CleaverBrooks FLX Operation, Service And Parts Manual page 37

Profire V Burner
Figure 2-20: Assembly Drawing 3
Figure 2-21: Assembly Drawing 4
750-177
Figure 2-22: Assembly Drawing 5
PILOT TURN DOWN TEST
For burners equipped with a gas pilot, conduct the following
test:
1. Turn the burner switch on. This will start the blower
motor and initiate the pre-purge sequence. Make sure a
pressure gauge 0"-10" W.C. or manometer is installed in
the pilot line to monitor the pilot gas pressure.
2. When the pilot comes on, put the programmer timer on
pilot hold by placing the Run-Test switch of the flame
safeguard to the "Test" position.
Refer to the flame safeguard control manual instructions.
3. Check the flame signal strength. Adjust the flame signal
by increasing or decreasing pilot gas pressure with the
regulator spring. Normal setting is 4" to 6" W.C.
4. Perform a pilot turndown test by reducing the pilot pres-
sure very slowly until the scanner loses sight of the
flame and give a flame lockout, then reset to normal
level. Note the minimum pressure level.
5. After adjusting the pressure back to normal level, set the
programmer to the "Run" position. Main flame will
come on and the burner is in the low-fire position.
6. Start and stop the burner several times to ensure proper
pilot setting.
7.
Chapter 2
2-25