Lennox XP17-024-230-01 Installation And Service Procedure page 9

Table 2. Heat Pump Control (A175) Jumper and Terminal Descriptions
Board ID Label
E12 PSC Fan
E16 PSC Fan
W
L
Y2
Y1
O
DS
E18
C
i-
i+
R
E19 and E20 O OUT
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. P4 provides connections for the temperature sensors.
DIS
(YELLOW)
E30
AMB (BLACK)
COIL
(BROWN)
E33 Field Test
Comp Shift
E37
Delay
50*
70
E47
90
100
W1 Short DS To R Cut for Humiditrol — Enhanced Dehumidification Accessory (EDA) applications.
* Factory default setting
XP17
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 or later)
Input/Output - RSBus data low. Used in communicating mode only with compatible indoor thermostat. (Build -02
or later)
Input/Output - RSBus data high. Used in communicating mode only with compatible indoor thermostat. (Build
-02 or later)
24VAC system power input (Build -02 or later)
24 VAC output connection for reversing valve.
Connection for low-pressure switch (2.4 milliamps @ 18VAC)
24 VAC 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.
Not Used
AMB 1 — Outdoor ambient temperature sensor supply.
AMB 2 — Outdoor ambient temperature return.
Range is -40ºF to +140ºF
COIL 1 — Outdoor coil temperature sensor supply.
COIL 2 — Outdoor coil temperature sensor return
This jumper allows service personnel to defeat the timed off control, initiate or terminate a defrost and field
programming of unit capacity feature.
The heat pump control has a field-selectable function to reduce occasional sounds that may occur while the unit
is cycling in and out of the defrost mode. When a jumper is installed on the DELAY pins (E37), the compressor
will be cycled off for 30 seconds going in and out of the defrost mode. Units are shipped with jumper installed on
DELAY pins. If no jumper is installed, the 30 second compressor shift delay is not active.
Seven position square pin header. E47 provides selection of the defrost terminate temperature based on the posi­
tion of the selection jumper. The defrost termination temperature is measured by the defrost coil sensor. The
jumper termination pin is factory set at 50°F (10°C). If the temperature jumper is not installed, the default termina­
tion temperature is 90°F (32°C). In addition, it provides selection points for enabling the field test mode.
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