Introduction
1-10
750-204
Profire D/LND
FIGURE 1-9. Compressor Module and Burner Oil Flow
1.9 — Gas System
Gas is introduced into the combustion zone from a circular manifold through multiple ports in the manifold. Fir-
ing 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.
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