Table of Contents
Advertisement
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 Open control is used with EconoMi$er2 (option
or accessory) for outdoor air management. The damper
position is controlled directly by the RTU Open control;
EconoMi$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
sensor
2
Outdoor air CO
sensor
2
Field Connections
Field connections for accessory sensors and input devices
are made the RTU Open, at plugs J1, J2, J4, J5, J11 and
J20. All field control wiring that connects to the RTU
Open must be routed as shown in Fig. 42. 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 —
SPT sensors available from Bryant are resistive input
non-communicating (T55, T56, and T59) sensors. These
sensors have a variety of options consisting of: timed
override button, set point adjustment, and a LCD screen.
Space temperature can be also be written to from a
building network or zoning system. However, it is still
recommended that return air duct sensor be installed to
allow stand-alone operation for back-up. Refer to the
configuration
section
for
configurations associated with space sensors.
Field connections to T- - 55, T- - 56 and T- - 59 are provided as
examples.
S 33ZCT55SPT, space temperature sensor with override
button (T- - 55)
S 33ZCT56SPT, space temperature sensor with override
button and setpoint adjustment (T- - 56)
S 33ZCT59SPT, space temperature sensor with LCD
(liquid crystal display) screen, override button, and
setpoint adjustment (T- - 59)
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.
details
on
controller
Connect T- - 55: See Fig. 50 for typical T- - 55 internal
connections. Connect the T- - 55 SEN terminals to RTU Open
J20- - 1 and J20- - 2. See Fig. 51.
1
2
3
4
5
SEN
SW1
BRN (GND)
BLU (SPT)
Fig. 50 - - T- - 55 Space Temperature Sensor Wiring
SEN
SEN
Fig. 51 - - RTU Open T- - 55 Sensor Connections
Connect T- - 56: See Fig. 52 for T- - 56 internal connections.
Install a jumper between SEN and SET terminals as
illustrated. Connect T- - 56 terminals to RTU Open J20- - 1,
J20- - 2 and J20- - 3 per Fig. 53.
1
2
3
4
5
SEN
SET
SW1
Cool
Warm
Fig. 52 - - T- - 56 Internal Connections
29
6
RED(+)
WHT(GND)
CCN COM
BLK(-)
SENSOR WIRING
C08201
J20-1
J20-2
C08460
6
RED(+)
WHT(GND)
CCN COM
BLK(-)
BLK
(T56)
BRN (GND)
SENSOR WIRING
BLU (SPT)
JUMPER
TERMINALS
AS SHOWN
C08202
Advertisement
Table of Contents
