Bryant 548J Service And Maintenance Instructions page 37

Table 15 – Thermistor Resistance vs Temperature
Values for Space Temperature Sensor, Supply Air
Temperature Sensor, and Outdoor Air Temperature
Sensor
TEMP TEMP
(C)
--- 40
--- 35
--- 30
--- 25
--- 20
--- 15
--- 10
--- 5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
NOTE: The sensor must be mounted in the discharge
airstream downstream of the cooling coil and any heating
devices. Be sure the probe tip does not come in contact
with any of the unit's heater surfaces.
Outdoor Air Temperature (OAT) Sensor — The OAT is
factory- - mounted in the EconoMi$er 2 (FIOP or accessory).
It is a nominal 10k ohm thermistor attached to an eyelet
mounting ring. See Table 15 for temperature- - resistance
characteristic.
EconoMi$er 2 — The RTU- - MP control is used with
EconoMi$er2 (option or accessory) for outdoor air
management. The damper position is controlled directly
by the RTU- - MP control; EconoMi$er 2 has no internal
logic device.
Outdoor air management functions can be enhanced with
field- - installation of these accessory control devices:
Enthalpy control (outdoor air or differential sensors)
Space CO sensor
2
Outdoor air CO sensor
2
Field Connections — Field connections for accessory
sensors and input devices are made the RTU- - MP, at plugs
J1, J2, J4, J5, J11 and J20. All field control wiring that
connects to the RTU- - MP must be routed through the
raceway built into the corner post as shown in Fig. 50.
The raceway provides the UL required clearance between
high- - and low- - voltage wiring. Pass the control wires
through the hole provided in the corner post, then feed the
wires thorough the raceway to the RTU- - MP. Connect to
the wires to the removable Phoenix connectors and then
reconnect the connectors to the board.
RESISTANCE
(F) (Ohms)
--- 40 335,651
--- 31 242,195
--- 22 176,683
--- 13 130,243
--- 4 96,974
5 72,895
14 55,298
23 42,315
32 32,651
41 25,395
50 19,903
59 15,714
68 12,494
77 10,000
86 8,056
95 6,530
104 5,325
113 4,367
122 3,601
131 2,985
140 2,487
149 2,082
158 1,752
RACEWAY
HOLE IN END PANEL (HIDDEN)
Fig. 50 - - Field Control Wiring Raceway
Space Temperature (SPT) Sensors
A field- - supplied Bryant space temperature sensor is
required with the RTU- - MP to monitor space temperature.
There are 3 sensors available for this application:
S 33ZCT55SPT, space temperature sensor with override
button
S 33ZCT56SPT, space temperature sensor with override
button and setpoint adjustment
S 33ZCT59SPT, space temperature sensor with LCD
(liquid crystal display) screen, override button, and
setpoint adjustment
Use 20 gauge wire to connect the sensor to the controller.
The wire is suitable for distances of up to 500 ft. Use a
three- - conductor shielded cable for the sensor and setpoint
adjustment connections. If the setpoint adjustment
(slidebar) is not required, then an unshielded, 18 or 20
gauge, two- - conductor, twisted pair cable may be used.
Connect T- - 55 - - See Fig. 51 for typical T- - 55 internal
connections. Connect the T- - 55 SEN terminals to
RTU- - MP J20- - 1 and J20- - 2. See Fig. 52.
1 2
3 4 5
WHT(GND)
SEN
SW1
BRN (GND)
BLU (SPT)
Fig. 51 - - T- - 55 Space Temperature Sensor Wiring
37
C08027
6
RED(+)
CCN COM
BLK(-)
SENSOR WIRING
C08201