Trane A4HP4 User Manual

18 88-A4HP4001-1G-EN
TEMP °F TEMP °C
THERMISTOR
RESISTANCE
(OHMS)
Volts DC
-15.00 -26.11 135976 2.50
-10.00 -23.33 115112 2.40
-5.00 -20.56 97745 2.29
0.00 -17.78 83247 2.17
5.00 -15.00 71108 2.05
10.00 -12.22 60916 1.93
15.00 -9.44 52333 1.81
20.00 -6.67 45076 1.69
25.00 -3.89 38927 1.56
30.00 -1.11 33703 1.45
35.00 1.67 29253 1.33
40.00 4.44 25452 1.22
45.00 7.22 22198 1.12
50.00 10.00 19405 1.02
55.00 12.78 17002 0.93
60.00 15.56 14930 0.85
65.00 18.33 13138 0.77
70.00 21.11 11586 0.70
75.00 23.89 10238 0.63
80.00 26.67 9065 0.57
85.00 29.44 8043 0.52
90.00 32.22 7150 0.47
95.00 35.00 6368 0.42
100.00 37.78 5682 0.38
105.00 40.56 5079 0.35
110.00 43.33 4548 0.31
115.00 46.11 4079 0.28
120.00 48.89 3665 0.26
125.00 51.67 3298 0.23
130.00 54.44 2972 0.21
135.00 57.22 2683 0.19
Example:
Sensor temp. = 19°F
Measured Resistance = 46K ohms
This sensor is good since the measured value is
relatively close to the chart value.
Table 1. Defrost Control Thermistor Table Table 2. DEMAND DEFROST QUICK SPECS
DEFROST ENABLED:
Y = ON COIL TEM-
PERATURE
52 °F
(b)
52 °F
DEFROST PERMIT: Y
= ON COIL TEMPERA-
TURE
32 °F 32 °F
MIN DEFROST TIME
(MINUTES)
11
TARGET DEFROST
TIME (MINUTES)
44
MAX TIME OVERRIDE
(MINUTES +)
15 15
DEFROST TERMI-
NATE COIL TEM-
PERATURE (Factory
Setting)
47°F 47°F
DEFROST HI TERMI-
NATE COIL TEMPER-
ATURE (Cut Jumper 2)
70° F 70° F
SOV SWITCH-OVER
DELAY AFTER
DEFROST TERM.
(SECONDS)
12 12
DEFEAT SWITCH-
OVER DELAY (SEC-
ONDS) (Cut Jumper 1)
00
LOW AMBIENT HEAT
PUMP LOCK OUT
-12°F -12°F
LOW AMBIENT HEAT
PUMP RESUME
-3 -3
LPCO INPUT TO
CONTROL
YES YES
LPCO BYPASS IN/
OUT DEFROST
(MINUTES)
33
COMPRESSOR SCROLL SCROLL
MNEMONIC NO CNT CNT08177 CNT08176
GROUP NOMENCLA-
TURE
(a)
D161244G01 D161246G02
SUPERSEDURE CNT 07824 07825
OD FAN TYPE – PSC/
ECM
PSC ECM
1-SPD 1-SPD
(a) GROUP suffix for drawing number D
(b)  (EQUAL OR LESS THAN)
LED
FAULT
CODES
FAULT
DESCRIPTION
DEFROST
CONTROL
BEHAVIOR
1 FLASH
Ambient Temp Sen-
sor is out of range
(open/shorted)
Initiate defrost after
every 60 minutes of
runtime. Defrost will
terminate on coil
temp. See Note 1 & 2.
2 FLASH
Coil Temp Sen-
sor is out of range
(open/shorted)
Initiate a 15 minute
forced defrost after
every 60 minutes of
runtime. See Note 1
& 2.
3 FLASH
Low Pressure
Switch is open
3 flash goes away
when/if LPCO closes.
Table 3. LED FAULT CODES

Trane A4HP4 Specifications

General

Brand	Trane
Model	A4HP4
Category	Heat Pump
Language	English