BACnet PTEC Controller Dual Duct 2 AVS - VAV Changeover, Application 6669 Application Note 140-1117 2017-06-23 Building Technologies
Table of Contents Overview ............................................................................................................................. 5 BACnet .............................................................................................................................. 7 Hardware Inputs .................................................................................................................. 7 Room Unit Identification ...............................................................
Wiring Diagrams ................................................................................................................ 22 Application 6669 Point Database ................................................................................... 26 4 Siemens Industry, Inc.
Overview BACnet Overview NOTE: For information on applications with Firmware Revision Bx40 or earlier, see InfoLink and/or Asset Portal for documentation. In Application 6669, in cooling mode, the controller provides independent control of the hot duct and the cold duct inlet dampers to provide variable air volume control to modulate the cold duct damper to maintain the room temperature setpoint and the hot duct damper to ensure minimum flow.
Overview BACnet Application 6669 Control Schedule. NOTES: 1. See Control Temperature Setpoints. 2. See Heating/Cooling Switchover. 3. The reheat can be a modulating valve or time modulated electric reheat. See Optional Auxiliary Heat. 4. The reheat can be sequenced to operate either in series or in parallel with the hot duct damper. It is shown in series. See Sequencing Logic. 5. The hot duct can be operated as a secondary cooling duct. See Cooling Operation. 6.
Overview BACnet BACnet The controller communicates using BACnet MS/TP protocol for open communications on BACnet MS/TP networks.
Overview Hardware Outputs Room Unit Identification For Analog Room Units (Series 1000) – The revision number is visually identified by its case. For Digital Room Units (Series 200/2300 Firmware Revision 25 or earlier) – The revision number displays for 5 seconds when the room unit is first powered up. These room units will display laptop when a laptop is connected and will no longer update room temperature sensor values.
Sequence of Operation Control Temperature Setpoints Sequence of Operation The following paragraphs present the sequence of operation for Application 6669 -Variable Air Volume with Changeover. Control Temperature Setpoints This application has a number of different room temperature setpoints (DAY HTG STPT, NGT CLG STPT, RM STPT DIAL, and so on.). The application actually controls using the CTL STPT.
Sequence of Operation Control Temperature Setpoints CTL STPT Using Standard/Absolute Mode (Digital Room Unit, Revision 26 and later) Digital Room Unit (2200/2300 Series Firmware Revision 26 and later) For all new digital room units, the value displayed and reported by the room unit is linked to the current heat/cool mode. When the mode changes, the value is automatically updated based on the new heat/cool mode.
Sequence of Operation Control Temperature Setpoints CTL STPT Using Standard/Absolute Mode (Analog or Digital Room Unit) Analog (Series 1000) or Digital Room Units (Firmware Revision 25 or earlier) NOTE: 2200/2300 digital room units with Firmware Revision 25 or earlier are only compatible with standard room unit functionality (no warmer/cooler). When STPT SPAN is set to 0, CLT STPT is set based on the value of the setpoint dial and the setpoint deadband.
Sequence of Operation Heating/Cooling Switchover CTL STPT Using Warmer/Cooler Mode (Analog Room Unit Only) Analog Room Unit (Series 1000) NOTE: The warmer-cooler function for analog room units (Series 1000) use the warmer/cooler scale of units with a warmer/cooler housing.
Sequence of Operation Heating/Cooling Switchover Switchover From a Duct Temperature Sensor Reading – Determines whether or not the hot duct is performing as a secondary cold duct in Cooling mode by monitoring a duct temperature sensor reading. When the value of HTGDUCT TEMP < CLG TEMP, HOT.COLD is set to COLD. This informs the controller that the hot duct is operating as a secondary cold duct. HEAT.COOL is set to COOL as long as HOT.COLD is set equal to COLD. When HTGDUCT TEMP > HTG TEMP, HOT.
Sequence of Operation Heating/Cooling Switchover Heating/Cooling Switchover Using Warmer/Cooler Mode (Digital Room Unit, Revision 26 and later) Digital Room Unit (2200/2300 Series Firmware Revision 26 and later) For new digital room units, the graphic or actual value displayed and reported by the room unit is linked to the current heat/cool mode. When the mode changes, the value is automatically updated based on the new heat/cool mode.
Sequence of Operation Room Temperature, Room Temperature Offset and CTL TEMP Heating/Cooling Switchover Using Warmer/Cooler Mode (Analog Room Unit) Analog Room Unit (Series 1000) The RM STPT DIAL displays the current temperature setpoint based on a plus or minus position or increment that you enter at the room unit. The amount of offset that can be entered with the analog room unit is limited to a value of minus STPT SPAN to plus STPT SPAN.
Sequence of Operation Ventilation Demand Minimum Ventilation Demand Minimum The additional flow setpoint (VENT DMD MIN) is provided to allow setting and adjustment of the ventilation air required during occupied modes. VENT DMD MIN flow setpoint is used in conjunction with the existing cooling and heating flow minimum setpoints but only during the occupied modes. VENT DMD MIN can be set above, equal to, or below CLG FLOW MIN or HTG FLOW MIN setpoints and the controlling minimum is the greater of the two.
