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Table 8 — Thermistor Resistance vs Temperature Values for
Supply-Air Temperature Sensor, Primary Air Temperature Sensor and Space Temperature Sensor
SPACE TEMPERATURE SENSOR INSTALLATION AND
WIRING — The SPT sensor accessory is ordered separately
for field installation. It is installed on interior walls to measure
room space air temperature. See Fig. 12-16 and Table 8.
The wall plate accommodates both the NEMA (National
Electrical Manufacturing Association) standard and the Euro-
pean
1
/
4
DIN standard. The use of a junction box to accommo-
date the wiring is recommended for installation. The sensor
may be mounted directly on the wall, if acceptable by local
codes.
DO NOT mount the sensor in drafty areas such as near heat-
ing or air-conditioning ducts, open windows, fans, or over heat
sources such as baseboard heaters or radiators. Sensors mount-
ed in those areas will produce inaccurate readings.
Avoid corner locations. Allow at least 3 ft between the sen-
sor and any corner. Air in corners tends to be stagnant resulting
in inaccurate sensor readings.
Sensor should be mounted approximately 5 ft up from the
floor, in an area that best represents the average temperature
found in the space (zone).
The space temperature sensor cover includes a service jack
connector. If wiring connection is made to the service jack, the
connector can then be used to connect a network service tool
with the Carrier Comfort Network® system.
Before installing the space temperature sensor, decide
whether or not the service jack wiring connection will be made.
If connection is desired, the CCN communication cable should
be available at time of sensor installation, for convenient wir-
ing connections. The cable selected must meet the require-
ments for the entire network. See page 15 for CCN communi-
cation cable specifications.
Install and wire the space temperature sensor as follows:
NOTE: Space temperature sensor will be identified as T55 or
T56. Refer to Control Sequence drawings to determine which
SPT is part of the particular control package being installed.
(The difference between T55 and T56 is that T56 includes set
point adjustment capability.)
1. Locate the two Allen type screws at the bottom of the
sensor.
2. Turn the two screws clockwise to release the cover from
the sensor wall mounting plate.
3. Lift the cover from the bottom and then release it from
the top fasteners.
4. Feed the wires from the electrical box through the open-
ing in the center of the sensor mounting plate.
5. Using two no. 6-32 x 1 mounting screws (provided with
the sensor), secure the sensor to the electrical box.
6. Use 20 gage wire to connect the sensor to the controller.
This size is suitable for distances of up to 500 ft. Use a
three-conductor shielded cable for the sensor and set
point adjustment connections. The standard CCN com-
munication cable may be used. If the set point adjustment
(slide-bar) is not required, then an unshielded, 18 or 20
gage, two-conductor, twisted pair cable may be used. Re-
fer to Table 9.
The CCN network service jack requires a separate,
shielded CCN communication cable. Always use sepa-
rate cables for CCN communication and sensor wiring.
(Refer to Fig. 15 and 16 for wire terminations.)
7. Replace the cover by inserting the cover at the top of the
mounting plate first, then swing the cover down over the
lower portion. Rotate the two Allen head screws counter-
clockwise until the cover is secured to the mounting plate
and locked in position.
8. For more sensor information, see Table 8 for thermistor
resistance vs temperature values.
NOTE: Clean sensor with damp cloth only. Do not use
solvents.
Table 9 — Recommended Sensor and Device
Wiring
NOTE: Wiring is 20 gage, 2 conductor twisted cable.
WIRING THE SPACE TEMPERATURE SENSOR AND
SET POINT ADJUSTMENT SLIDEBAR — To wire the sen-
sor and slidebar, perform the following (see Fig. 15 and 16):
1. Identify which cable is for the sensor wiring.
2. Strip back the jacket from the cables for at least 3 inches.
Strip
1
/
4
-in. of insulation from each conductor. Cut the
shield and drain wire from the sensor end of the cable.
RESISTANCE
(Ohms)
TEMP
(F)
RESISTANCE
(Ohms)
TEMP
(F)
RESISTANCE
(Ohms)
TEMP
(F)
RESISTANCE
(Ohms)
TEMP
(F)
RESISTANCE
(Ohms)
TEMP
(F)
29481
32
17050
54
10227
76
6340
98
4051
120
28732
33
16646
55
10000
77
6209
99
3972
121
28005
34
16253
56
9779
78
6080
100
3895
122
27298
35
15870
57
9563
79
5954
101
3819
123
26611
36
15497
58
9353
80
5832
102
3745
124
25943
37
15134
59
9148
81
5712
103
3673
125
25295
38
14780
60
8948
82
5595
104
3603
126
24664
39
14436
61
8754
83
5481
105
3533
127
24051
40
14101
62
8563
84
5369
106
3466
128
23456
41
13775
63
8378
85
5260
107
3400
129
22877
42
13457
64
8197
86
5154
108
3335
130
22313
43
13148
65
8021
87
5050
109
3272
131
21766
44
12846
66
7849
88
4948
110
3210
132
21234
45
12553
67
7681
89
4849
111
3150
133
20716
46
12267
68
7517
90
4752
112
3090
134
20212
47
11988
69
7357
91
4657
113
3033
135
19722
48
11717
70
7201
92
4564
114
2976
136
19246
49
11452
71
7049
93
4474
115
2920
137
18782
50
11194
72
6900
94
4385
116
2866
138
18332
51
10943
73
6755
95
4299
117
2813
139
17893
52
10698
74
6613
96
4214
118
2761
140
17466
53
10459
75
6475
97
4132
119
MANUFACTURER
PART NUMBER
Regular
Plenum
Belden
8205
88442
Columbia
D6451
—
American
A21501
A48301
Quabik
6130
—
Alpha
1895
—
Manhattan
M13402
M64430
Summary of Contents for 35L Series
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