PIR Ready VT72xx & VT(R) 73xx Series 24 Vac Fan Coil and Zoning Thermostats For Commercial and Lodging HVAC Applications BACnet Integration Manual ITG-VT(R) 72_73-BAC-E11 (028-6009 R11 Issue Date: February 7th, 2012) 1
VT7200X Series Product Overview The VT7200 PI thermostat family is specifically designed for zoning applications. Typical applications include local hydronic reheat valve control and pressure dependent VAV with or without local reheat. The product features a backlit LCD display with dedicated function menu keys for simple operation.
Contents Subject VT72_73 series Protocol Implementation Conformance Statements (PICS) o Objects Table Standard Object Types Supported List of Proprietary Properties List of Property Value Range Restrictions List of Property Enumeration Set for BV Objects and BI Objects List of Property Enumeration Set for MV Objects Integration - Global commands Integration - Graphic User Interface (GUI) Objects Integration - Configuration objects Wiring Guide o Overview o Network Configuration o Maximum
VT72_73 series Protocol Implementation Conformance Statement (PICS) Vendor Name: Viconics Product Name: VT7200 and VT7300 Thermostat Series VT7200 Product Description: The VT7200 series BACnet communicating thermostat have been specifically designed for zoning applications to be monitored on a BACnet MS-TP® network.
Objects Table Object Name VT7200X5x00B VT73xxX5X00B Type and Instance Device Object Property Object_Identifier Property 75 (R,W) Object_Name Property 77 (R,W) Model Name Property 70 (R) Firmware Revision Property 44 (R) Protocol Version Property 98 (R) Protocol Revision Property 139 (R) Max ADPU Length Property 62 (R) ADPU Timeout Property 10 (R) ApplicationSoftware-Version Property 12 (R) Max_Master (R,W) MS/TP_Address Property 1001 (R,W) MS/TP_Baud_Rate Property 1002 (R,W) Thermostat Parameter Unique I
VT7200C5x00B VT7200F5x00B VT7300A5x00B VT7305A5x00B VT7300C5x00B VT7305C5x00B VT7350C5x00B VT7355C5x00B VT7300F5x00B VT7305F5x00B VT7350F5x00B VT7355F5x00B VT7300F5x00B-2572 VT7200 & VT7300 SERIES Room Temperature AV 7 Present_Value (R,W) Room Temp Override Outdoor Temperature BV 8 AV 9 Present_Value (R,W) Present_Value (R,W) Room Humidity AV 10 Present_Value (R,W) A02 E
VT7200C5x00B VT7200F5x00B VT7300A5x00B VT7305A5x00B VT7300C5x00B VT7305C5x00B VT7350C5x00B VT7355C5x00B VT7300F5x00B VT7305F5x00B VT7350F5x00B VT7355F5x00B VT7300F5x00B-2572 Temperature Setpoints GRP 38 Present_Value (R) Occupied Heat Setpoint AV 39 Present_Value (R,W) Occupied Cool Setpoint AV 40 Present_Value (R,W) Stand-by Heat Setpoint AV 41 Present_Value (R,W)
VT7355F5x00B BV 70 Present_Value (R,W) RH Setpoint AV 71 Present_Value (R,W) Dehumidification Hysterisys AV 72 Present_Value (R,W) Dehumidification MAX Cooling AV 73 Present_Value (R,W) Output Configuration Options GRP 74 Present_Value (R) Control type BV 75 Present_Value (R,W) Floating Motor timing MV 76 On Off Control CPH Direct Reverse Acting Present_Value (R,W) MV 77 Present_Value (R,W)
VTR7300A5x00B VTR7305A5x00B VTR7350A5x00B VTR7355A5x00B MV 19 PV (R,W) GRP 20 PV (R) PI Heating Demand AV 21 PV (R) PI Cooling Demand AV 22 PV (R) Dehumidification Status BI 23 PV (R) GRP 24 PV (R) Fan Status MV 28 PV (R) BI 1 Status BI 29 PV (R) BI 2 Status BI 30 PV (R) Local Motion BI 32 PV (R) Effective Occupancy MV 33 PV
VTR7300A5x00B VTR7305A5x00B VTR7350A5x00B VTR7355A5x00B Cooling Setpoint Limit AV 59 PV (R,W) Setpoint Type BV 60 PV (R,W) Setpoint Function BV 61 PV (R,W) Temporary Occupancy Time MV 62 PV (R,W) Deadband AV 63 PV (R,W) Proportional Band MV 65 PV (R,W) Auto Fan BV 66 PV (R,W) Stand-by Time AV 67 PV (R,W) Unoccupied Time Humidity Models Config Options AV
