Bryant 580J*04--12 Manual de instalación descargar pdf (Pagina 8)

Resistive Non--Communicating Sensor Wiring

For sensor with setpoint adjustment up to 1000 ft (305m),

use three-conductor shielded cable 20 gauge wire to

connect the sensor to the controller. For non set point

adjustment (slidebar) or return air duct sensor, an

unshielded, 18 or 20 gauge, two-conductor, twisted pair

cable may be used. Below is the list of the connections of

the SPT to the RTU Open, refer to Fig. 5 and 6 for typical

connections at the sensor.

S J20-1 = temperature sensor input (SEN)

S J20-2 = sensor common

S J20-3 = Setpoint adjustment input (SET)

NOTE: See Fig. 7 for space temperature sensor averaging.

T55/56 Override button will no longer function when sensors

are averaged. Only Sensor 1 T56 STO input can be used.

SW1

SEN

SET

Cool Warm

BRN (GND)

BLU (SPT)

SENSOR WIRING

JUMPER

TERMINALS

AS SHOWN

BLK

(T56)

C07131

Fig. 5 -- Space Temperature Sensor

Typical Wiring (33ZCT56SPT)

OR SET SEN

OPB COM- PWR+

BLU (SPT)

BLK (STO)

24 VAC

SENSOR

WIRING

POWER

WIRING

BRN (COM)

NOTE: Must use a separate isolated transformer.

J20-3

J20-2

J20-1

C10291

Fig. 6 -- Space Temperature Sensor

Typical Wiring (33ZCT59SPT)

Rnet Communicating Sensor Wiring

The Rnet bus allows local communication with the RTU

Open, including communicating sensors. The Rnet bus

can hold up to 6 devices in the following combinations

wired in daisy-chain or hybrid configuration:

S 1-4 ZS--BNK sensor(s)

S 1 ZSPL--BNK or ZSP--BNK sensor

S 1-4 SPS sensor(s), and 1ZSPL--BNK or ZSP--BNK sensor

S Any of the above combinations, plus CO

or RH

combination

NOTE: Additional ZS sensors must be addressed. Use

the jumpers on the ZS sensor’s circuit board and refer to

the sensor installation instructions for addressing.

For Rnet wiring up to 500ft (152m), use 18 AWG 4

conductor unshielded plenum rated cable. The RTU Open’s

J13-RNET connection has a 4 pin Phoenix connector wired

as described below, Fig. 8 shows sensor Rnet wiring.

S RNET -- 1 = Signal ground (GND)

S RNET -- 2 = Signal (Rnet+)

S RNET -- 3 = Signal (Rnet--)

S RNET -- 4 = Power (+12v)

Sensor Averaging

Non--communicating sensors:

See Fig. 7 for space temperature sensor averaging

configurations, only combinations of 4 or 9 sensors will

operate correctly.

NOTE: T55/T56 Override button will no longer function

when sensors are averaged. Only 1 T56 STO input can be

used. Non--communication CO

sensors can not be

averaged.

Communicating sensors:

Any combination of sensors described in the “Rnet

Communicating Sensor Wiring” section can be used.

NOTE: Communicating CO

sensors and RH sensors can

be averaged if within the realm described.

CO2 Sensor(s) (IAQ and OAQ)

The indoor air quality (IAQ) and outdoor air quality

(OAQ) sensors monitor carbon dioxide (CO

) levels. This

information is used to monitor the quality of air in terms

of parts per million (PPM). The same sensor is used for

inside, outside, and duct monitoring, except an aspirator

box is required for outside and duct mounting. The CO

sensor is preset for a range of 0 to 2000 ppm and a linear

mA output of 4 to 20. The rooftop unit may have a factory

installed CO

sensor on the side of the economizer

assembly in the return air section of the unit and is

pre-wired and pre-configured at the factory. For field

installed sensors, a field supplied transformer must be

used to power the sensor. Refer to the instructions

supplied with the CO

sensor for electrical requirements

and terminal locations. RTU Open configurations must be

changed after adding a CO

sensor. See below and Fig. 9

for typical CO

sensor wiring.

S J4--2 or J4--5 = 4--20mA signal input

S J4--3 or J4--6 = signal common

NOTE: The factory used J4-2&3 for CO

(IAQ) sensor

inputs.

TS---5580J---02

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Bryant 580J*04--12 Manual de instalación Pagina 8

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