Bryant 548J*14D - Manual (Page 22)

22
Outdoor Air Temperature (OAT) Sensor —
The OAT is factory--mounted in the EconoMi$er2 (FIOP
or accessory). It is a nominal 10k ohm thermistor attached
to an eyelet mounting ring.
EconoMi$er2 —
The RTU--MP control is used with EconoMi$er2 (option
or accessory) for outdoor air management. The damper
position is controlled directly by the RTU--MP control;
EconoMi$er2 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
2
sensor
Outdoor air CO
2
sensor
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 as shown in Fig. 28. This routing provides
the UL required clearance between high-- and low--voltage
wiring. Connect to the wires to the removable Phoenix
connectors and then reconnect the connectors to the board.
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. 37 for typical T--55 internal
connections. Connect the T--55 SEN terminals to
RTU--MP J20--1 and J20--2. See Fig. 38.
2 3 4 5 6 1
SW1
SEN
BRN (GND)
BLU (SPT)
RED(+)
WHT(GND)
BLK(-)
CCN COM
SENSOR WIRING
C08201
Fig. 37 -- T--55 Space Temperature Sensor Wiring
SEN
SEN
J20-1
J20-2
C08460
Fig. 38 -- RTU--MP T--55 Sensor Connections
Connect T--56: See Fig. 39 for T--56 internal connections.
Install a jumper between SEN and SET terminals as
illustrated. Connect T--56 terminals to RTU--MP J20--1,
J20--2 and J20--3 per Fig. 40.
2 3 4 5 6 1
SW1
SEN SET
Cool Warm
BRN (GND)
BLU (SPT)
RED(+)
WHT(GND)
BLK(-)
CCN COM
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
BLK
(T56)
C08202
Fig. 39 -- T--56 Internal Connections
548J
*14D