Page 15
FIGURE 15
TYPICAL BURNER/ELECTRODE ORIENTATION
view looking at flame end of burners
BURNER
FLAME RETENTION RING
UPPER BURNER
MOUNTING RAIL
LOWER BURNER
MOUNTING RAIL
MANIFOLD
ORIFICE
Right
Left
Top
Bottom
FLAME SENSOR
(SOME UNITS MAY HAVE
SENSOR LOCATED IN
MIDDLE OF BURNER)
SPARK ELECTRODE
GROUND
1/8(+1/64)
FIGURE 16
SPARK ELECTRODE TO BURNER GAP
BURNER
FLAME
SENSOR
SIDE VIEW
END VIEW
1/4 in. 7 mm
p 1/32 in. 0.79
mm
3/16 in.
4.7 mm
11/16 in. 18 mm
p 1/32 in. 0.79
mm
H--Gas Valve
The G24M uses a gas valve manufactured by Honey-
well (figure 17) or White Rodgers (figure 18). The valve
is internally redundant to assure safety shut--off. If the
gas valve must be replaced, the same type valve must
be used.
24VAC terminals and gas control knob are located on top
of the valve. All terminals on the gas valve are connected
to wires from the electronic ignition control. 24V applied
to the terminals energizes the valve.
Inlet and outlet pressure taps are located on the valve. A
regulator adjustment screw is located on the valve. Refer
to figure 17 or 18 for location of valve features.
An LPG changeover kit is available from Lennox. The kit
includes burner orifices and a regulator conversion kit.
I--Combustion Air Blower Prove
(Pressure) Switch (S64)
G24M series units are equipped with a combustion air
prove switch located on the vestibule panel. The switch
is connected to the combustion air blower housing by
means of a flexible silicone hose. It monitors air pres-
sure in the combustion air blower housing.
FIGURE 17
TYPICAL ACCESS TO REGULATOR
FOR ADJUSTMENT AND L.P. CHANGEOVER
21
2))
(Honeywell VR8205 series gas valve shown)
*$6 9$/9( 6+2:1 ,1 2)) 326,7,21
,1/(7
35(6685(
7$3
&$3 6&5(:
%ODFN
$'-867,1* 6&5(:
:KLWH
635,1*
7DSHUHG (QG
'RZQ
5HG
*$6 ,1/(7
35(6685(
5(*8/$725
287/(7
35(6685(
7$3
,1/(7
35(6685(
7$3
FIGURE 18
WHITE RODGERS
36E GAS VALVE
GAS VALVE
KNOB SHOWN
IN OFF POSITION
REGULATOR
COVER SCREW
35(6685(
7$3
35(6685(
7$3
GAS INLET