Typical Burner Assembly; Pilot, Spark Electrode And Flame Sensor - Lennox G23Q2-50 Unit Information

G23/g23x series

Hide thumbs Also See for G23Q2-50:

Installation instructions manual (31 pages)

Table Of Contents

Table of Contents

Units may be equipped with either flush style or extended

(masted) limit (figure14). Masted limits may be installed

with limit facing blower or away from blower. This orienta-

tion cannot be changed. When removing limit from unit, pay

careful attention to its orientation and make sure limit is re-

installed facing same direction.

H-Pilot, Spark Electrode, Flame Sensor

and Burners (-1 Through -4 Models)

Figure 17 shows the arrangement of pilot, flame sensor,

spark electrode and burners. The ignition control uses di-

rect spark to ignite the pilot. The pilot ignites the burners

and the burners cross-light. The flame sensor uses flame

rectification to sense ignition. The ignition control requires

that pilot flame must be sensed before the main gas valve

is allowed to open. Typically, a 2 to 4 second delay occurs

between the pilot ignition and the main valve opening.

Figure 16 shows the gap between tip of the electrodes and

the burner surface. It is important that the gap be main-

tained for consistent ignition of pilot flame.

A flame retention ring in the end of each burner is used to

maintain correct flame length and shape and to keep the

flame from lifting off the burner head. In addition, the burn-

er entrance to each clamshell (Figure 3) is fitted with a

flame baffle or corbel to enhance the combustion process.

ORIFICE

PRIMARY

RETAINER

AIR INLET

G23(X)-1, -2, -3 AND -4 MODELS BURNER PILOT/ELECTRODE

view looking at side of burners

BURNER