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Communication Wiring -- Protocols

General —

Protocols are the communication languages spoken by

control devices. The main purpose of a protocol is to

communicate information in the most efficient method

possible. Different protocols exist to provide different

kinds of information for different applications. In the BAS

application, many different protocols are used, depending

on manufacturer. Protocols do not change the function of

a controller; just make the front end user different.

The RTU Open controller can be set to communicate on

four different protocols: BACnet, Modbus, N2, and

LonWorks. Switch 3 (SW3) on the board is used to set

protocol and baud rate. Switches 1 and 2 (SW1 and SW2)

are used to set the board’s network address. See Fig. 55

and 56 for protocol switch settings and address switches.

The third party connection to the RTU Open controller is

through plug J19. See Fig. 57 for wiring.

NOTE

: Power must be cycled after changing the SW1--3

switch settings.
Contact your Bryant applications engineer for more

detailed information on protocols, third party wiring, and

networking.

SW3 Protocol Selection

PROTOCOL

DS8

DS7

DS6

DS5

DS4

DS3

DS2

DS1

BACnet MS/TP

(Master)

Unused

OFF

Select Baud Select Baud

Modbus

(Slave)

Unused

OFF

Select Baud Select Baud

(Slave)

Unused

OFF

LonWorks

Unused

OFF

NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown

Baud Rate Selections

BAUD RATE

DS2

DS1

9600

OFF

19,200

OFF

38,400

OFF

76,800

C07166

Fig. 55 -- RTU Open Controller SW3 Dip Switch Settings

C10815

Fig. 56 -- RTU Open Controller Address Switches

C10816

Fig. 57 -- Network Wiring

Содержание 551J Series

Страница 1: ...d Power Supply 14 Units With Factory Installed Non Fused Disconnect 15 Units Without Factory Installed Non Fused Disconnect 16 All Units 16 Convenience Outlets 17 Factory Option Thru Base Connections 18 Units Without Thru Base Connections 18 Field Control Wiring 18 Thermostat 18 Central Terminal Board 19 Unit Without Thru Base Connection Kit 19 Heat Anticipator Settings 19 Electric Heaters 19 Sing...

Страница 2: ...ty alert symbol When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury Understand the signal words DANGER WARNING CAUTION and NOTE These words are used with the safety alert symbol DANGER identifies the most serious hazards which will result in severe personal injury or death WARNING signifies hazards which could result in personal injury ...

Страница 3: ...s 1 Standard Static Option Belt Drive 2 Medium Static Option Belt Drive 3 High Static Option Belt Drive Cooling Tons 07 6 ton 08 7 5 ton 09 8 5 ton 11 10 ton 12 0 EER 12 10 ton 11 7 EER Packaging and 2 Speed Indoor Fan Motor A Standard Packaging electro mechanical controls that require W7212 EconoMi er IV B LTL Packaging electro mechanical controls that require W7212 EconoMi er IV C Standard Packa...

Страница 4: ...4 C160142 Fig 2 Dimensional Drawing Sizes 07 09 ...

Страница 5: ...5 C160143 Fig 2 Unit Dimensional Drawing Sizes 07 09 cont ...

Страница 6: ...6 C13302A Fig 3 Dimensional Drawing Sizes 11 and 12 ...

Страница 7: ...7 C13303A Fig 3 Unit Dimensional Drawing Sizes 11 and 12 cont ...

Страница 8: ... with unit lifting or rigging Step 1 Plan for Unit Location Select a location for the unit and its support system curb or other that provides for minimum clearances required for safety including clearance to combustible surfaces unit performance and service access below around and above unit as specified in unit drawings See Fig 4 NOTE Consider also the effect of adjacent units Unit may be install...

Страница 9: ...rements listed on unit data plate agree with power supply provided On units with hinged panel option check to be sure all latches are snug and in closed position Locate the carton containing the outside air hood parts see Fig 10 Do not remove carton until unit has been rigged and located in final position Step 4 Provide Unit Support Roof Curb Mount Accessory roof curb details and dimensions are sh...

Страница 10: ... CARRIER CORPORATION 1 DEC 2 DEC 3 DEC ANG MATERIAL AUTHORIZATION NUMBER TITLE 1029120 CURB ASY ROOF ENGINEERING MANUFACTURING ENGINEERING REQUIREMENTS SIZE DRAWING NUMBER REV T 005 Y 002 DRAFTER CHECKER D 50HJ405012 C WEIGHT MMC 12 16 09 SHEET 5 OF 5 SURFACE FINISH MFG PURCH MODEL INTERNAL USE ONLY NEXT DRAWING SCALE DISTRIBUTION PURCH N A NOTES 1 ROOFCURB ACCESSORY IS SHIPPED DISASSEMBLED 2 INSU...

