Page 11
VARIABLE SPEED CHECKOUT
Using the transformer in the unit, test motor operation by jumping 24 volts
into the terminals illustrated below for the desired speed.
LOW (continuous blower) SPEED
1 2
3 4 5 6
7 8
9 10 11 12 13
J46
R
C
To Y" on ignition control.
!
1. Disconnect power to unit.
2. Disconnect plug J46 from P46 located on the
blower control board.
3. Disconnect C and R from ignition control
board.
4. Disconnect Y" from ignition control and con-
nect a separate wire between R" on the
transformer and Y" on the ignition control.
5. Connect voltage source as shown above.
6. Turn on power to unit. Blower should operate
at LOW speed.
COOLING SPEED
J46
R
C
7− Disconnect power to unit.
8− Connect voltage source as shown above.
9− Disconnect Y" on ignition control and con-
nect a separate wire between R" on trans-
former and Y" on ignition control.
10− Turn on power to unit. Blower should oper-
ate at COOLING speed.
To Y" on ignition control.
HEATING SPEED
11− Disconnect power to unit.
12− Connect voltage source as shown above.
13− Disconnect W" from ignition control and
connect a separate wire between R" on
transformer and W" on the ignition control.
14− Turn on power to unit. Blower should operate
at HEATING speed.
J46
R
C
To W" on on ignition control.
J46
R
C
15− Disconnect power to unit.
16− Connect voltage source as shown above.
17− Disconnect W2" from ignition control and
connect a separate wire between R" on
transformer and W2" on ignition control.
18− Turn on power to unit. Blower should operate
at HIGH HEATING speed.
To W2" on ignition control.
HIGH HEATING SPEED
14 1516
1 2
3 4 5 6
7 8
9 10 11 12 13 14 1516
1 2
3 4 5 6
7 8
9 10 11 12 13 14 1516
14 1516
1 2
3 4 5 6
7 8
9 10 11 12 13
J49 CONTROL CONNECTOR
VOLTAGE
WHEN VOLTAGE IS PRESENT
PIN 1
C1
Common
Low voltage transformer is powered
PIN 2
W / W1
24VAC
W1 (1st stage heating) call from thermostat
PIN 3
C2
Common
Low voltage transformer is powered
PIN 4
Delay
see note
1
Low voltage transformer is powered
PIN 5
Cool
see note
1
Low voltage transformer is powered
PIN 6
Y1
24VAC
Y (cooling) call from thermostat
PIN 7
Adjust
see note
1
Low voltage transformer is powered
PIN 8
Out
Motor sends pulse signals between pin 8 and pin 16 to signal CFM
PIN 9
O
24VAC
From thermostat (in heat pump application)
PIN 10
DS / PWM
0 / 24 VAC
Low voltage is transformer is powered and humidistat operation:
24VAC = normal humidity, 0VAC = high humidity (reduced CFM)
PIN 11
Heat
see note
1
Low voltage transformer powered
PIN 12
R
24VAC
Low voltage transformer is powered
PIN 13
EM / W2
24VAC
W2 (2nd stage heating) call from thermostat
PIN 14
Y / Y2
Not used on single stage cooling
PIN 15
G
24VAC
G is present from thermostat
PIN 16
Out
Motor sends pulse signals between pin 8 and 16 to signal CFM
1
signal from selection taps − A tap = 0 volts, B and C taps = half wave, D tap = 24VAC
