Lennox XC17 Series Unit Information page 26

Board ID Label
E12 PSC Fan
E16 PSC Fan
W
L
Y2
Y1
O
DS
E18
C
i−
i+
R
E21 and E22 LO−PS
E31 and E32 Y1 OUT
E24 and E25 HS−PS
E26 FAN 1
E27 FAN 2
E28 FAN C
Six position square pin header E30 provides connections for the temperature sensors.
DIS (YELLOW)
Pins 5 and 6
E30
AMB (BLACK)
Pins 3 and 4
COIL (BROWN)
Pins 5 and 6
E33 Field Test
W1 Short DS To R
* Factory default setting
XC17
Table 3. Air Conditioner Control (A175) Jumpers and Terminals
Description
240 VAC output connection for outdoor fan.
240 VAC input connection for outdoor fan.
24VAC output for defrost auxiliary heat output.
Thermostat service light connection.
24VAC thermostat input/output for second stage operation of the unit.
24VAC thermostat input for first stage operation of the unit.
24VAC thermostat input for reversing valve operation
Humiditrol Input
24VAC system common (− Build −02 and later)
Input/Output − RSBus data low. Used in communicating mode only with compatible indoor thermostat. (− Build
−02 and later)
Input/Output − RSBus data high. Used in communicating mode only with compatible indoor thermostat. (−
Build −02 and later)
24VAC system power input
S4 connection for low−pressure switch (2.4 milliamps @ 18VAC)
24VAC common output, switched for enabling compressor contactor.
S87 connection for high−pressure switch (E25) and 24VAC (E24) to A177 R" input.
First Stage and second stage basic and precision dehumidification ECM fan motor 24VDC output connection
1.
Second stage basic and precision dehumidification ECM fan motor 24VDC output connection 2.
ECM common connection for ECM fan.
DIS 5 Discharge line temperature sensor supply.
DIS 6 Discharge line temperature sensor return.
Range is −35ºF to 310ºF. Sensor is clipped on a 1/2" copper tube.
AMB 3 Outdoor ambient temperature sensor supply.
AMB 4 Outdoor ambient temperature return.
Range is −40ºF to +140ºF
Not used
This jumper allows service personnel to defeat the timed off control, and field programming of unit capacity
feature. Placing a jumper across both pins on E33 will terminate the anti−short delay. It will also clear lockout
alarms
Cut for Humiditrol (EDA) application. Use only in two−stage units.
Page 26