Страница 11: ...ctwork Outlet grilles must not lie directly below unit discharge PERSONAL INJURY HAZARD Failure to follow this warning could cause personal injury For vertical supply and return units tools or parts could drop into ductwork and cause an injury Install a 90 degree turn in the return ductwork between the unit and the conditioned space If a 90 degree elbow cannot be installed then a grille of suffici...

Страница 12: ...higher level runoff and overhangs UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage All panels must be in place when rigging Unit is not designed for handling by fork truck CAUTION After unit is in position remove rigging skids and shipping materials Step 7 Convert to Horizontal and Connect Ductwork when required Unit is shipped in the vertical duct configuration Uni...

Страница 13: ... metal tray through the filter access opening and assemble per the steps outlined in Economizer Hood and Two Position Hood Economizer Hood and Two Position Hood NOTE If the power exhaust accessory is to be installed on the unit the hood shipped with the unit will not be used and must be discarded Save the aluminum filter for use in the power exhaust hood assembly 1 The indoor coil access panel wil...

Страница 14: ... PLUG ROOF CURB SEE NOTE 3 76 mm MIN a50 9660 Fig 15 Condensate Drain Piping Details All units must have an external trap for condensate drainage Install a trap at least 4 in 102 mm deep and protect against freeze up If drain line is installed downstream from the external trap pitch the line away from the unit at 1 in per 10 ft 25 mm in 3 m of run Do not use a pipe size smaller than the unit conne...

Страница 15: ...only per pole on optional non fused disconnect See Fig 16 and the unit label diagram for field power wiring connections NOTE TEST LEADS Unit may be equipped with short leads pigtails on the field line connection points on contactor C or optional disconnect switch These leads are for factory run test purposes only remove and discard before connecting field power wires to unit connection points Make...

Страница 16: ... for power wiring connections to the unit power terminal blocks and equipment ground Maximum wire size is 4 ga AWG copper only per pole on contactors and 2ga AWG copper only per pole on optional non fused disconnect Provide a ground fault and short circuit over current protection device fuse or breaker per NEC Article 440 or local codes Refer to unit informative data plate for MOCP Maximum Over cu...

Страница 17: ...1 2 in 13 mm under screw heads are exposed Press the gasket over the screw heads Slip the backing plate over the screw heads at the keyhole slots and align with the gasket tighten the two screws until snug do not over tighten Mount the weatherproof cover to the backing plate as shown in Fig 22 Remove two slot fillers in the bottom of the cover to permit service tool cords to exit the cover Check f...

Страница 18: ...ge power wires to pass through the basepan See Fig 24 LOW VOLTAGE CONDUIT CONNECTOR HIGH VOLTAGE CONDUIT CONNECTOR C13412 Fig 24 Thru Base Connection Fittings Check tightness of connector lock nuts before connecting electrical conduits Field supplied and field installed liquid tight conduit connectors and conduit may be attached to the connectorson the basepan Pull correctly rated high voltage and...

Страница 19: ...ucture of the unit The CTB does not provide any microprocessor control it is simply a basic multifunction wiring terminal configuration Unit Without Thru Base Connection Kit Pass the thermostat control wires through the hole provided in the corner post then feed the wires through the raceway built into the corner post to the control box Pull the wires over to the terminal strip on the upper left c...

Страница 20: ...eparating the indoor section with electric heaters from the outdoor section The Single Point Box has a hinged access cover See Fig 30 The Single Point Box also includes a set of power taps and pigtails to complete the wiring between the Single Point Box and the unit s main control box terminals Refer to the accessory heater and Single Point Box installation instructions for details on tap connecti...

Страница 21: ...nits equipped with belt drive motors The Perfect Humidity dehumidification system requires a field supplied and installed space relative humidity control device This device may be a separate humidistat control contact closes on rise in space RH above control setpoint or a combination thermostat humidistat control device with isolated contact set for dehumidification control The humidistat is norma...

Страница 22: ...Wiring Rc Rh W1 G Y2 C O W2 B Y1 OAT RRS SRTN HUM D1 D2 V Vg X C G W2 W1 Y2 Y1 R Programable Thermostat Unit CTB THERMOSTAT Connection not required Perfect Humidity FIOP C12743 Fig 33 Typical Rooftop Unit with Perfect Humidity Dehumidification System with a Programmable Thermostat ...

