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EconoMi$er2 —
The RTU Open controller is used with EconoMi$er2
(option or accessory) for outdoor air management. The
damper position is controlled directly by the RTU Open
controller; 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 to the RTU Open controller, at plugs J1, J2, J4,
J5, J11 and J20. All field control wiring that connects to
the RTU Open controller must be routed through the
raceway built into the corner post as shown in Fig. 32.
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 Open controller.
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
details on controller configurations associated with space
sensors.
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.
Connect T−55: See Fig. 39 for typical T−55 internal
connections. Connect the T−55 SEN terminals to the RTU
Open controller at J20−1 and J20−2. See Fig. 40.
1
2
3
4
5
SEN
SW1
BRN (GND)
BLU (SPT)
Fig. 39 − T−55 Space Temperature Sensor Wiring
SEN
SEN
Fig. 40 − RTU Open Controller T−55 Sensor
Connections
Connect T−56: See Fig. 41 for T−56 internal connections.
Install a jumper between SEN and SET terminals as
illustrated. Connect T−56 terminals to the RTU Open
controller at J20−1, J20−2 and J20−3 per Fig. 42.
1
2
3
4
5
SEN
SET
SW1
Cool
Fig. 41 − T−56 Internal Connections
SEN
SEN
Jumper
SET
SET
Fig. 42 − RTU Open Controller T−56 Sensor
Connections
28
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
Warm
C08202
J20-1
J20-2
J20-3
C08461
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