RS1300003 Rev. 0
26
December 1997
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
°F (°C)
Resistance
Ohms
Temp
°F (°C)
Resistance
Ohms
-20 (-29) 495600
36 (2)
87510
-15 (-26) 418200
38 (3)
82740
-9 (-23) 354000
39 (4)
78300
-6 (-21) 300600
43 (6)
74100
-4 (-18) 256200
45 (7)
70170
5 (-15) 218850
46 (8)
66450
10 (-12)
187470
48 (9)
62970
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.
Factory Set Freezer and Refrigerator Settings
Part #10614401
Factory Set Freezer and Refrigerator Settings
Part #10614402
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
Heater
Watts
Volts (DC)
2.00 Minimum
20.5 Minimum
2.74 Nominal
24.0 Nominal
3.60 Maximum
27.5 Maximum
Frozen Food
Fresh Food
Cut-Out
°F
±
1.5°
Cut-In
°F
±
1.5°
Cut-Out
°F
±
1.5°
Cut-In
°F
±
1.5°
Level
-8
4
39
44
9
-6
6
41
46
8
-4
8
43
48
7
-3
9
44
49
6
-2
10
45
50
5
-1
11
46
51
4
0
12
47
56
3
2
14
49
54
2
4
16
51
56
1
-8
4
—
—
Fast
Freeze
—
—
39
44
Max
Cool
Frozen Food
Fresh Food
Cut-Out
°F
±
1.5°
Cut-In
°F
±
1.5°
Cut-Out
°F
±
1.5°
Cut-In
°F
±
1.5°
Level
-10
2
29
34
9
-8
4
31
36
8
-6
6
33
38
7
-5
7
34
39
6
-4
8
35
40
5
-3
9
36
41
4
-2
10
37
42
3
0
12
39
44
2
2
14
41
46
1
-10
2
—
—
Fast
Freeze
—
—
39
44
Max
Cool
