Owner's manual

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A0020659

May 2014 Rev. 3

Direct Digital Controls (DDC)

Installation, Operation, and Maintenance Manual

Save these instructions

. This document is the property of the owner of this equipment and is required

for future maintenance. Leave this document with the owner when installation or service is complete.

RECEIVING AND INSPECTION

Upon receiving unit, check for any interior and exterior damage, and if found, report it

immediately to the carrier. Also check that all accessory items are accounted for and are

damage free.

INSTALLATION & PROGRAMMING WARNING!!

Direct Digital Controls should only be set up by trained Controls Contractors or similarly

trained personnel. For proper operation, a thorough understanding of the total system design

is required. If you are unsure of the proper setup and operation of this unit, please contact

your onsite Controls Contractor.

Summary of content (20 pages)

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Direct Digital Controls (DDC) Installation, Operation, and Maintenance Manual RECEIVING AND INSPECTION Upon receiving unit, check for any interior and exterior damage, and if found, report it immediately to the carrier. Also check that all accessory items are accounted for and are damage free. INSTALLATION & PROGRAMMING WARNING!! Direct Digital Controls should only be set up by trained Controls Contractors or similarly trained personnel.
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TABLE OF CONTENTS WARRANTY .................................................................................................................................................. 3 INSTALLATION ............................................................................................................................................. 4 PREREQUISITES ..................................................................................................................................... 4 SITE PREPARATION ............
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WARRANTY This equipment is warranted to be free from defects in materials and workmanship, under normal use and service, for a period of 12 months from date of shipment. This warranty shall not apply if: 1. The equipment is not installed by a qualified installer per the MANUFACTURER’S installation instructions shipped with the product, 2. The equipment is not installed in accordance with federal, state and local codes and regulations, 3. The equipment is misused or neglected, 4.
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INSTALLATION It is imperative that this unit is installed and operated with the designed airflow and electrical supply in accordance with this manual. If there are any questions about any items, please call the service department at 1-866-784-6900 for warranty and technical support issues. PREREQUISITES SITE PREPARATION 1. This manual assumes that the unit has been physically installed in its proper location. 2. All ductwork connections should be complete 3.
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DDC PROTOCOL SELECTION 1. The appropriate DDC controls protocol is factory set using dip switches on the DDC controller. The four possible protocols are BACnet MS/TP, Metasys N2, Modbus, and LonWorks (LonTalk). Confirm the dip switch setting prior to startup. A table showing the dip switch configurations available is on the front label of the controller. Switches 1 and 2 control the BAUD rate. Switches 3 and 4 control the communication protocol. The factory BAUD rate 9600.
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2. Using the rotary switches, set the controllers address. The factory default is 03. The number used is arbitrary, so long as it doesn’t conflict with other unit addresses on the network. 3. For N2 or Modbus connections, the address set on the rotary switches is the unit’s slave address. 4. If the unit was powered up for any reason during the rotary setting adjustment, a power cycle needs to be performed to store the new address. 5. For LonWorks, the address is irrelevant, but must not be zero.
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SOFTWARE SETUP & NETWORK VARIABLES The DDC controller provides a fixed set of analog and binary variables for adjustment in the field. These variables are listed below for each language. All variables are factory set (if applicable) to the values as shown. The on-site DDC Controls Contractor should adjust values accordingly as required. LIST OF ANALOG VARIABLES (AV): AV: 1: Software Control Source. Use this variable to set the method of controlling the occupied/unoccupied status of the unit.
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AV: 4: Effective Heating Setpoint. This is the effective heating setpoint, after the inclusion of internal logic to prevent rapid ramp-up/down of the value. Properties - Fixed readout. Non-editable - BACnet Reference: eht_stpt - Modbus Register: 40017 - N2 Register: 9 - Lonworks ID: nvoEffHeatStp - Units of degrees Fahrenheit (can be changed in software) - Has a maximum rise of 5.0 Degrees per 1 minute from AV:3 - Has a maximum fall of 5.
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AV: 8: Cooling Stage 2 Offset. This is the offset value from AV:6, which will activate the second nd stage cooling. If the Intake Air Temperature rises above AV:6 + AV:8, 2 stage cooling will enable. Properties - Editable, precision to the tenth of a degree - BACnet Reference: cl_s2_ofst - Modbus Register: 40009 - N2 Register: 5 - Lonworks ID: nviCoolTwoOfst - Units of degrees Fahrenheit (can be changed in software) - Range: 1.0 to 30.0 AV: 9: Effective Discharge Air Temperature.