Страница 23: ...CV Specifications W7220 Economizer Module The module is designed for use with 2 to 10 Vdc or bus communicating actuator The module includes terminals for CO2 sensor mixed air sensor and an outdoor dry bulb sensor Enthalpy and other options are available with bus sensors User Interface Provides status for normal operation setup parameters checkout tests and alarm and error conditions with a 2 line ...

Страница 24: ... Table 3 Economizer Module Left Hand Terminal Blocks Label Type Description Top Left Terminal Block MAT MAT 20k NTC and COM Supply Air Temperature Sensor polarity insensitive connection OAT OAT 20k NTC and COM Outdoor Air Temperature Sensor polarity insensitive connection S BUS S BUS S Bus Sylk Bus Enthalpy Control Sensor polarity insensitive connection Bottom Left Terminal Block IAQ 2 10 2 10 Vdc...

Страница 25: ...le CO2 Sensor Wiring When using a CO2 sensor the black and brown common wires are internally connected and only one is connected to IAQ COM on the W7220 Use the power from the W7220 to power the CO2 sensor OR make sure the ground for the power supplies are common See Fig 37 for CO2 sensor wiring CO2 SENSOR 24V ANALOG OUT L1 HOT L2 RED BLACK YELLOW BROWN ORANGE GREEN POWER SUPPLY PROVIDE DISCONNECT...

Страница 26: ...ters appear and only MIN POS will display If you have a CO2 sensor the DCV MIN and DCV MAX will appear AND if you have 2 speed fan DCV MIN high and low speed and DCV MAX high and low speed will appear NOTE Some parameters in the menus use the letters MA or MAT indicating a mixed air temperature sensor location before the cooling coil This unit application has the control sensor located after the c...

Страница 27: ...ensor sends invalid value if not connected short or out of range RA HUM _ _ 0 to 100 RETURN AIR RELATIVE HUMIDITY Accessory enthalpy sensor required Displays measured value of return air humidity from RA sensor Displays if sensor sends invalid value if not connected short or out of range IN CO2 _ _ _ ppm 0 to 2000 ppm SPACE RETURN AIR CO2 CO2 sensor required accessory or factory option Displays va...

Страница 28: ...fault for MIN POS L is 3 2V and MIN POS H is 2 8V VENTMAX 2 8 V 2 to 10 Vdc DCV MAXIMUM DAMPER POSITION Displays only if a CO2 sensor is connected Used for Vbz ventilation max cfm setpoint VENTMAX is the same setting as MIN POS would be if you did not have the CO2 sensor 100 to 9990 cfm increment by 10 If OA MA RA and CO2 sensors are connected and DCV CAL ENABLE is set to AUTO mode the OA dampers ...

Страница 29: ...YES LCD will briefly flash YES and change to NO but all parameters will change to the factory default values NOTE RECHECK AUX2 IN and FANTYPE for required 2 speed values ADVANCED SETUP MA LO SET 45_F 7_C 35 to 65_F 2 to 18_C Incremented by 1_ SUPPLY AIR TEMPERATURE LOW LIMIT Temperature to activate Freeze Protection close damper and alarm if temperature falls below setup value FREEZE POS CLO CLO o...

Страница 30: ...EMPERATURE CALIBRATION Allows for the operator to adjust for an out of calibration discharge air temperature DAT sensor 2SP FAN DELAY 5 Minutes 0 to 20 minutes in 1 minute increments TIME DELAY ON 2nd STAGE ECONOMIZING When in economizing mode this is the delay for the high speed fan to try to satisfy the call for second stage cooling before the first stage mechanical cooling is enabled CHECKOUT D...

Страница 31: ...the alarm will go away Must have OA MA and RA sensors for DCV calibration set up is in the Advanced setup menu DA SENS ALM n a n a DISCHARGE AIR TEMPERATURE SENSOR ALARM Discharge air temperature is out of the range set in the ADVANCED SETUP Menu Check the temperature of the discharge air SYS ALARM n a n a When AUX1 O is set to SYS and there is any alarm e g failed sensors etc the AUX1 O terminal ...

Страница 32: ...tage of mechanical cooling Y2 O after the delay if the call for Y1 I and Y2 I have not been satisfied Table 10 Dry Bulb Operation With DCV CO2 Sensor 1 Speed Fan Demand Controlled Ventilation DCV Outside Air Good to economize Y1 I Y2 I Fan Speed Y1 O Y2 O Occupied Unoccupied Below CO2 set No Off Off High 0 v Off 0 v Off VENTMIN Closed On Off High 24 v On 0 v Off VENTMIN Closed On On High 24 v On 2...