Sequence of Operation Cooling Operation Cooling Operation In normal cooling mode (when HOT.COLD = HOT, both hot and cold air available), the output of CLG LOOPOUT is used to determine the setpoint for CLG FLO STPT. This flow loop maintains the space temperature. The cooling flow loop limits the airflow supplied by the cold duct to the value of CLG FLOW MAX. In day mode, the minimum airflow from the cold duct will be CLG FLOW MIN. In night mode, the minimum airflow from the cold duct will be 0 cfm.
Sequence of Operation Optional Auxiliary Heat Optional Auxiliary Heat If AUX HTG USED = YES, this application also controls auxiliary heat. The value of AUX HTG TYPE indicates the type of auxiliary heat control. If AUX HTG USED = NO, no auxiliary heat is used. CAUTION If using electric heat, verify that the equipment is supplied with safeties by others to ensure that there is airflow across the heating coils when they are to be energized or equipment damage may result. Do not set TOT FLOW MIN to zero.
Sequence of Operation Calibration Calibration Calibration of the controller’s internal air velocity sensor(s) is periodically required to maintain accurate air velocity readings. CAL SETUP is set with the desired calibration option during controller startup. Depending on the value of CAL SETUP, calibration may be set to take place automatically or manually. If CAL AIR = YES, calibration is in progress. Calibration of the valve is not affected by the presence of Autozero Modules.
Sequence of Operation Auto Discovery Thermistor Inputs Default for input is 10K. To enable 100K Ω thermistor on input, see the following table for additive values.
Sequence of Operation PPCL STATUS PPCL STATUS PPCL STATUS displays LOADED or EMPTY. LOADED = PPCL - programming is present in the controller. A new application number must be assigned (12000 through 12999). EMPTY = NO PPCL - programming is present. The maximum number of PPCL dynamic points is 15.
Sequence of Operation Wiring Diagrams Wiring Diagrams NOTE: The controller’s DOs control 24 Vac loads only. The maximum rating is 12 VA for each DO.
Sequence of Operation Wiring Diagrams NOTE: When wiring any actuator that uses a 0 to 10V control signal and ties AC neutral to DC common, an additional wire must connect the actuator AC neutral to the DC common of the PTEC/TEC AO being used to control the actuator. 24 Vac Modulating Control.
Sequence of Operation Wiring Diagrams Application 6669 – Variable Air Volume with Changeover with Hot Water Reheat. 24 Siemens Industry, Inc.
Sequence of Operation Wiring Diagrams Application 6669 – Variable Air Volume with Changeover with Electric Auxiliary Reheat. 25 Siemens Industry, Inc.
Application 6669 Point Database Application 6669 Point Database Object Type a) Object Instance (Point Number) Object Name (Descriptor) Factory Default (SI Units) b) Eng Units (SI Units) Range Active Text Inactive Text AO 1 CTLR ADDRESS 255 -- 0-255 -- -- AO 2 APPLICATION 6693 -- 0-32767 -- -- BO {03} HOT.COLD COLD -- Binary HOT COLD AI {04} ROOM TEMP 74.0 (23.44888) DEG F (DEG C) 48-111.75 -- -- BO {05} HEAT.
Application 6669 Point Database Object Type a) Object Instance (Point Number) Object Name (Descriptor) Factory Default (SI Units) b) Eng Units (SI Units) Range Active Text Inactive Text AO 28 HTGFLO DGAIN 0 -- 0-510 -- -- BO {29} DAY.NGT DAY -- Binary NIGHT DAY AI {30} HTG VOLUME 0 (0.0) CFM ( LPS) 0-131068 -- -- AO {32} CLG FLOW MAX 2200 (1038.18) CFM ( LPS) 0-131068 -- -- AO {33} TOT FLOW MIN 220 (103.
Application 6669 Point Database Object Type a) Object Instance (Point Number) Object Name (Descriptor) Factory Default (SI Units) b) Eng Units (SI Units) Range Active Text Inactive Text AO 63 CLG P GAIN 20.0 (36.0) -- 0-63.75 -- -- AO 64 CLG I GAIN 0.012 (0.0216) -- 0-1.023 -- -- AO 65 CLG D GAIN 0 (0.0) -- 0-510 -- -- AO 66 CLG BIAS 50 PCT 0-102 -- -- AO 67 HTG P GAIN 10.0 (18.0) -- 0-63.75 -- -- AO 68 HTG I GAIN 0.012 (0.0216) -- 0-1.
Application 6669 Point Database Object Type a) Object Instance (Point Number) Object Name (Descriptor) Factory Default (SI Units) b) Eng Units (SI Units) Range Active Text Inactive Text AO 97 CLGDUCT AREA 1.0 (0.09292) SQ. FT (SQ M) 0-6.375 -- -- AO 98 LOOP TIME 5 SEC 0-255 -- -- AO {99} ERROR STATUS 0 -- 0-255 -- -- AO {102} AOV 1 0 VOLTS 0-10.23 -- -- AO {103} AOV 2 0 VOLTS 0-10.23 -- -- AO {104} AOV 3 0 VOLTS 0-10.
Issued by Siemens Industry, Inc. Building Technologies Division 1000 Deerfield Pkwy Buffalo Grove IL 60089 Tel. +1 847-215-1000 Document ID 140-1117 Edition 2017-06-23 © Siemens Industry, Inc., 2017 Technical specifications and availability subject to change without notice.
