Removing The Appliance Control Unit (Acu) - Whirlpool 4.3 CU FT Service Manual

COMPONENT ACCESS

Removing the Appliance Control Unit (ACU)

WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or
electrical shock.
To Remove the Appliance Control Unit (ACU)
1. Unplug dryer or disconnect power.
2. Perform the procedure on page 4-11, "Remove the Console
/User Interface" prior to performing the following steps.
3. Disconnect all connectors from the ACU and remove the
harnesses from the routing clips. See Figure 1.
4. Depress the top right and left tabs to release ACU from
the front bulkhead. See Figure 1.
Left Tab
5. Tilt out and remove ACU taking care not to hit the door
switch paddle.
4-12 Whirlpool Compact Heat Pump Dryer
n
Right Tab
Routing
Clips
Figure 1
connect black probe to ACU J13-2 (L2) and
red probe to J13-1 (L1). (See Figure 2.)
Plug in dryer or reconnect power.
M – Motor Supply WI2 – User Interface
J4-1 L1 Motor J17-1 VPOS
J4-2 L2 Motor J17-2 +5VDC
J17-3 WIDE
FM – Fan
J17-4 GND
J2-1 L1
Appliance Control Unit (ACU)
SEH – Moisture Sensor
J2-3 L2
J11-1 Gnd
DP – Drain Pump
J11-3 Moisture Sensor
J3-1 L1
IF – RFI
J3-3 L2
J13-1 L1
J13-2 L2
WI1 – MCU communication
WI2 – User
interface
DP – Drain
pump
FM – Fan
M – Motor
supply
Figure 2 - ACU Connectors
Figure 2
& Pinouts
ACU Connectors & Pinouts
IF – RFI
J13-1 L1 In
J13-2 L2 In
HE – Compressor
J5-1 L2 Compressor
J5-2 L1 Compressor
FM – Auxiliary Fan
J2-1 L1 Fan
J2-3 L2 Fan
DP – Drain Pump
J3-1 L1 Pump
J3-3 L2 Pump
M – Motor Supply
J4-1 L1 Motor
J4-2 L2 Motor
WI1 – MCU Communication
J12-2 +12 VDC
J12-3 IN/OUT
J12-4 GND
check inside header J17 on ACU, betwee
2 & 4—DO NOT SHORT PINS TOGETHE
HE – Heater (Condenser dryer)/
Compressor (HP dryer)
Condenser dryer HP dryer
J5-1 L2 J5-1
J5-2 Heater 1 J5-2
J5-3 Heater 2
WI1 – MCU Communication
J12-2 +12VDC
J12-3 IN/OUT
HX Filter &
NTC
J12-4 GND
Level Switch N/A
Heater
HX-SLE
SET1 SET2
HE – Heater/
Compressor
IF – RFI
Door Switch Paddle
W12 – User Interface
J17-1 VPOS
J17-2 +5 VDC
J17-3 WIDE
J17-4 GND
SEH – Moisture Sensor
J11-1 GND
J11-3 Moisture Sensor
HX-SLE – Heat Exchanger
Filter and Level Switch
J8-1 HX Filter Sw 1
J8-2 HX Filter Sw 2
J8-3 Water Lvl Sw 1
J8-4 Water Lvl Sw 2
SET2 – NTC Heater
J6-1 NTC Heat 1
J6-3 NTC Heat 2
HX-SLE – Heat
Exchanger Switch
and Level Switch
L2
J8-1 Heat Ex 1
Compressor
J8-2 Heat Ex 2
J8-3 Float 1
J8-4 Float 2
SET1 – NTC Air Ch
J7-1 NTC Air 1
Moisture
J7-3 NTC Air 2
Sensor
SET2 – NTC Heater
SEH
J6-1 NTC Heat 1
J6-3 NTC Heat 2
DO NOT REMOVE OR DES