Supply-Air Temperature Sensor; Space Temperature Sensor Installation; Wiring The Space Temperature Sensor - Carrier 35L Installation And Start-Up Instructions Manual

Supply-Air Temperature Sensor, Primary Air Temperature Sensor and Space Temperature Sensor
RESISTANCE TEMP
(Ohms) (F)
29481 32
28732 33
28005 34
27298 35
26611 36
25943 37
25295 38
24664 39
24051 40
23456 41
22877 42
22313 43
21766 44
21234 45
20716 46
20212 47
19722 48
19246 49
18782 50
18332 51
17893 52
17466 53
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-
1
pean / DIN standard. The use of a junction box to accommo-
4
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.
Table 8 — Thermistor Resistance vs Temperature Values for
RESISTANCE TEMP RESISTANCE
(Ohms) (F)
17050 54
16646 55
16253 56
15870 57
15497 58
15134 59
14780 60
14436 61
14101 62
13775 63
13457 64
13148 65
12846 66
12553 67
12267 68
11988 69
11717 70
11452 71
11194 72
10943 73
10698 74
10459 75
TEMP RESISTANCE
(Ohms) (F) (Ohms)
10227 76 6340
10000 77 6209
9779 78 6080
9563 79 5954
9353 80 5832
9148 81 5712
8948 82 5595
8754 83 5481
8563 84 5369
8378 85 5260
8197 86 5154
8021 87 5050
7849 88 4948
7681 89 4849
7517 90 4752
7357 91 4657
7201 92 4564
7049 93 4474
6900 94 4385
6755 95 4299
6613 96 4214
6475 97 4132
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
MANUFACTURER
Belden
Columbia
American
Quabik
Alpha
Manhattan
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.
1
Strip / -in. of insulation from each conductor. Cut the
4
shield and drain wire from the sensor end of the cable.
11
TEMP RESISTANCE TEMP
(F) (Ohms)
98 4051
99 3972
100 3895
101 3819
102 3745
103 3673
104 3603
105 3533
106 3466
107 3400
108 3335
109 3272
110 3210
111 3150
112 3090
113 3033
114 2976
115 2920
116 2866
117 2813
118 2761
119
Wiring
PART NUMBER
Regular Plenum
8205 88442
D6451 —
A21501 A48301
6130 —
1895 —
M13402 M64430
(F)
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140