Temperature Control Operation; Refrigerator And Freezer Thermistor; Factory Freezer And Refrigerator Settings; Damper Control - Amana SXD25S2 Service

Electronic Functional Description

Temperature Control Operation

For any temperature setting, outputs will be turned
off/on based on cut-in/cut-out temperatures
determined by resistance levels of freezer and
refrigerator thermistors.
As the temperature decreases, resistance increases.
As the temperature increases, resistance decreases.

Refrigerator and Freezer Thermistor

Part # C8983701
Temp Resistance Temp
°F (°C) Ohms °F (°C)
-20 (-29) 495600 36 (2)
-15 (-26) 418200 38 (3)
-9 (-23) 354000 39 (4)
-6 (-21) 300600 43 (6)
-4 (-18) 256200 45 (7)
5 (-15) 218850 46 (8)
10 (-12) 187470 48 (9)
16 (-9) 161040 50 (10) 59670
19 (-7) 138690 55 (13) 52290
25 (-4) 119760 61 (16) 45900
30 (-1) 103680 64 (18) 40410
32 (0) 97920 70 (21) 36540
34 (1) 92550 77 (25) 30000
An open thermistor or thermistor circuit will result in
failure of refrigerator to cool.
Shorted thermistor will cause refrigerator to run 100
percent of time except for defrost.
• Freezer temperature setting and thermistor value
will determine if compressor/condenser fan and
evaporator fan switches are open or closed.
Compressor/condenser fan switch must be open
for 6 minutes before switch can close again
(compressor dwell time).
• Cut-out and cut-in temperature values must be
reached and maintained for 15 seconds before
output state will change (digital delay).
• Refrigerator and freezer control calibration can be
adjusted in Program Mode B.
RS1300003 Rev. 0
Resistance
Ohms
87510
82740
78300
74100
70170
66450
62970
26

Factory Set Freezer and Refrigerator Settings

Part #10614401
Frozen Food
Cut-Out Cut-In Cut-Out
°F ±1.5° °F ±1.5° °F ±1.5°
-10 2
-8 4
-6 6
-5 7
-4 8
-3 9
-2 10
0 12
2 14
-10 2
— —
Factory Set Freezer and Refrigerator Settings
Part #10614402
Frozen Food
Cut-Out Cut-In Cut-Out
°F ±1.5° °F ±1.5° °F ±1.5°
-8 4
-6 6
-4 8
-3 9
-2 10
-1 11
0 12
2 14
4 16
-8 4
— —

Damper Control

• Refrigerator temperature setting and thermistor
value will determine if damper control heater
switch is to be open or closed.
• Damper closes at 48°F.
• Damper opens at least 1/4" when minimum voltage
is applied at 40°F ambient.
Damper
Watts
2.00 Minimum
2.74 Nominal
3.60 Maximum
Fresh Food
Level
Cut-In
°F ±1.5°
29 34 9
31 36 8
33 38 7
34 39 6
35 40 5
36 41 4
37 42 3
39 44 2
41 46 1
Fast
— — Freeze
Max
39 44 Cool
Fresh Food
Level
Cut-In
°F ±1.5°
39 44 9
41 46 8
43 48 7
44 49 6
45 50 5
46 51 4
47 56 3
49 54 2
51 56 1
Fast
— — Freeze
Max
39 44 Cool
Heater
Volts (DC)
20.5 Minimum
24.0 Nominal
27.5 Maximum
December 1997