Lennox CBX32MV Series

Page 13
CBX32MV units built prior to February 2003
#1 PIN JUMPERED
A−Motor runs at 100% until demand is satisfied.
B− Once demand is met, motor ramps down to off.
OFFOFF
A B
100% CFM
COOLING
DEMAND
#2 PIN JUMPERED
A−Motor runs at 82% for approximately 7−1/2 minutes. If
demand has not been satisfied after 7−1/2 minutes,
B−motor runs at 100% until demand is satisfied.
C− Once demand is met, motor ramps down to off.
OFF
OFF
A
B
C
82%CFM
100% CFM
COOLING DEMAND
7 1/2 MIN
#3 PIN JUMPERED
A−Motor runs at 50% for 1/2 minute. B−Motor then runs at
82% for approximately 7−1/2 minutes. If demand has not
been satisfied after 7−1/2 minutes. C−Motor runs at 100%
until demand is satisfied. D− Once demand is met, motor
ramps down to off.
A
B
OFF
OFF
C D
1/2 MIN
50% CFM
7 1/2 MIN
82% CFM
100% CFM
COOLING DEMAND
#4 PIN JUMPERED
A−Motor runs at 50% for 1/2 minute. B−Motor then runs at
82% for approximately 7−1/2 minutes. If demand has not
been satisfied after 7−1/2 minutes. C−Motor runs at 100%
until demand is satisfied. D− Once demand is met, motor
runs at 50% for 1/2 minute then E− Motor ramps down to off.
A
B
OFF
OFF
C D
E
1/2 MIN
50% CFM
COOLING DEMAND
7 1/2 MIN
82% CFM
100%
CFM
1/2 MIN
50% CFM
CBX32MV units built February 2003 and later
#1 Pins Jumpered
A− Motor runs at 100% until demand is satisfied.
B− Once demand is met, motor ramps down to stop.
OFFOFF
A B
100% CFM
COOLING
DEMAND
#2 Pins Jumpered
A− Motor runs at 100% until demand is satisfied.
B− Once demand is met, motor runs at 100% for 45*
seconds.
C− Motor ramps down to stop.
OFF
OFF
A
B
C
100% CFM
100% CFM
(*45 seconds)
COOLING DEMAND
* CB32XMV units date coded prior to 2−2006 will delay 60 seconds
#3 Pins Jumpered
A− Motor runs at 82% for approximately 7−1/2 minutes. If
demand has not been satisfied after 7−1/2 minutes −
B− Motor runs at 100% until demand is satisfied.
C− Once demand is met, motor ramps down to stop.
OFF
OFF
A
B
C
82%CFM
100% CFM
COOLING DEMAND
7 1/2 MIN
#4 Pins Jumpered
A− Motor runs at 50% for 30 seconds.
B− Motor then runs at 82% for approximately 7−1/2
minutes. If demand has not been satisfied after 7−1/2
minutes,
C− Motor runs at 100% until demand is satisfied.
D− Once demand is met, motor runs at 50% for 30
seconds.
E− Motor ramps down to stop.
A
B
OFF
OFF
C D
E
1/2 MIN
50% CFM
COOLING DEMAND
7 1/2 MIN
82% CFM
100%
CFM
1/2 MIN
50% CFM
III−VARIABLE SPEED MOTOR
TROUBLESHOOTING
DO
• Check motor, controls, wiring and connections
thoroughly before replacing.
• Use proper replacement parts for motor and control
model numbers.
• Keep duct static to a minimum.
• Size equipment properly.
• Check orientation before inserting motor connector.
DON’T
• Automatically assume the motor is bad.
• Locate connectors above 7 and 4 o’clock positions.
• Replace a control or motor number with an
unauthorized replacement.
• Use high pressure drop filters.
• Use restricted returns.
• Oversize systems then compensate with low airflow.
MOISTURE CHECK
• Connectors should point downward.
• Arrange harness with drip loop under motor.
• Check condensate drain plug.
• Check for airflow (too much latent capacity).
• Check for undercharged condition.
• Check for plug leaks in return ducts, cabinet.