Страница 33: ...osed On Off High 24 v On 0 v Off VENTMIN Closed On On High 24 v On 24 v On VENTMIN Closed Yes Off Off High 0 v Off 0 v Off VENTMIN Closed On Off High 0 v Off 0 v Off VENTMIN to Full Open Closed to Full Open On On High 24 v On 0 v Off VENTMIN to Full Open Closed to Full Open Above set No Off Off High 0 v Off 0 v Off VENTMIN to VENTMAX Closed On Off High 24 v On 0 v Off VENTMIN L to VENTMAX Closed O...

Страница 34: ...n DCV Outside Air Good to economize Y1 I Y2 I Fan Speed Y1 O Y2 O Occupied Unoccupied Below set No Off Off Low 0 v Off 0 v Off VENTMIN L Closed On Off Low 24 v On 0 v Off VENTMIN L Closed On On High 24 v On 24 v On VENTMIN H Closed Yes Off Off Low 0 v Off 0 v Off VENTMIN L Closed On Off Low 0 v Off 0 v Off VENTMIN L to Full Open Closed to Full Open On On High 24 v On 0 v Off VENTMIN H to Full Open...

Страница 35: ...Open Closed to Full Open With stage 3 delay STG3 DLY in Advanced setup menu can turn on second stage of mechanical cooling Y2 O after the delay if the call for Y1 I and Y2 I have not been satisfied With 2SP FAN DELAY Advanced Setup Menu when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for second stage cooling by turning on the fan to high and opening ...

Страница 36: ...nd fan on high speed and the call will turn off OR S If the call for additional cooling in the space has not been satisfied then the first stage of mechanical cooling will be enabled through Y1 Out or Y2 Out Checkout Inspect all wiring connections at the economizer module s terminals and verify compliance with the installation wiring diagrams For checkout review the Status of each configured param...

Страница 37: ...ing the operation of the system as a test that the system is operable EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage Be sure to allow enough time for compressor startup and shutdown between checkout tests so that you do not short cycle the compressors CAUTION Troubleshooting Alarms The economizer module provides alarm messages that display on the 2 line LCD N...

Страница 38: ... Open Controller Inputs and Outputs for locations of all connections to the RTU Open controller board NOTE The RTU Open controller acts as an intelligent imbedded thermostat A room thermostat cannot be used with the RTU Open controller J4 J2 J1 J5 J5 J22 J17 J19 J14 J11 J3 J13 J12 J15 J20 Network Comm Configurable Input_8 24 VAC Configurable Input_5 24 VAC Configurable Input_3 24 VAC Input_9 Humid...

Страница 39: ...39 a551J 006 Fig 41 RTU Open Controller Wiring Diagram ...

Страница 40: ...40 a551J 007 Fig 42 Typical RTU Open Controller Wiring Diagram Wiring Diagram with Perfect Humidityt System ...

Страница 41: ...3 Relay State comp_3 BO Relay 24VAC 1A J11 5 and 6 Binary Output 7 Y3 Heat 1 Relay State heat_1 BO Relay 24VAC 1A J1 6 Binary Output 3 W1 Heat 2 Relay State heat_2 BO Relay 24VAC 1A J1 5 Binary Output 2 W2 Power Exhaust Relay State pexh BO Relay 24VAC 1A J11 2 and 3 N O Binary Output 8 PE Dehumidification Relay dehum BO Relay 24VAC 1A J11 7 and 8 N O Binary Output 6 LEGEND AI Analog Input AO Analo...

Страница 42: ...ed 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 S 33ZCT56SPT space temperature sensor with override button and setpoint adjustment S 33ZCT59SPT space temperature sensor with LCD liquid crystal dis...

Страница 43: ...ucts open windows fans or over heat sources Allow at least 3 ft 0 9 m between the sensor and any corner Avoid mounting the sensor where it is influenced by the supply air the sensor gives inaccurate readings if the supply air is blown directly onto the sensor or if the supply air does not have a chance to mix with the room air before it is drawn into the return airstream To controller 24 Vac Line ...

Страница 44: ...rate the dehumidification function for the unit Disconnect the J11 Phoenix style connector from the board and use the plug screws to secure the wires as follows secure the PNK BLK wires at pin 7 and the PNK wires at pin 8 and then reconnect the plug to the board at J11 Relative Humidity Sensors Space or Duct Mounted The accessory space humidity sensor 33ZCSENSRH 01 or duct humidity sensor 33ZCSEND...

