Lennox XC21 Series Unit Information page 43

DEMAND
BEGINS
MISMATCHED
RPM
CRC
FAILURE
ONE STAGE
(LOW)
NO
DEMAND
ENDED
YES
TWO STAGE
(HIGH)
NO
DEMAND
ENDED
YES
EDA
OPERATION
NO
DEMAND
ENDED
Figure 21. Fan Motor Control One/Two Stage and EDA LED Sequence of Operation
DEFAULT
FAN MOTOR
SPEED USED
DEFAULT FAN
MOTOR
SPEED USED
FAN MOTOR
ECM1/Y1 RPM SET PER
ONLY JUMPER
SETTINGS
FAN MOTOR
ECM1/Y1
RPM SET PER
ONLY AND
JUMPER
EMC2/Y2
SETTINGS
FAN MOTOR
ECM2/Y2 RPM SET PER
ONLY JUMPER
SETTINGS
YES
Page 43
LED CONTINUOUS FAST
FLASH
LED CONSTANT ON
LED STAGE INDICATOR:
ONE SLOW FLASH AND
ONE SHORT PAUSE
LED STAGE INDICATOR:
TWO SLOW FLASHES
AND ONE SHORT PAUSE
LATER
REPLACE FAN MOTOR
CONTROL BOARD
REPLACE FAN MOTOR
CONTROL BOARD
LED RPM INDICATOR:
EXAMPLE: (2−TON) – 5
SLOW FLASHES AND
LONG PAUSE
LED RPM INDICATOR:
EXAMPLE: (2−TON) – 5
SLOW FLASHES AND
LONG PAUSE
LED STAGE INDICATOR:
THREE SLOW FLASHES
AND ONE SHORT PAUSE
LED RPM INDICATOR:
EXAMPLE: (2−TON – 3
SLOW FLASHES AND
LONG PAUSE
XC21−XXX−230−05 AND
XC21