Standard Object Types Supported Object Type Supported Objects Dynamically Creatable Dynamically Deletable Optional Properties Supported Writable Properties Reliability Out_of_Service Reliability Present_Value a Out_of_Service c Object_Name Analog Input a,b Analog Value Binary Input Binary Value Device Max_Master Max_Info_frames Object_Identifier Object_name Max_Master Group N/A N/A Multi-state Value Reliability States_Text
List of Property Value Range Restrictions Object name Room Temperature Outdoor Temperature Room Humidity A02 ECM Value Supply Temperature PI Heating demand PI Cooling demand Occupied Heat Setpoint Occupied Cool Setpoint Stand-by Heat Setpoint Stand-by Cool Setpoint Unoccupied Heat Setpoint Unoccupied Cool Setpoint RH Setpoint Dehumidification Hysterisys Dehumidification MAX cooling Password Value Heating Setpoint Limit Cooling Setpoint Limit Deadband Stand-by Time Unoccupied Time RH Setpoint Dehumidificatio
RH Display Control Type Direct/ Reverse Acting BV 70 BV 75 BV 78 Heat NO NC BV 86 Cool NO NC BV 87 RUI 1 Status RBI 2 Status Cooling Valve Status Heating Valve Status BI 91 BI 92 BI 93 BI 94 Disabled On/Off Direct Acting Normally Opened Normally Opened Deactivated Deactivated Off Off Enabled Floating Reverse Acting Normally Closed Normally Closed Activated Activated On On Disabled On/Off Direst Acting Normally Closed Normally Closed Deactivated Deactivated Off Off (*) This object will be linked t
List of Property Enumeration Sets for MV Objects Object Name Object ID Sequence of Operation MV 15 System Mode Note 1 MV 16 Fan Mode Note 3 MV 17 Occupancy Command MV 18 Keypad Lockout MV 19 BACnet Index Text 1 2 3 4 5 6 1 2 3 4 Cooling Only Heating Only Cooling & Reheat Heating & Reheat Cool/Heat4P Cool/Heat4P&Reht Off Auto Cool Heat 1, 2, 3 or 4 Note 4 1 2 3 1 2 3 4 5 6 Local Occupancy Occupied Unoccupied Level 0 Level 1 Level 2 Level 3 Level 4 Level 5 Default value Heating Only Note
Object Name Object ID BACnet Index Output 2 Note 6 MV 26 Note 7 Note 7 Note 7 Output 1 Note 8 MV 27 Note 9 Note 9 Note 9 1 2 3 4 1 2 3 4 Off Low Med High Occupied Unoccupied Temporary Occupied Stand-by Fan Status MV 28 Effective Occupancy MV 33 Text Default value Off Depends on local occupancy Note 6 Enumeration sets for MV26 depends on Control Type (BV75) value and Pipe Number (MV52) value upon device discovery.
Object Name Object ID BI1 Configuration MV 46 BI2 Configuration MV 47 UI3 Configuration MV 48 Pipe Number MV 52 Out#1 Cfg MV 53 AUX Configuration MV 54 Fan Mode Sequence MV 57 BACnet Index Text 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 1 2 1 2 3 4 5 6 1 2 3 4 5 None Rem NSB Motion NO Motion NC Window None Door Dry Override Filter Service None COC/NH COC/NC COS SS 2 Pipe 4 Pipe 2 4 Not used NO with Occ NC with Occ NO with Occ & Fan NC with Occ & Fan Network controlled Low-Med-High Low-High Low-Med
Object Name Temporary Occupancy Time Proportional Band Object ID MV 62 MV 65 BACnet Index Text Default value 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1 2 3 4 5 6 7 3 4 5 6 7 8 9 0 hour 1 hour 2 hours 3 hours 4 hours 5 hours 6 hours 7 hours 8 hours 9 hours 10 hours 11 hours 12 hours 13 hours 14 hours 15 hours 16 hours 17 hours 18 hours 19 hours 20 hours 21 hours 22 hours 23 hours 24 hours 3F 4F 5F 6F 7F 8F 9F 1.2 C 1.7 C 2.2 C 2.8 C 3.3 C 3.9 C 5.0 C 8 10 10 F 5.
Object Name Object ID Floating Motor Timing MV 76 On-Off Control CPH MV 77 RUI 1 Configuration MV 82 RBI 2 Configuration MV 83 BACnet Index Text 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 2 3 4 5 6 0 1 2 3 4 5 0 1 2 0.5 minute 1 minute 1.5 minutes 2 minutes 2.5 minutes 3 minutes 3.5 minutes 4 minutes 4.5 minutes 5 minutes 5.5 minutes 6 minutes 6.5 minutes 7 minutes 7.5 minutes 8 minutes 8.
