pressure, and by combustion zone pressure. The firing rate
is regulated by a rotary, butterfly-type throttling valve at the manifold inlet. The valve is actuated by an adjustable
linkage from the modulating motor. Depending upon specific requirements, one or two safety shutoff motorized main
gas valves are provided for installation in the gas train upstream of the butterfly valve. Safety shutoff gas valves are
wired into the programming control to automatically open and close at the proper time in the operating sequence.
1.7.1 — Main Gas Train Components
Depending upon the requirements of the regulating authority, the gas control system and gas train may consist of some,
or all, of the following items:
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