Lennox XC17 Series Unit Information page 33

S Sensor detects an out−of−range outdoor ambient air
temperature condition and will display LED alert code
on the air conditioner control.
S The sensor is operating normally when the ambient air
temperature at the sensor is below or above the air
conditioner control (A175)'s expected ohm values.
The Air conditioner control (A175) will indicate the
sensor as faulty, however under this scenario, the
sensor is not actually faulty.
S Once the outdoor ambient air temperature has returned
to within the sensor's normal operating range, the LED
alert code will automatically stop.
TEST PINS FUNCTION
Placing the JUMPER ON the field test pins (E33) (see page 24 for location of TEST pins) allows the technician to
S Clear compressor anti−short cycle delay.
S Clear five−strike fault lockouts
Place a JUMPER ON
2
second
OFF position.
Clears any short cycle lockout and five strike fault lockout
function, if applicable. No other functions will be executed
and unit will continue in the mode it was operating.
NOTES:
1 Placing a JUMPER ON the TEST pins will not bring the unit out of inactive mode. The only way manually
activate the outdoor unit from an inactive mode is to cycle the 24VAC power to the outdoor unit's air conditioner
control (A175).
2 If the jumper remains on the TEST pins for longer than five seconds, the air conditioner control (A175) will
ignore the JUMPER ON TEST pins and revert to normal operation.
Figure 19. Clearing Anti−Short Cycle Delay and Five−Strike Fault Lockouts
High/low pressure switches and high discharge temperature sensor.
Y1 Active
1
the TEST pins for longer than one
. Then remove jumper and place in JUMPER
Table 6. Sensor Temperature / Resistance Range
Sensor
RT13 Outdoor
(Ambient)
RT28 High
Discharge Line
Temperature
Sensor
Note: Sensor resistance decreases as sensed temperature increases
(see figures 7 and 8).
FACTORY DEFAULT
JUMPER SETTING
Page 33
Resistance
Temperature values range
Range °F (°C) (ohms)
−40ºF to 140ºF 280,000 to 3750
(−40ºC to 60ºC)
−35ºF to 310ºF 41,000 to 103
(−37ºC to 154ºC)
JUMPER
JUMPER
OFF
ON
Pins/Wire
Color
3 and 4
(Black)
1 and 2
(Yellow)
XC17