Object Name Object ID Heat CPH MV 84 Cool CPH MV 85 Pulsed Heat MV 90 Fan Control MV 95 BACnet Index 3 4 5 6 7 8 3 4 5 6 7 8 0 1 2 0 1 2 Text 3 CPH 4 CPH 5 CPH 6CPH 7CPH 8 CPH 3 CPH 4 CPH 5 CPH 6CPH 7CPH 8 CPH Off On Occupancy Output On Off-Auto Off-All Default value 4 CPH 4 CPH Off On 19
Integration – Global Commands The following figure shows which objects from the thermostat can be monitored and commanded from the BAS front-end.
VT7200X Integration – Graphic User Interface (GUI) objects The following objects should be typically used in a GUI: Room Temperature (AV7); Occupied and Unoccupied Heat Setpoints (AV 39 and AV43); Occupied and Unoccupied Cool Setpoints (AV 40 and AV34); Outdoor Temperature (AV 9); Supply Temperature (AI12) (If available); Occupancy Command (MV18); System Mode (MV16); Output 2 (MV26); Output 1 (MV28); PI Heating Demand (AV21) PI Cooling Demand (AV22) Window Alarm (BI 35); Filter
VT73xxX Integration – Graphical User Interface (GUI) Objects The following objects should be typically used in a GUI: Room Temperature (AV7); Occupied and Unoccupied Heat Setpoints (AV 39 and AV43); Occupied and Unoccupied Cool Setpoints (AV 40 and AV34); Room Humidity (AV10) (If available); Room Humidity Setpoint (AV 71) (If available); Outdoor Temperature (AV 9); Supply Temperature (AI12) (If available); Occupancy Command (MV18); System Mode (MV16); Fan Mode (MV17); Fa
Configuration Objects The following objects and group objects should be typically used for configuration purposes: General Options 1 Group GRP 45 and its complete list of objects; General Options 2 Group GRP 55 and its complete list of objects; Humidity Models Config Options Group GRP 69 and its complete list of objects; Output Configuration Options Group GRP 74 and its complete list of objects.
Cable Type Viconics recommends the use of balanced 22-24 AWG twisted pair with characteristic impedance of 100130 ohms, capacitance of 30 pF/ft or lower. A braided shield is also recommended. Impedance A value based on the inherent conductance, resistance, capacitance and inductance that represent the impedance of an infinitely long cable. The nominal impedance of the cable should be between 100Ωand 120Ω. However using120Ω will result in a lighter load on the network.
Maximum Number of Devices A maximum of 64 nodes is allowed on a single daisy chain segment. A node is defined as any device (Panel, Zone, Repeater, etc) connected to the RS485 network. Terminators do not count as a node. To determine the number of nodes on a network, add the following: One node for each device, including main panels One node for each repeater on the chain For the example in Figure 4, we have one node for the main Panel, plus 4 for the controllers, for a total of 5 nodes.
Figure 5: Correct usage – repeaters are daisy chained to the supervisory controller and separate daisy chains branch from each repeater. Do not install repeaters in series, as this may result in network reliability problems. Figure 6 demonstrates an incorrect use of a repeater in an EIA-485 network.
End Of Line (EOL) Resistors MS/TP network must be properly terminated. For daisy chain configurations, you must install an EOL resistor at each end of the daisy chain. Depending on your MSTP network configuration, the resistance value of the EOL resistor may change: Viconics’ devices are installed at both ends of the MSTP network: 120 Ohms resistor should be installed at each end.
Table 2 shows the different possibilities with the Status LED behaviour for a BACnet module.
Integrating Viconics’ Devices on an MSTP Network Before doing any BACnet integration, make sure to have Viconics’ PICS (Protocol Implementation Conformance Statement). This PICS document lists all the BACnet Services and Object types supported by a device and can be found at www.viconics.com. Viconics’ devices do not support the COV service. COV reporting allows an object to send out notices when its Present-Value property is incremented by a pre-defined value.
Tips and Things You Need To Know Each thermostat is delivered from the factory with the default MAC address set at 254. At this value, the BACnet communication is NOT active and the device will not participate in the token pass either. The local LED status for the communication adapter at this point is one short flash only. To enable the BACnet communication, set the local MAC address configuration property of the thermostat to any valid value from 0 to 127.
Troubleshooting Section Error / Trouble Condition Thermostat does not come online Possible Cause Solution Two or more controllers have the same MAC address. The MS/TP network has too many devices. Too many devices were installed without any repeaters. The MS/TP cable runs are broken Modify each duplicate address to a unique number. Do not exceed the maximum number of devices and maximum length allowed by the EIA-485 specifications. Repeaters need to be installed as specified in this document.
