Middleby Marshall PS220, PS570 Pilot/ignitor assembly, Flame targets, D. Pilot/Ignitor Assembly

D. Pilot/Ignitor Assembly

The pilot assembly is attached to the end of the pilot line. It consists of an ignitor electrode/flame sensor, a pilot shield and the pilot burner. See Figure 63.

The pilot assembly includes a safety circuit. An electrical current is sent to the flame sensor probe to prove the pres- ence of the pilot flame. When the spark ignites the pilot, a circuit is completed THROUGH THE FLAME from the flame sensor probe to the pilot burner, which is grounded. This safety circuit must be completed before the pilot will light.

1.Pilot Shield

The pilot shield is a plate located on the bottom of the pilot. It prevents drafts, etc. from blowing the pilot flame away from the sensing probe. See Figure 64.

2.Flame target

The flame target aids in distributing the flame from the end of the venturi. See Figure 65.

•PS310/360-series ovens built prior to 6/87 are not equipped with a flame target. The burner on these ovens resembles the one shownin Figure 64.

•The angled flame target is used on:

-PS200-series ovens built through 3/02.

-PS310, PS314, PS360 and PS360WB ovens built 6/87 or later.

-PS570S ovens.

All of these ovens use a 120V burner blower motor. Most units equipped with the 120V burner blower motor also use the angled flame target.

•The round flame target is used on:

-PS200-series ovens built 4/02 or later.

-PS360EWB and PS360WB70 ovens equipped with the Wayne burner system.

-PS555 and PS570G ovens.

All of these ovens use a 208/240V burner blower motor. All ovens equipped with the line voltage burner blower motor use the round flame target.

SECTION 3 - SERVICING COMPONENTS

Figure 63 - Pilot/ignitor assembly

Pilot line

connects here

Pilot burner

Hood

Ignitor/sensor	Spark cable
probe	connects here

Figure 64

End of burner without flame target

showing pilot shield

Pilot

shield

Figure 65

Flame targets

Angled	Round
target	target

93