Surelight Two Stage Variable Speed Control - Lennox G32V Series Service Literature

Heating Mode
Units With
Single−Stage Heating
Non−Zoned Applications
Using a single−stage thermostat
with "one−stage" heating, the HEAT
LED−DS2 is lit when the thermostat
calls for heat. The ON/OFF LED−
DS3 is lit after 110 seconds (65 sec-
onds prepurge and 45 seconds fan
"ON" time) from the time a call for
heat is made. This indicates the
blower is operating in high speed
heat.
Using a single−stage thermostat
with "W2 TIMED" and W1 calling,
the ON/OFF LED−DS3 is lit to indi-
cate the blower is operating on low
speed heat.
When HEAT LED−DS2 is lit, the
blower is operating in high speed
heat and second−stage (W2) is call-
ing.
Harmony Zoned Applications
The blower speed is controlled by
the PWM (pulse width modulation)
signal sent from the control center
of the zoning system to the terminal
strip's DS terminal. HI/LOW LED−
DS1 and ON/OFF LED−DS3 are lit
to indicate the blower is operating.
Note − In Harmony II zoning applica-
tions, HTG BLOWER jumper must
be in position #2.
NOTE − For zone applications with Harmony, remove the wire from pin #2 and pin #13 of the J49 terminal at the motor and the wire
from pin #3 of the J73 terminal on the VSP control board, insulate the ends and secure to prevent shorting.
8.Two Stage Variable Speed Control (A24)
G32V−5 and later Units
WARNING
Shock hazard.
Disconnect power before servicing. Integrated
Control Board 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.
G32V−5 and later units are equipped with the Lennox two−
stage, variable speed integrated SureLight control board.
The system consists of a ignition / blower control board
(figure 16 with control terminal designations in tables 16
through 19) and ignitor (figure 9). The board and ignitor
work in combination to ensure furnace ignition and ignitor
durability. The SureLight integrated board controls all ma-
jor furnace operations. The board features two LED lights,
DS1 and DS2 for troubleshooting and four LED lights
TABLE 15
G32V−4 Units with VSP3−1
Units With
Two−Stage Heating
Non−Zoned Applications
Using a two−stage thermostat with
first−stage (W1) calling, the ON/
OFF LED−DS3 is lit to indicate the
blower is operating in low speed
heat.
When the ON/OFF LED−DS3 and
HEAT LED−DS2 are lit, the blower is
operating in high speed heat and
second−stage (W2) is calling.
HEAT LED−DS2 is lit with a call for
heat from the thermostat. ON/OFF
LED−DS3 is after 110 seconds from
the time a call for heat is made.
Harmony Zoned Application
The blower speed is controlled by
the PWM (pulse width modulation)
signal sent from the control center
of the zoning system to the terminal
strip's DS terminal. HI/LOW LED−
DS1 and ON/OFF LED−DS3 are lit
to indicate the blower is operating.
Note − In Harmony II zoning applica-
tions, HTG BLOWER jumper must
be in position #2.
Units With
Single−speed Compressor
Non−Zoned Applications
Y1−DS and Y1−Y2 must be jump-
ered together. With a call for cool-
ing, G, Y1, Y2 and DS on the unit
control board are energized from
the thermostat. HI/LOW LED−DS1
and ON/OFF LED−DS3 are lit to in-
dicate a call for cooling.
Note − Y1 to DS and Y1 to Y2 are
factory jumpered for single−stage
cooling, non−zoned applications.
Harmony Zoned Application
The blower speed is controlled by
the PWM (pulse width modulation)
signal sent from the control center
of the zoning system to the terminal
strip's DS terminal. HI/LOW LED−
DS1 and ON/OFF LED−DS3 are lit
to indicate the blower is operating.
(DS3, DS6, DS7 and DS8) to show furnace status. The
board also has two accessory terminals rated at (1) one
amp each. See table 20 for status code and table 21 for
troubleshooting diagnostic codes.
Electronic Ignition
At the beginning of the heat cycle the SureLight control
monitors the combustion air inducer prove switch. The con-
trol will not begin the heating cycle if the prove switch is
closed (by−passed). Once the prove switch is determined to
be open, the combustion air inducer is energized on low
(first stage) heat speed.
G32V−75 Only
At the beginning of the heat cycle the SureLight control
monitors the first and second stage combustion air inducer
prove switches. The control will not begin the heating cycle
if the first stage prove switch is closed (by−passed). Like
wise the control will not begin second stage heat if the sec-
ond stage prove switch is closed and will allow first stage
heat only. However, if the second stage prove switch closes
DURING first stage pre−purge, the control will still respond
to second stage heat.
Page 22
Cooling Mode
Units With
Two−speed Compressor
Non−Zoned Applications
Y1−DS must be jumpered together.
With a call for single−stage cooling,
G, Y1, and DS on the unit control
board are energized from the Ther-
mostat. With a call for second−stage
cooling, G, Y1, Y2, and DS on the
unit control board are energized
from the thermostat. In both cases,
HI/LOW LED−DS1 and ON/OFF
LED−DS3 are lit to indicate a call for
cooling.
Note − Jumper Y1−Y2 must be re-
moved for units with two−speed
compressor.
Harmony Zoned Application
The blower speed is controlled by
the PWM (pulse width modulation)
signal sent from the control center
of the zoning system to the terminal
strip's DS terminal. HI/LOW LED−
DS1 and ON/OFF LED−DS3 are lit
to indicate the blower is operating.