American Standard 4A6H6018H1000A Service Facts page 8

D D E E F F R R O O S S T T C C O O N N T T R R O O L L
Table 1. Defrost Control Thermistor Table
TEMP °F TEMP °C
-15.00 -26.11
-10.00 -23.33
-5.00 -20.56
0.00 -17.78
5.00 -15.00
10.00 -12.22
15.00 -9.44
20.00 -6.67
25.00 -3.89
30.00 -1.11
35.00 1.67
40.00 4.44
45.00 7.22
50.00 10.00
55.00 12.78
60.00 15.56
65.00 18.33
70.00 21.11
Table 2. DEMAND DEFROST QUICK SPECS
MNEMONIC NO
CNT
GROUP NOMENCLATURE (a)
SUPERSEDURE
CNT
OD FAN TYPE – PSC/ECM
DEFROST ENABLED: Y = ON
COIL TEMPERATURE =
DEFROST PERMIT: Y = ON
COIL TEMPERATURE =
MIN DEFROST TIME (MINUTES)
TARGET DEFROST TIME (MINUTES)
MAX TIME OVERRIDE (MINUTES)
DEFROST TERMINATE COIL TEMPERATURE (Factory Setting)
DEFROST HI TERMINATE COIL TEMPERATURE (Cut Jumper 2)
SOV SWITCH-OVER DELAY
AFTER DEFROST TERM. (SECONDS)
DEFEAT SWITCH-OVER DELAY (SECONDS) (Cut Jumper 2)
LOW AMBIENT HEAT PUMP LOCK OUT
LOW AMBIENT HEAT PUMP RESUME
LPCO INPUT TO CONTROL
LPCO BYPASS IN/OUT DEFROST (MINUTES)
(a) GROUP suffix for drawing number D158283
(b) ≤ (EQUAL OR LESS THAN)
8
THERMISTOR
RESISTANCE
Volts DC
(OHMS)
135976 2.50
115112 2.40
97745 2.29
83247 2.17
71108 2.05
60916 1.93
52333 1.81
45076 1.69
38927 1.56
33703 1.45
29253 1.33
25452 1.22
22198 1.12
19405 1.02
17002 0.93
14930 0.85
13138 0.77
11586 0.70
COMPRESSOR
Table 1. Defrost Control Thermistor Table (continued)
75.00 23.89
80.00 26.67
85.00 29.44
90.00 32.22
95.00 35.00
100.00 37.78
105.00 40.56
110.00 43.33
115.00 46.11
120.00 48.89
125.00 51.67
130.00 54.44
135.00 57.22
Example:
Sensor temp. = 19°F
Measured Resistance = 46K ohms
This sensor is good since the measured value is
relatively close to the chart value.
SCROLL
07255
G01
NA
PSC
1-SPD
≤52 °F (b)
≤32 °F (b)
1
4
15
47°F
70° F
12
0
-7° F
3° F
YES
1
10238 0.63
9065 0.57
8043 0.52
7150 0.47
6368 0.42
5682 0.38
5079 0.35
4548 0.31
4079 0.28
3665 0.26
3298 0.23
2972 0.21
2683 0.19
SCROLL
07256
G02
NA
ECM
1-SPD
≤52 °F (b)
≤32 °F (b)
1
4
15
47°F
70°F
12
0
-7° F
3° F
YES
1
4A6H6018H-SF-1C-EN