Introduction
1-4
750-204
Profire D/LND
metering pump, and/or gas volume butterfly valve are controlled through variable rate rod and lever linkages. The
modulating motor rotates 90º from low to high position. Flow rate through each component is adjusted by posi-
tioning the control rods on the levers and the angular position of levers on shafts. The lever on the modulating
motor shafts actuate the high fire position proving switch.
1.7 — Firing Head
Access to the firing head is provided by swinging open the impeller housing. First, disconnect the damper link-
age, release the housing latch, and swing the housing to the open position. An internal gas pilot is standard on
all burners. Pilot gas pressure is adjusted at the pilot pressure regulator.
FIGURE 1-2. Firing Head Assembly
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