Lennox XC21 User Manual

Page 36
506518−01
Outdoor A175 Main
Control LEDs
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS11
Green
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS14 Red
DS11
Green
Solution
Possible
Cause(s)
Condition
icomfort
Toucht
Thermostat
Display
DS14 Red
OFF
SLOW
Flash
Moderate Alert
Code 410
Low Pressure
Fault
1
Restricted air
flow over indoor
or outdoor coil.
2
Improper refrig-
erant charge in
system.
3
Improper meter-
ing device
installed or in-
correct opera-
tion of metering
device.
4
Incorrect or im-
proper sensor
location or con-
nection to sys-
tem.
1
Remove any blockages or restrictions from coils and/or
fans. Check indoor and outdoor fan motor for proper cur-
rent draws.
2
Check system charge using approach and subcooling
temperatures.
3
Check system operating pressures and compare to unit
charging charts.
4
Make sure all pressure switches and sensors have se-
cure connections to system to prevent refrigerant leaks or
errors in pressure and temperature measurements.
OFF ON
Critical Alert
Code 411
Low Pressure
Switch Lockout
SLOW
Flash
OFF
Moderate Alert
Code 412
High Pressure
Fault
ON OFF
Critical Alert
Code 413
High Pressure
Discharge Sensor
Lockout
SLOW
Flash
ON
Moderate Alert
Code 414
Discharge Line
Temperature Fault
This code detects high discharge temperatures. If the discharge line
temperature exceeds a temperature of 279ºF (137ºC) during compressor
operation, the control will de−energize the compressor contactor output (and the
defrost output if active). The compressor will remain off until the discharge
temperature has dropped below 225ºF (107ºC). See figure 21 for further details
concerning lockouts and reset procedures.
FAST
Flash
ON
Critical Alert
Code 415
Discharge Line
Temperature
Lockout
OFF Fast Flash
Moderate /
Critical Alert
Code 417
Discharge Sensor
Fault
The A175 control detects open or short sensor or out of temperature sensor
range. This fault is detected by allowing the unit to run for 90 seconds before
checking sensor resistance. If the sensor resistance is not within range after 90
seconds, the control will raise the alarm.
Fast simultaneous flashing of DS11, DS13,
DS14 and DS15
OEM Mode Factory Test Mode.

Lennox XC21 Specifications

General

SEER Rating	up to 21.00
Sound Rating	as low as 69 dB
Refrigerant	R-410A
Energy Star Certified	Yes
Compressor Type	Two-Stage
Cooling Capacity (BTU/h)	24000-54000
Warranty	10-Year Limited Warranty on compressor