Bradford White EF100T150(E)*(N Service Manual page 45

Observe burner operation through the sight glass located on the combustion insert mounting flange. Normal burner
operation should ignite smoothly, without evidence of coughing or huffing upon ignition. The burner flame should be a blue
flame near the burner surface in a uniform flame pattern. Occasional yellow or white streaks are normal.
Serial Numbers including and AFTER GB13006174 and ALL EFR models
Note: On higher input models using metal fiber mesh burner a red
glow from the burner surface is normal.
Verify Minimum Gas Supply Piping Requirements of:
Minimum ¾" NPT. (Schedule 40 black Iron Pipe
recommended).
Y
With manometer, check inlet
gas pressure. Is it stable
between 7" & 14" W.C. static?
(heater not running)
(see illustrations at right)
Y
Does inlet gas pressure
drop more than 2" W.C.
during burner ignition?
N
WARNING
120 volt potential
exposure. Use caution
making voltage checks to
avoid personal injury.
Can Sparking be seen/
N
heard at the spark rod
to the burner?
Y
N
Does main burner
Light?
Y
Proceed to next page
N
Inadequately
sized regulator.
N
Is gas supply pressure
N
regulator adjustable to
Y
maintain proper and
stable setting?
Y
Check resistance of high voltage
cable. Resistance should be 0-1 ohms.
If resistance is high, replace spark
cable. If spark cable is good, replace
Remove high voltage wire connected at the
spark rod and hold approximately ¼" from metal
ground with insulated pliers during the ignition
cycle (3 second spark trial period).
Is there spark to ground?
Y
Check continuity of
Y
N
spark rod. Is
reading 0-1 Ohm?
Check spark gap to burner
(see "Spark Rod Gap
Inspection")
Reconfigure gas
supply piping
Adjust gas
supply regulator
WARNING
Removing screw from
inlet gas pressure tap will
immediately allow gas to
flow from pressure tap.
Control Board.
N
Replace Spark Rod
(see "Spark Rod
Volt meter set to
Gap Inspection and
OHM setting
Replacement"
Venturi
adjustment
Inlet gas
pressure tap
Voltmeter set to
OHM setting
Spark Rod
Meter probe
Spark Rod
Meter probe
CHECK SPARK ROD
RESISTANCE
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