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AV: 12: Heating Valve Output. This is the output, in percentage, of the PID loop which feeds the heating valve. A value of 0% is low fire, and a value of 100% is high fire. Properties - Fixed readout. Non-editable. This value is determined by comparison of AV: 4 to AV: 9 using the PID loop - BACnet Reference: htg_vlv_out - Modbus Register: 40023 - N2 Register: 12 - Lonworks ID: nvoHeatVlvOut - Units of percentage - Range: 0.0 to 100.0% AV: 13: VFD Speed Input.
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AV: 16: Modulating Damper Output. This is the output, in volts (V), which is being sent to the modulating damper from the controller. This AV is simply a confirmation of receiving the input from AV:15. Properties - Fixed readout. Non-editable. - BACnet Reference: mod_dmp_out - Modbus Register: 40031 - N2 Register: 16 - Lonworks ID: nvoModDmpOut - Units of Volts - Range: 0.0 to 10.0 AV: 17: Heating Room Override Supply Air Setpoint.
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AV: 20: Space (Room) Air Temperature Sensor. This variable provides the room air temperature sensor reading from the field installed sensor. Properties - Fixed readout. Non-editable - BACnet Reference: rat_sensor_visible - Modbus Register: 40043 - N2 Register: 22 - Lonworks ID: nvoRoomTSensor - Range of -25.0 to 225.0 - Units of degrees Fahrenheit (can be changed in software) - Type II 10K Thermistor AV: 21: Heating Room Temperature Setpoint. This variable is used to activate the space heating function.
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LIST OF BINARY VARIABLES (BV): BV: 1: BV Unit Enable (BAS). This is the Unoccupied/Occupied switch used for BAS control of unit run condition. NOTE: AV:1 must be set to 2 for BV:1 to function. Properties - On/Off Switch. - BACnet Reference: enable_bas - Modbus Register: 3 - N2 Register: 3 - Lonworks ID: nviEnableBMS BV: 2: Occupancy Status. This is the Unoccupied/Occupied confirmation BV, used to confirm the occupied/unoccupied state of the unit.
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BV: 6: Outside Air Damper Command. This is the command to control the on/off state of the outside air damper. Used to confirm if the unit is calling for outside air damper to be open. Properties - Fixed readout. Status only. - Network Reference: oad_cmd - Modbus Register: 10006 - N2 Register: 6 - Lonworks ID: nvoDampCmd BV: 7: Outside Air Damper Status. This is the status of the Outside Air Damper. This will only show an On State when the damper end limit switch has been activated.
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BV: 11: 2nd Stage Cooling Command. This is the command used to activate the stage 2 cooling output from the controller. Properties - Fixed readout. Status only. - Network Reference: s2_clg_cmd - Modbus Register: 10001 - N2 Register: 1 - Lonworks ID: nvoCoolTwoCmd - Activates from either BV: 10 or when the call for second stage cooling logic is satisfied using AV: 2, AV: 7, and AV: 8 BV: 12: Heat On Command. This is the command used to activate the call for heat relay. Properties - Fixed readout.
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BV: 16: Room Override Status. This is the status of the room override space heating function. . Room Override will be On if the unit is operating in space heating mode. Properties - Fixed readout. Status only. - Network Reference: room_override - Modbus Register: 10008 - N2 Register: 8 - Lonworks ID: nvoRoomOver - This occurs when BV:17 is set to “On” or “Space” and the space temperature (AV:20) falls below the space heating setpoint (AV:21 minus AV:22). Used as a space heating function.
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- Activates if AV: 9, the Discharge Air Temperature, is greater than AV: 7, the cooling setpoint, plus 5.0 degrees, for 5 minutes. Cooling must be on for this alarm to occur. BV: 35 FREEZE: Freezestat. - Network Reference: freeze - Modbus Register: 10017 - N2 Register: 17 - Lonworks ID: nvoFreezeAlm - Activates if AV: 9, the Discharge Air Temperature, is less than 35 Degrees, and BV: 2 indicates that the unit is in the occupied state.
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- Network Reference: oad_rntm Modbus Register: 10023 N2 Register: 23 Lonworks ID: nvoOadRntmAlm Activates if BV: 7 has been in the On state for 10000 hours. BV: 42 SAT_HI: High Supply Air Temperature. - Network Reference: sat_hi - Modbus Register: 10024 - N2 Register: 24 - Lonworks ID: nvoSATHiAlm - Activates if AV: 9, the Discharge Air Temperature, is greater than 160 Degrees for 10:00 minutes, and the unit has proper airflow. BV: 43 SAT_LO: Low Supply Air Temperature.
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LOGIC MODIFICATION NOTES AV:1 AV:2 AV:3 AV:4 AV:5 AV:6 AV:7 AV:8 AV:9 AV:10 AV:11 AV:12 AV:13 AV:14 AV:15 AV:16 AV:17 AV:18 AV:19 AV:20 AV:21 AV:22 BV:1 BV:2 BV:3 BV:4 BV:5 BV:6 BV:7 BV:8 BV:9 BV:10 BV:11 BV:12 BV:13 BV:14 BV:15 BV:16 BV:17 19
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Start-Up and Maintenance Documentation Job Information Job Name Address City State Zip Phone Number Fax Number Contact Purchase Date Date Service Company Address City State Zip Phone Number Fax Number Contact Start-Up Date Service Performed NOTES: Factory Service Department Phone: 1-866-784-6900 Fax: 1-919-554-9374 20