Lennox G32 SERIES, Информация об устройстве

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Page 9
TABLE 3
SureLight BOARD J156 TERMINAL
DESIGNATIONS
PIN # FUNCTION
1 Ignitor
2 Not Used
3 Ignitor Neutral
4 Combustion Air Blower Line Voltage
5 Not Used
6 Combustion Air Blower Neutral
TABLE 4
SureLight BOARD J58 TERMINAL
DESIGNATIONS
PIN # FUNCTION
1 Primary Limit In
2 Gas Valve Common
3 Roll Out Switch Out
4 Gas Valve 24V
5 Pressure Switch In
6 Pressure Switch and Primary Limit Out
7 Not Used
8 Roll Out Switch In
9 Ground
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.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
a−Electronic Ignition Figures 11 and 12
On a call for heat the SureLight control monitors the com
bustion air blower pressure switch. The control will not be
gin the heating cycle if the pressure switch is closed (by−
passed). Once the pressure switch is determined to be
open, the combustion air blower is energized. When the
differential in the pressure switch is great enough, the pres
sure switch closes and a 15−second pre−purge begins. If
the pressure switch is not proven within 2−1/2 minutes, the
control goes into Watchguard−Pressure Switch mode for a
5−minute re−set period.
After the 15−second pre−purge period, the SureLight ignitor
warms up for 20 seconds after which the gas valve opens
for a 4−second trial for ignition. G32 units with board 63K89,
24L85 or 56L83: the ignitor stays energized for the first sec
ond of the 4−second trial. G32 units with board 97L48: igni
tor stays energized for the full 4−second trial for ignition. If
ignition is not proved during the 4−second period, the con
trol will try four more times with an inter purge and warm−up
time between trials of 35 seconds. After a total of five trials
for ignition (including the initial trial), the control goes into
Watchguard−Flame Failure mode. After a 60−minute reset
period, the control will begin the ignition sequence again.
The SureLight control board has an added feature that pro
longs the life of the ignitor. After a successful ignition, the
SureLight control utilizes less power to energize the ignitor
on successive calls for heat. The control continues to ramp
down the voltage to the ignitor until it finds the lowest
amount of power that will provide a successful ignition. This
amount of power is used for 255 cycles. On the 256th call
for heat, the control will again ramp down until the lowest
power is determined and the cycle begins again.
b−Fan Time Control
The fan on time of 45 seconds is not adjustable. Fan off
time (time that the blower operates after the heat demand
has been satisfied) can be adjusted by flipping the dip
switches located on the SureLight integrated control. The
unit is shipped with a factory fan off setting of 90 seconds.
Fan off time will affect comfort and is adjustable to satisfy
individual applications. See figure 10.
FIGURE 10
FANOFF TIME ADJUSTMENT
To adjust fan−off timing, flip dip switch to desired setting.
60sec. 90sec. 120sec. 180sec.