Trane 5TWR5 Installation And Operation Manual page 20

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
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.
COMPRESSOR
MNEMONIC NO CNT
GROUP NOMENCLA-
(a)
TURE
SUPERSEDURE CNT
OD FAN TYPE – PSC/
ECM
20
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
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 SCROLL
CNT08177 CNT08176
D161244G01 D161246G02
07824 07825
PSC ECM
1-SPD 1-SPD
Table 2. DEMAND DEFROST QUICK SPECS
DEFROST ENABLED:
Y = ON COIL TEM-
PERATURE
DEFROST PERMIT: Y
= ON COIL TEMPERA-
TURE
MIN DEFROST TIME
(MINUTES)
TARGET DEFROST
TIME (MINUTES)
MAX TIME OVERRIDE
(MINUTES +)
DEFROST TERMI-
NATE COIL TEM-
PERATURE (Factory
Setting)
DEFROST HI TERMI-
NATE COIL TEMPER-
ATURE (Cut Jumper 2)
SOV SWITCH-OVER
DELAY AFTER
DEFROST TERM.
(SECONDS)
DEFEAT SWITCH-
OVER DELAY (SEC-
ONDS) (Cut Jumper 1)
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 D
(b)  (EQUAL OR LESS THAN)
Table 3. LED FAULT CODES
LED
FAULT
FAULT
DESCRIPTION
CODES
Ambient Temp Sen-
1 FLASH sor is out of range
(open/shorted)
Coil Temp Sen-
2 FLASH sor is out of range
(open/shorted)
Low Pressure
3 FLASH
Switch is open
52 °F 52 °F
(b)
32 °F 32 °F
1 1
4 4
15 15
47°F 47°F
70° F 70° F
12 12
0 0
-12°F -12°F
-3 -3
YES YES
3 3
DEFROST
CONTROL
BEHAVIOR
Initiate defrost after
every 60 minutes of
runtime. Defrost will
terminate on coil
temp. See Note 1 & 2.
Initiate a 15 minute
forced defrost after
every 60 minutes of
runtime. See Note 1
& 2.
3 flash goes away
when/if LPCO closes.
18-BC118D1-1A-EN