Surelight Ignition System - Lennox G32V Series Service Literature

Integrated ignition and blower control components (A92),
unit transformer (T1) and 24V circuit breaker (CB8) are lo-
cated in the control box. In addition, a door interlock switch
(S51) is located in the control box. Jackplugs allow the con-
trol box to be easily removed for blower service.
1. Control Transformer (T1)
A transformer located in the control box provides power to
the low voltage 24volt section of the unit. Transformers on
all models are rated 50VA with a 120V primary and a 24V
secondary.
2. Circuit Breaker (CB8)
A 24V circuit breaker is also located in the control box. The
switch provides overcurrent protection to the transformer
(T1). The breaker is rated 3A . If the current exceeds this limit
the breaker will trip and all unit operation will shut-down. The
breaker can be manually reset by pressing the button on the
face.
3.Door Interlock Switch (S51)
A door interlock switch is located on the control box. The
switch is wired in series with line voltage. When the blower
door is removed the unit will shut down.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during furnace
installation and service to protect the furnace's
electronic controls. Precautions will help to
avoid control exposure to electrostatic dis-
charge by putting the furnace, the control and
the technician at the same electrostatic poten-
tial. Neutralize electrostatic charge by touching
hand and all tools on an unpainted unit surface,
such as the gas valve or blower deck, before per-
forming any service procedure.
DANGER
Disconnect power before servicing. Control is not
field repairable. If control is inoperable, simply
replace entire control.
Can cause injury or death. Unsafe operation will
result if repair is attempted.
4.SureLight Ignition System A92
G32V−1 through −4 units are equipped with the Lennox
SureLight ignition system. The system consists of ignition
control board (figure 8 with control terminal designations
in table 1) and ignitor (figure 9). The board and ignitor work
in combination to ensure furnace ignition and ignitor dura-
bility. The SureLight integrated board controls all major fur-
nace operations. The board also features two LED lights
for troubleshooting (and two accessory terminals rated at
(4) four amps. See table 8 for troubleshooting diagnostic
codes.
NOTE − Do not remove blower access panel to read
SureLight LED lights. A sight glass is provided on the
access panel for viewing.
Tables 9 and 10 show jack plug terminal designations.
Units equipped with the SureLight board can be used with
either electronic or electro−mechanical thermostats with-
out modification. The SureLight ignitor is made of durable
silicon−nitride. Ignitor longevity is also enhanced by volt-
age ramping by the control board. The board finds the low-
est ignitor temperature which will successfully light the
burner, thus increasing the life of the ignitor.
SURELIGHT CONTROL BOARD
13/32'
5/16
"
Page 11
FIGURE 8
SURELIGHT IGNITOR
MEASUREMENT IS TO I.D.
5/8"
OF RETENTION RING
FIGURE 9