Related Manuals for Viconics VZ7200F5x00W
Summary of Contents for Viconics VZ7200F5x00W
- Page 1 Viconics Zoning System Application Guide VZ7200F5x00W and VZ7656B1000W Thermostats Wireless_Zoning_System_Guide-E10 (028-6020 R1 Issue Date: July 13, 2010)
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Page 2: Table Of Contents
Please refer to the installation manuals of the zoning system thermostats for all required information related to wiring, installation, commissioning and integration: • For detailed information on the Viconics VZ72xx Zone thermostat, please refer and read the VZ72xx Product Guide. Installation and commissioning information is available on document: LIT-VZ7200W-Exx •... -
Page 3: System Overview And Architecture
Accurate temperature control is achieved due to the product’s PI proportional control algorithm, which virtually eliminates temperature offset associated with traditional, differential-based thermostats. The Zone thermostats are also compatible with the new Viconics PIR cover accessories. Thermostat is equipped with a PIR cover which provides advanced active occupancy logic. The system will automatically switch occupancy levels from occupied to stand-by and unoccupied as required when activity is detected or not detected by the unit. - Page 4 The following documents are available at: www.viconics.com • For detailed information on the Viconics VZ72xx zone thermostat, please refer and read the VZ72xx Product Guide. Installation and commissioning information is available on document: LIT-VZ7200_W-Exx • For detailed information on the Viconics VZ76xx RTU thermostat, please refer and read the VZ76xx Product Guide. Installation and commissioning information is available on document: LIT-VZ7656_W-Exx •...
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Page 5: Initial Design Criteria Considerations
1A) Initial Design Criteria Considerations The scope of this document is not intended to be a resource or white paper on VAV zoning system design. There are many good resources available on the subject of VAV zoning systems and their associated advantages and disadvantages. - Page 6 Each VZ76xx RTU thermostat and its associated VZ72xx zone thermostats will use the same PAN ID and channel as the Viconics VWG and Jace-driver. The range of PAN ID on all thermostats to use is 1 to 250. This range is reserved for the networked system (NS) operation.
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Page 7: By-Pass Damper Design Rules
Contrary to low end commercial and residential zoning thermostats which use a two positions open-close actuator, Viconics VZ7200F5x00X uses proportional analog 0 to 10 Vdc modulating damper actuator. This enables performances and control sequences to be much closer to what is normally found in DDC application specific control devices. -
Page 8: Demand Based Heating And Cooling Systems
2A) Demand Based Heating and Cooling System System operation as a whole consists of selecting which zone thermostats will have heating and cooling weighted votes used by the RTU thermostat to which they are attached. The weighted heating and cooling demand values from the selected master zones are then used by the RTU thermostat to determine if heating or cooling action is required for the system as a whole. - Page 9 Example 2 with 3 voting master zones only Voting Zone 1 Voting Zone 2 Voting Zone 3 RTU Control Type Current heat Current heat Current heat Highest Average of 3 demand demand demand highest 100% Heat weight set Heat weight set Heat weight set 100% 100%...
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Page 10: Overrides And User Zone Interface Lockouts
2B) Overrides and User Zone Interface Lockouts Each zone thermostat can have a function locked out for the local user. This can prevent unwanted inputs to the system as a whole when the zone thermostats are installed in public areas or when certain local user interface functions of the zone thermostats are to be prevented. -
Page 11: Heating And Cooling Weight Zone Selection
2D) Heating and Cooling Weight Zone Selection For any system to properly operate, care must be taken to select which zones will be driving the system and their weight attached to the calculations. The values below are provided as an initial rule of thumb and need to be re-evaluated on a job per job basis depending on the specifics of the system design and layout. -
Page 12: Minimum, Maximum And Maxheatflow Adjustments
External zones considered of primary importance should have both their heating and cooling weight set to 100% Zones considered of secondary importance can have their weight set to a lesser value than 100% to reflect their importance on the systems total voting when making demand calculations. Due to, their location, exposure, design, etc……, certain zones can have problematic behaviour specifically in peak heating or cooling mode. - Page 13 Maximum Heatflow Adjustment (MaxHTPos) Many installers will assume that this parameter sets the Maximum airflow of the VAV damper when the RTU is delivering hot air. This is not the case. Both the maximum amount of cold AND hot air delivered to the zone is set by the (Max Pos) zone damper parameter.
