Bryant 581J Field Connections, Space Temperature SPT Sensors, EconoMi$er2

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 CO2 sensor

Outdoor air CO2 sensor

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 through the raceway built into the corner post as shown in Fig. 30. 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. Connect to the wires to the removable Phoenix connectors and then reconnect the connectors to the board.

Space Temperature (SPT) Sensors —

There are 2 types of SPT sensors available from Bryant, resistive input non-communicating (T55, T56, and T59) and Rnet communicating (SPS, SPPL, SPP, and SPPF) sensors. Each type has a variety of options consisting 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 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

1	2	3	4	5	6	RED(+)
					WHT(GND)		CCN COM
						BLK(-)
			SEN
	SW1
					BRN (GND)		SENSOR WIRING
					BLU (SPT)

			C08201
Fig. 38 - T-55 Space Temperature Sensor Wiring				581J
	SEN	J20-1

SEN J20-2

Fig. 39 - RTU Open T-55 Sensor ConnectionsC08460

Connect T-56:See Fig. 40 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. 41.

1	2	3	4	5	6	RED(+)
					WHT(GND)		CCN COM
						BLK(-)
			SEN		SET
	SW1					BLK
						(T56)
					BRN (GND)		SENSOR WIRING
					BLU (SPT)
							JUMPER
							TERMINALS
							AS SHOWN

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. 38 for typical T-55 internal connections. Connect the T-55 SEN terminals to RTU Open J20-1 and J20-2. See Fig. 39.

Cool Warm

Fig. 40 - T-56 Internal Connections

SEN J20-1

SEN J20-2

Jumper

SET

SET J20-3

C08202

Fig. 41 - RTU Open T-56 Sensor ConnectionsC08461

27