Bryant 580J*16D Series, Installation Instructions Manual

Page: 54 / 64

54
The RTU Open controller requires the use of a Bryant space
sensor. A standard thermostat cannot be used with the RTU Open
controller system.
Supply Air Temperature (SAT) Sensor (33ZCSENSAT) — The
sensor is supplied with the 580J unit. This sensor is a tubular probe
type, approx 6-inches (152 mm) in length. It is a nominal
10-k ohm thermistor.
The SAT is factory-wired. The SAT probe is wire-tied to the
supply-air opening (on the horizontal opening end) in its shipping
position. Remove the sensor for installation. Re-position the sen-
sor in the flange of the supply-air opening or in the supply air duct
(as required by local codes). Drill or punch a 1 /
2
-in. hole in the
flange or duct. Use two field-supplied, self-drilling screws to se-
cure the sensor probe in a horizontal orientation. See Fig. 72.
Fig. 72 — Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
Outdoor Air Temperature (OAT) Sensor — The OAT sensor is
factory-mounted in the EconoMi$er ® 2 (FIOP or accessory). It is a
nominal 10k ohm thermistor attached to an eyelet mounting ring.
EconoMi$er 2 — The EconoMi$er 2 (option or accessory) is
used with the RTU Open controller for outdoor air management.
The damper position is controlled directly by the RTU Open con-
trol; EconoMi$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
2
sensor
• Outdoor air CO
2
sensor
FIELD CONNECTIONS — Field connections for accessory
sensors and input devices are made the RTU Open controller, at
plugs J1, J2, J4, J5, J11 and J20. All field control wiring that con-
nects to the RTU Open controller must be routed through the race-
way built into the corner post as shown in Fig. 54. 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 PCB con-
nectors and then reconnect the connectors to the board.
Space Temperature (SPT) Sensors — There are two types of
SPT sensors available from Bryant, resistive input non-communi-
cating (T55, T56, and T59) and Rnet communicating (SPS, SPPL,
SPP, and SPPF) sensors. Each type has a variety of options con-
sisting of: timed override button, set point adjustment, a LCD
screen, and communication tie in. 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 al-
low stand-alone operation for back-up. Refer to the configuration
section for details on controller configurations associated with
space sensors.
• 33ZCT55SPT, space temperature sensor with override
button (T-55)
• 33ZCT56SPT, space temperature sensor with override
button and setpoint adjustment (T-56)
• 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 un-
shielded, 18 or 20 gauge, two-conductor, twisted pair cable may
be used.
Connect T-55 — See Fig. 73 for typical T-55 internal connec-
tions. Connect the T-55 SEN terminals to the RTU Open con-
troller at J20-1 and J20-2. See Fig. 74.
Fig. 73 — T-55 Space Temperature Sensor Wiring
Fig. 74 — RTU Open T-55 Sensor Connections
Connect T- 56 — See Fig. 76 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. 76.
S UPPLY AIR RETURN AIR
S UPPLY AIR
TEMPERATURE
S EN S OR
ROOF
CURB
2
3 4 5
6 1
S W1
S EN
BRN (GND)
BLU ( S PT)
RED(+)
WHT(GND)
BLK(-)
CCN COM
S EN S OR WIRING
S EN
S EN
J20-1
J20-2