Bradford-White Corp PDV100T360, D80T725 Correct improper venting condition Manifold Pressure Port

SERVICE PROCEDURE PDV24-IV

Main Burner 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:

Main burner short cycles.

Control Display may show error

code “63, 57, or 4” and be in

“Soft Lockout” state.

Check gas (line) pressure to the

water heater.

Minimum line pressure should be

5.5" W.C.

Is gas pressure within proper

specification? (see photo at right)

Y

Check venting conditions. (blocked intake or exhaust terminal, excessive vent length, or number of elbows)

Verify pressure switch is not cycling (see “Pressure Switch Testing”.

Is vent system okay?

Y

Is there sufficient combustion air

being supplied to the water

heater?

Y

Line gas

pressure port

N	Determine cause of
	incorrect gas
	pressure and correct.

NCorrect improper venting condition.

Manifold

Pressure Port

Connect hose barb to manifold

pressure port, then connect

monometer to measure gas manifold

pressure.

PDV(S&T) MODELS: Check intake piping and terminal.

N

INDUCED DRAFT MODELS: Make sure there is sufficient air supply to utility room.

Check for unstable pilot flame or oxidized

flame rod on pilot causing weak pilot signal. Make sure pilot shield is in place and does not touch pilot flame sensor. (see “pilot inspection”)

Check burner tubes for scale or debris build-up. Clean burner(s) as necessary.

(see “main burner inspection”)

Check tank flues for blockage or

debris build-up causing

restriction.

(see “flue baffle inspection”)

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