Viking VUAR140 Troubleshooting Guide download pdf (Page 6)

TROUBLE SHOOTING

GUIDE__---- FREESTANDING GAS RANGE ----

PROBLEM PROBABLE CAUSE CORRECTION

18.Flashback-The air/gas mixture 18A. Under rated burner 18A. Check orifice size. Increase size if

ignites inside the burner to

necessary or increase gas

pressure.

burn near the orifice, creating 18B. Increase primary air. 18B.

Adjust air shutter to reduce

primary

a roaring noise like a blow air.

torch. 18C.

Flashback occurs with the

18C. Change burner valve.

Burner valve in on off

18D. If #1,2 &3 corrections fail to

probably , the valve is eliminate flash back, replace the

probably leaking. burner.

19. Extinction pop-A small 19A. Similar to flashback. 19A. Reduce primary air supplied to

explosion of gas in the the burner. CAUTION: do not

burner head occurs when

allow yellow tipping during

normal

the burner is shut off. burner operation.

19B. Check orifice size.

19C. Check gas pressure.

Check the gas supply and set the regulator to the proper supply of gas. A properly adjusted burner should

be stable and quiet. The flame should have a sharp, well defined blue inner cone, no yellow tipping. The

flame should also be stable and uniform with no flames lifting off the burner ports.

A. VGRC / VGSC I / R broiler construction

prior to Feb. 1995 used one (1) screen

support. The support was mounted

internally from the venturi forward to the

front of the broiler burner box. The screen

support partially covered the glow coil

ignitor. This usually caused slow or delayed

ignition, especially when used LP gas.

B. A change in the manufacturing of the I / R

broiler repositioned the screen supports.

The screen supports, now two (2), are

positioned from, right to left. The glow coil

ignitor is now completely open for igniting

the gas almost immediately.

C. The first generation, VGR / VCM, screen

support should be welded in four (4)

places. A limited production run used

pop rivets. The center of the rivets may

fall out causing the broiler to back flash

to the venturi. Should this occur you can

close the opening with a #6 machine

screw. Any rear or puncture in the screen

or opening in any welded seam will

also cause the broiler to back flash.

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Viking VUAR140 Troubleshooting Guide Page 6

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