Bradford White EF Series Service Manual page 19

Observe burner operation through the sight glass located on the combustion insert mounting flange.
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
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.
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.
Occasional yellow or white streaks are normal.
Continued from
Continued from
page 18
Refer to ignition module illustration below,
Refer to ignition module illustration below,
is there 24VAC between P3(2) and P3(5) (blue and
is there 24VAC between P3(2) and P3(5) (blue and
brown wires) during the flame establishing period?
brown wires) during the flame establishing period?
(Note: Valve LED must be lit during this check)
(Note: Valve LED must be lit during this check)
Y
Y
Can you hear or feel
Can you hear or feel
gas valve energize?
gas valve energize?
Y
Y
Turn VENTURI set screw
Turn VENTURI set screw
clockwise until its bottomed out.
clockwise until its bottomed out.
Turn screw counter-clockwise
Turn screw counter-clockwise
6-½ turns from bottom.
6-½ turns from bottom.
(see illustration 16)
(see illustration 16)
Does burner light
Does burner light
smoothly, without
smoothly, without
evidence of coughing
evidence of coughing
or huffing?
or huffing?
Y
Y
Does flame LED on the module
Does flame LED on the module
light and stay lit?
light and stay lit?
N
N
Check flame sensor,
Check flame sensor,
Is there 1 to 5 micro amps
Is there 1 to 5 micro amps
during 1.5 second flame
during 1.5 second flame
proving period?
proving period?
(see pg 32)
(see pg 32)
Replace flame sensor
(see page 33)
SERVICE PROCEDURE EF-II
SERVICE PROCEDURE EF-II
Combustion System Testing and Replacement
Combustion System Testing and Replacement
page 18
N
N
Replace Rectifier
Replace Rectifier
harness and/or
N
harness and/or
N
gas valve.
gas valve.
(see pg 24)
(see pg 24)
Check for obstruction
Check for obstruction
at inlet of gas valve.
N
at inlet of gas valve.
N
Is inlet free of
Is inlet free of
obstruction?
obstruction?
Call for technical
Call for technical
support
support
Does burner operate
Y
Does burner operate
normaly until thermostat is
Y
normaly until thermostat is
satisfied?
satisfied?
System OK
System OK
120 volt potential exposure. Isolate the
120 volt potential exposure. Isolate the
appliance and reconfirm power is
appliance and reconfirm power is
disconnected using a multi-meter.
disconnected using a multi-meter.
Replace
Replace
ignition module.
ignition module.
(see pg 34)
(see pg 34)
N
Clear obstruction
N
Clear obstruction
Y
Y
N
N
Y
Y
WARNING
WARNING
IGNITION MODULE
IGNITION MODULE
Venturi
Venturi
adjustment
adjustment
Inlet gas
Inlet gas
pressure tap
pressure tap
16
16
Page 19
Page 19
Page 19