Страница 45: ...hen installing this accessory the unit must be configured for filter status by setting MENU Config Inputs input 3 5 8 or 9 to Filter Status and normally open N O or normally closed N C Input 8 or 9 is recommended for easy of installation Refer to Fig 40 and Fig 41 or Fig 42 for wire terminations at J5 Fan Status The fan status accessory is a field installed accessory This accessory detects when th...

Страница 46: ... address See Fig 55 and 56 for protocol switch settings and address switches The third party connection to the RTU Open controller is through plug J19 See Fig 57 for wiring NOTE Power must be cycled after changing the SW1 3 switch settings Contact your Bryant applications engineer for more detailed information on protocols third party wiring and networking SW3 Protocol Selection PROTOCOL DS8 DS7 D...

Страница 47: ...udes a USB Link Cable The link cable connects a USB port to the J12 local access port See Fig 58 RTU Open Controller Troubleshooting Communication LEDs The LEDs indicate if the controller is speaking to the devices on the network The LEDs should reflect communication traffic based on the baud rate set The higher the baud rate the more solid the LEDs will appear See Table 19 NOTE Refer to the RTU O...

Страница 48: ...nthalpy Control P N 33CSENTHSW The enthalpy control 33CSENTHSW is available as a field installed accessory to be used with the EconoMi erR2 damper system The outdoor air enthalpy sensor is part of the enthalpy control The separate field installed accessory return air enthalpy sensor 33CSENTSEN is required for differential enthalpy control See Fig 59 Locate the enthalpy control in the economizer ne...

Страница 49: ...tector configuration to meet project requirements Units equipped with factory optional Return Air smoke detectors require a relocation of the sensor module at unit installation See Fig 61 for the as shipped location Completing Installation of Return Air Smoke Sensor 1 Unscrew the two screws holding the Return Air Smoke Detector assembly See Fig 62 Step 1 Save the screws 2 Turn the assembly 90 degr...

Страница 50: ...uence at terminals marked OCCUPANCY on CTB Remove or cut jumper JMP 2 to complete the installation Step 12 Install Accessories Available accessories include Roof curb Thru base connection kit must be installed before unit is set on curb Electric heaters and single point connection kits Manual outside air damper Two position motorized outside air damper Low ambient controls Thermostat sensors Econo...

Страница 51: ...motor shaft and the blower shaft 2 Set the tension gauge to the desired tension see Table 1 in Fig 64 Place the large O ring at that point 3 Press the tension checker downward on the belt until the large O ring is at the bottom of the straightedge 4 Adjust the belt tension as needed Adjust belt tension by loosing the motor mounting plate front bolts and rear bolt see Fig 65 and sliding the plate t...

Страница 52: ...LTS 4 C11504 Fig 65 Belt Drive Motor Mounting Pre Start and Start Up This completes the mechanical installation of the unit Refer to the unit s Service Manual for detailed Pre Start and Start Up instructions Download the latest versions from HVAC Partners www hvacpartners com ...

Страница 53: ...53 ...

Страница 54: ...eating Cooling Systems Edition Date 01 18 Printed in U S A Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations Catalog No II551J 7 12 04 Replaces II551J 7 12 03 ...

Страница 55: ...AIR INLET SCREENS ARE IN PLACE j VERIFY THAT UNIT IS LEVEL j CHECK FAN WHEELS AND PROPELLER FOR LOCATION IN HOUSING ORIFICE AND VERIFY SETSCREW IS TIGHT j VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED j VERIFY THAT SCROLL COMPRESSORS ARE ROTATING IN THE CORRECT DIRECTION j VERIFY INSTALLATION OF THERMOSTAT II START UP ELECTRICAL SUPPLY VOLTAGE L1 L2 L2 L3 L3 L1 COMPRESSOR AM...

Страница 56: ...LVE LSV ENERGIZED VALVE CLOSES j 6 SWITCH UNIT TO DEHUMID REHEAT BY OPENING Y1 OBSERVE j A SUCTION PRESSURE INCREASES TO NORMAL COOLING LEVEL j B DISCHARGE PRESSURE DECREASES 35 TO 50 PSI j C LIQUID TEMPERATURE RETURNS TO NORMAL COOLING LEVEL j D LIQUID SOLENOID VALVE LSV ENERGIZED VALVE CLOSES j E DISCHARGE SOLENOID VALVE DSV ENERGIZED VALVE OPENS j 7 WITH UNIT IN DEHUMID MODE CLOSE W1 COMPRESSOR...

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