Analog temperature board tests – Maytag Atlantis User Manual
Page 75
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When this occurs, the АТС will shut the cold wa
ter valve off for a brief period of time and turn it
back on to maintain a proper temperature flow.
Rinse fills are not temperature controlled unless
Warm Rinse is selected. During activation, the
indicator light is only ON when the board is con
trolling water temperatures.
The following chart (Figure 8-3) depicts the
philosophy on how the Automatic Tempera
ture Control Board operates. Note, the Ther
mistor Temp represents the temperature
sensed by the thermistor in the water valve.
The outputs are indicative of the board send
ing voltage to the water valve solenoids.
You will note in the following table, the only
combinations where the temperature control
board is active (BOLD) are Warm and Cold
with the temperature control selector in the
ON position. When Cold is selected and the
temperature sensed by the thermistor is too
low at the valve, the Hot valve will be activated.
When Warm is selected and the temperature
sensed by the thermistor is too cool, the Cold
valve will be shut off.
Analog Automatic Temperature Control (АТС) Truth table:
Water Temp
Selections
АТС
Selector
Thermistor
Temp
Hot Valve
Output
Cold Valve
Output
Indicator
Light
Hot
Off
Low
On
Off
Off
Warm
Off
Low
On
On
Off
Cold
Off
Low
Off
On
Off
Hot
Off
High
On
Off
Off
Warm
Off
High
On
On
Off
Cold
Off
High
Off
On
Off
Hot
On
Low
On
Off
Off
Warm
On
Low
On
Off
On
Cold
On
Low
On
On
On
Hot
On
High
On
Off
Off
Warm
On
High
On
On
On
Cold
On
High
Off
On
On
Figure 8-3
Analog Temperature Board Tests
In order to test the board for proper function,
we need to monitor incoming and outgoing
signals to and from the temperature control
board. The chart shown on the next page pro
vides a listing of the eleven terminal pin con
nections (Figure 8-4) of the board, their source
or function, and identifies outputs/inputs
(Figure 8-5).
GY PK PU
GY BR
BK
YL OR
BU
PLUG
WH
47
4
3
47
51
12
35
13
11
7N
11 10 9 8 7 6 5 4 3 2 1
WIRE INSERTION SIDE
SL282TIF
Figure 8-4
16009485-01
©1999 Maytag Appliances Sales Company
Section 8. Electrical Components & Testing
8-5