Carrier 35L Series, Installation And Start-Up Instructions Manual

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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