Lennox G32V Series Service Literature page 19

VSP3−1 BLOWER CONTROL BOARD (A24)
1
J46
DELAY COOL
1 1
2 2
3 3
4 4
HTG.
HEAT
BLOWER
DS2
1 2
J73
1
PIN 1 - C - 24 VAC common.
PIN 2 - G - Input signal from thermostat's fan signal.
PIN 3 - W2 - Input signal for second stage heat from the thermostat.
PIN 4 - DS - Input signal for the blower speed regulation.
PIN 5 - Limit - Input signal from the external limit.
PIN 6 - R - 24 VAC power to the thermostat.
PIN 7 - C - 24 VAC common.
Pin 8 - C - 24 VAC common.
PIN 9 - CI - Input signal from the fan limit control.
PIN 10 - CO - Output signal to the burner control.
PIN 11 - HT - Input signal from the fan limit control.
PIN 12 - ACC - 24 VAC accessory output.
PIN 13 - 24V - Input 24 VAC power for the VSP2-1.
PIN 14 - 24V - Input 24 VAC power for the VSP2-1.
PIN 15 - V - Input signal from the gas line.
PIN 1 - Not Used.
PIN 2 - C - 24 VAC common.
PIN 3 - C - 24 VAC common.
PIN 4 - Delay Tap - Delay profile programming input.
PIN 5 - Cool Tap - Cooling blower programming input.
PIN 6 - On / Off - On / off output signal to the ICM2 motor.
PIN 7 - Adjust Tap - ICM2 mode selection.
PIN 8 - NOT USED
PIN 9 - Hi / Low - Speed regulate input signal to the ICM2 motor with CCB1 and
HARMONY only
PIN 10 - Ref. V - ICM2 reference voltage.
PIN 11 - Heat Tap - Heating blower speed programming.
PIN 12 - C - 24 VAC common.
PIN 13 - cfm - Motor speed diagnostic signal.
VOLTAGES INTO VSP3−1
Voltage across J73 pins 13 to 1 and 6 to 1 is 24VAC as shown here.
Refer to unit wiring diagram.
34 volts
0
volts
−34 volts
Voltage across J73 pins 4 to 1 is approximately 15-20VDC (straight voltage)
if CCB is used. If Harmony is used a voltage of 0−25VDC should be present.
If CCB or Harmony is not used, pin 4 to 1 voltage is 21VAC.
VOLTAGES FROM VSP3−1 TO ELECTRONICALLY
CONTROLLED BLOWER MOTOR
Voltage across J46 pins 6 to 3 and 1 to 3 is half-rectified AC as shown here.
Refer to unit wiring diagram.
Approx.
34 volts
0
volts
Voltage across J46 pin 9 to 3 is approximately 15-20VDC if CCB is used. If CCB or
Harmony is not used, pin 9 to 3 voltage is approximately 21VAC. If Harmony is used
a voltage of 0−25VDC should be present.
FIGURE 15
ADJUST HEAT
TEST 1
− 2
+ 3
NORM 4
DS3 HI/LOW DS4
ON/OFF DS1 CFM
210
150
J73
J46
24VAC @ 60Hz.
24VAC Half-Rectified (DC
Pulse)
@ 60Hz.
Diagnostic LED Lights
ON/OFF−DS3 indicates there is a demand for the blower
motor to run. When the ON/OFF LED−DS3 is lit, a demand
is being sent to the motor. In heating mode only, there is a
45−second fan ON" delay in energizing ON/OFF LED−DS3.
Light will not go off until adjustable fan OFF" delay has ex-
pired.
If ON/OFF LED−DS3 is on and both HIGH/LOW LED−DS1
& HEAT LED−DS2 are off, the motor will operate in low
speed (heating).
If HEAT LED−DS2 is on, the blower is running in second−
stage heat speed according to the HEAT" jumper setting.
In heating mode only, there is a 45 second delay in energiz-
ing HEAT LED−DS2. Light will not go off until adjustable fan
OFF" delay has expired.
HIGH/LOW LED−DS1 indicates the blower is operating in
the cooling mode.
CFM LED−DS4 indicates the CFM the blower is providing,
according to the jumper settings.
Before changing jumper setting, make sure the
motor has completely stopped. Any jumper set-
ting change will not take place while the motor
is running.
To change jumper positions, gently pull the jumper off the pins
and place it on the desired set of pins. The following section
outlines the different jumper selections available and condi-
tions associated with each one. Refer to figure 14 for identifica-
tion.
After the CFM for each application has been determined, the
jumper settings must be adjusted to reflect those given in
the tables on page 3 and 4. Using the tables, determine which
row of CFM volumes most closely matches the desired
CFM. Once a specific row has been chosen (NORMAL or
−), CFM volumes from other rows cannot be used. Below
are the descriptions of each of the jumper selections. Re-
fer to table 13 for factory settings. Refer to CFM tables for
approximate air volume for each setting.
Page 19
DS3 ON/OFF
DS2 HEAT
DS1 HI/LOW
DS4 CFM
Jumper Settings
IMPORTANT