Ignition Spark Response Test
Test to be sure that ignition spark is not actuating the flame
relay (usually 2K) in the flame safeguard control.
1. Close the pilot and main burner manual fuel shutoff
2. Connect the appropriate meter to the flame safeguard
control amplifier. Start the burner and run through the
ignition period. Ignition spark should occur, but the
flame relay must not pull in. The flame signal should not
be more than 0.25 microamp.
3. If the flame relay does pull in, reposition the flame
detector to increase the distance between the flame
detector and the ignition spark. If the flame detector is
not in the line of sight of the ignition spark but appears
to respond to the spark, it may be responding to
reflected spark generated UV radiation. If so, relocate
the flame detector so it does not receive the reflected
UV radiation. It may be necessary to construct a barrier
to block the UV radiation generated by the spark from
the flame detector view.
4. Continue making the adjustments until the flame signal
due to ignition spark is less than 0.25 microamp or
5. The use of the Q624 or Q652 solid-state ignition
transformer may also provide a method to eliminate the
C7027A, C7035A, or C7044A flame detector response
to UV radiation generated by ignition spark. The Q624
and Q652 prevents flame detector response to ignition
spark by providing alternating periods of spark
generation and UV sensor activation. If ignition spark is
detected, try reversing the leads on the Q624 or Q652.
Table 1. Flame Signal.
BC7000 + PM720 3.5
Response to Other Ultraviolet Sources
Some sources of artificial light produce small amounts of
ultraviolet radiation. Under certain conditions, an ultraviolet
detector will respond to them as if it is sensing a flame.
Do not use an artificial light source to check the response
of an ultraviolet detector. To check for proper flame detector
operation, test for flame failure response under all operating
Weld The Sight Pipe (or Tighten
the C7044A Clamp Screw)
When the flame signal is acceptable after all adjustments are
made, remove the flame detector and weld the sight pipe in its
final position. If you are using a swivel mount, the pipe may
already be welded. Then reinstall the flame detector.
NOTE: If using a C7044A Detector with no sight pipe,
do not remove the detector; tighten the clamp
Before putting the burner into service, check out the
installation using the procedures in the Checkout section of
the Instructions for the appropriate flame safeguard control.
After completing the checkout, run the burner through at least
one complete cycle to verify correct operation.