Bradford-White Corp Commerical 24 Volt Flue Damper series Water Heater Illustration, Condition

SERVICE PROCEDURE D24-II

Pilot Operation Testing

DANGER

120 volt exposure. To avoid personal injury, use caution while performing this procedure.

CAUTION

Be Careful When Making Voltage

Measurements or Jumping Terminals

Not to Damage or Deform Connectors or

Connector Pins.

Condition:

Pilot lights, no flame signal.

Module continues to spark until

system “Lock Out”.

Main burner will not light.

Check for loose or damaged flame sense lead from pilot to module. (see illustration 1). Is flame sense lead okay?

Y

Check for loose or damaged

ground wire(s). Are ground wires

okay?

Y

Check venting conditions or

negative pressure

Is vent system okay?

Y

White flame

sense lead from

pilot

NRepair wire lead or replace pilot.

NRepair ground

wire(s) or replace as needed.

NCorrect improper venting condition.

Flame rod

Illustration 1

Meter	Flame rod
Probe

Multi-meter set

to micro-amp

setting (ȝA)

			Determine cause for
Is heater condensing causing		Y	condensing and correct.
pilot interruption?			Under sized heater or high
			demand periods
	N
Disconnect white flame sense			NOTE:
lead from ignition module at the
“SENSE” location. Set multi-			If multi meter is not capable of
meter to the “Micro Amps”			testing micro amps, check
setting (ȝA) (see note). Check			continuity of sense lead. If no
micro amp reading. Be sure			continuity, clean pilot flame rod
module is sparking during this			or replace pilot.
test.			(see illustration 3)
(see illustration 2)

	Micro-amp readings
0.000 Micro Amp =	Replace module.
1.0 micro amp or less =	Clean pilot flame rod or replace pilot.

White wire lead

from pilot

Meter

Probe

Illustration 2

Meter

Probe

Flame rod

Multi-meter set

to check continuity.

Meter

Probe

Illustration 3

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