Bradford White 20A Service Manual download pdf (Page 31)

SERVICE PROCEDURE D24-III

Main Burner Operation Testing

CAUTION

Be Careful When Making Voltage

Measurements or Jumping Terminals

Not to Damage or Deform Connectors or

Connector Pins.

DANGER

120 volt exposure. To avoid personal injury,

use caution while performing this procedure.

Condition:

Main burner short cycles.

Control Display may show error

ode “63, 57, or 4” and be in

“

Soft Lockout” state.

heck gas inlet pressure to the water

heater gas valve.

Line pressure should be:

Nat. = Min. 5.5" W.C.: Max. 14.0" W.C.

LP = Min. 11.0" W.C.; Max. 14.0" W.C.

Is gas pressure within proper

specification? (see photo below)

Determine cause of incorrect gas

pressure and correct. Contact

your gas supplier.

Check venting conditions, clogged vent,

down drafts or negative building

pressure

Is vent system okay?

Correct improper venting

condition. Refer to

Installation Instructions

Is there sufficient combustion air being

supplied to the water heater? Are there

combustion air openings or supply pipes

to the room? Open access door to the

utility room to see if problem is

corrected.

Provide proper

combustion air to water

heater. Refer to

Installation Instructions

Check burner tubes for scale or debris

build-up. Clean burner as necessary.

(see Main Burner and Pilot Removal and

Inspection)

Check tank flues for blockage or debris

build-up causing restriction.

(see Flue Baffle Removal, Inspection)

Check for unstable pilot flame or

oxidation of the 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 section)

Line gas

pressure port

Manifold Pressure Port with hose

barb inserted for measuring

pressure

Page 31

Check manifold pressure. See photo on lower right section of page for

manifold pressure tap location. Refer to water heater rating label for

specified manifold pressure. If the manifold pressure is not within 0.3"

.c. of the specified pressure, then remove the regulator cap from the

gas valve and turn plastic screw clockwise to increase pressure and

counterclockwise to decrease pressure. Be sure inlet gas pressure is at

least 1" w.c. above the manifold pressure. Replace regulator screw and

pressure tap cap when finished. Is manifold pressure O.K.?

Gas Valve pressure

regulator cap (adjustment

screw accessible by

removing cap screw)

Replace Gas Valve.

Connect hose barb to manifold

pressure port shown above, then

connect monometer to measure

gas manifold pressure.

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Bradford White 20A Service Manual Page 31

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