Lennox G32V Series Service Literature page 17

NOTE If fan OFF" time is too low, residual heat in heat
exchanger may cause primary limit S10 to trip resulting
in frequent cycling of blower. If this occurs, adjust blower
to longer time setting.
Table 12 outlines the operation of the variable speed motor
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 seconds pre−purge
and 45 seconds fan ON" time) from
the time a call for heat is made. This in-
dicates the blower is operating in heat-
ing speed.
Using a single−stage thermostat with
W2 TIMED," and W1 calling, the ON/
OFF LED−DS3 is lit to indicate the
blower is operating on low speed.
When the HEAT LED−DS2 is lit, the
blower is operating in heating speed,
and second−stage (W2) heating 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 zon-
ing 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 the pin #3 of the J73 terminal on the VSP control board, insulate the
end, and secure it to prevent from shorting.
TABLE 12
VSP2−1 G32V−1 / −3 units OPERATION
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 oper-
ating in low speed.
When the ON/OFF LED−DS3 and
HEAT LED−DS2 are lit, the blower is
operating in heating speed and sec-
ond−stage (W2) heating is calling.
HEAT LED−DS2 is lit with a call for heat
from the thermostat. ON/OFF LED−
DS3 is lit after 110 seconds from the
time a call for heat is made.
HARMONY ZONED
APPLICATIONS
The blower speed is controlled by the
PWM (pulse width modulation) signal
sent from the control center of the zon-
ing 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.
Page 17
in relation to specific modes of operation. Some informa-
tion has been repeated from the previous section to provide
an example. Refer to each diagnostic LED or jumper settings
section for more information.
COOLING MODE
UNITS WITH SINGLE−SPEED
COMPRESSOR
NON−ZONED
APPLICATIONS
The terminals DS and Y must be jump-
ered together. With a call for cooling,
terminals G, Y and DS on the unit con-
trol board are energized from the ther-
mostat. HI/LOW LED−DS1 and ON/
OFF LED−DS3 are lit to indicate the
blower is operating on high speed.
NOTE Y and DS are factory jump-
ered for single−stage cooling, non−
zoned.
NOTE For low speed during single−
stage cooling remove jumper from Y
and Ds.
HARMONY ZONED
APPLICATIONS
The blower speed is controlled by the
PWM (pulse width modulation) signal
sent from the control center of the zon-
ing 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.
UNITS WITH TWO−SPEED
COMPRESSOR
NON−ZONED
APPLICATIONS
The ON/OFF LED−DS3 is lit to indicate
the blower is operating in first stage
cooling. This LED is energized on
when a 24VAC thermostat demand is
supplied to the control (terminal G" on
the control board terminal strip).
In second stage, the ON/OFF LED−
DS3 and HI/LOW LED−DS1 are lit to in-
dicate the blower is operating on high
speed (24VAC is supplied to the unit
terminal strip Y2 from Y2 on the ther-
mostat).
NOTE Jumper must be moved from
Y1 to Y2 In two−speed, non−zoned ap-
plications.
HARMONY ZONED
APPLICATIONS
The blower speed is controlled by the
PWM (pulse width modulation) signal
sent from the control center of the zon-
ing 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.