- Page 14 How To Test and Balance the Minimum, Maximum and Heat Flow Values: Balancing Minimum Air Flow 1. Be sure local system heating is allowed by setting the outdoor heating lockout value at the RTU thermostat (H Lock) 2. Be sure the system is currently in heating mode. As viewed locally at the RTU thermostat by pressing the manual scroll button and displaying the local Zone Sequence = Heat message prompt.
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Page 15: Terminal Reheat Lockout
AO2 OALK 2G) Passive Infra Red Motion Detector Cover (PIR) The Viconics zone thermostats are compatible with the new Viconics PIR (Passive Infra Red) cover accessory. Thermostats equipped with a PIR cover provide advanced active occupancy logic, which can automatically switch occupancy levels from occupied to stand-by as required when local activity is detected in the room. -
Page 16: Rtu Thermostats Vz7656B1000W Operation
Unlike low end commercial or residential zoning thermostats which typically only use two position demand or non- demand logic to initialize heating and cooling functions, Viconics VZ7656B1000X uses local PI zone demand(s) to operate heating and cooling stages. Accurate temperature control in the zones is achieved by the time proportional control algorithm. -
Page 17: Occupancy And Overrides
Many configuration and normal operation factors can limit action to the heating and cooling stages. Some example of this would be: Heating or cooling lockout based on outdoor air temperature ( configuration ) Heating or cooling lockout based on supply air temperature ( configuration ) Heating or cooling lockout based on anti-cycling ( configuration or RTU control card ) Fixed 2 minutes delay when RTU toggles from heating to cooling and vice-versa ( operation ) The RTU thermostat will then forward data to the zone thermostats:... -
Page 18: Rtu Heating And Cooling Supply Air Temperature Lockouts
3D) RTU Heating and Cooling Supply Air Temperature Lockouts One problematic aspect of any VAV zoning system is high demand for (heating or cooling) when most of the zone VAV dampers are closed. This leads to most of the supply air being re-circulated through the pressure by-pass and can lead to extremely hot or cold supply temperature. -
Page 19: Critical Mid-Season Changeover
3F) Critical Mid-Season Changeover Heating and cooling RTU equipment cycling during mid-seasons is inevitable with a zoning VAV system if any degree of comfort is to be maintained. A properly setup system will be able to deliver comfort to conflicting zone demands during the mid-season period by alternating heating and cooling at the RTU. - Page 20 65,000 nodes per network. All the properties of the physical layer are used and employed by the Viconics mesh network but are hidden to the user for ease of configuration and commissioning of the network database.
- Page 21 4A) (SA) Stand-Alone applications When PAN ID is used with a range of 251 to 500, for (SA) Stand-Alone Systems. In this application, the VZ76xx thermostat(s) act as the coordinators to their own system. I.E. they are the network masters for each VZ72xx thermostat reporting to them when the whole zoning system(s) is self sufficient and communication and no external communication is required.
- Page 22 The VWG and Jace-driver are the network masters for any thermostat(s) reporting to them, where zoning system(s) are required to communicate and exchange data points with the Viconics VWG and Jace-driver set. (More than one can be installed in a typical building application). ·...
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Page 23: Basic Initial Design And Deployment Consideration
4C) Basic Initial Design and Deployment Considerations Proper design considerations need to be addressed prior to the installation of a Viconics wireless zoning system. 1. To avoid network interference with 802.11 Wi-Fi devices in the 2.4GHz spectrum range, Viconics recommends the use of 802.15.4 channels 15, 25 and 26 only. 802.11 Wi-Fi transmissions overlap and may interfere with other channel selections allowed by 802.15.4 (Channels 11 to 14 &... - Page 24 3. Ensure that the minimum distance between any Viconics node and any Wi-Fi devices (wireless routers, wireless adapters, lap-tops using wireless networks, etc….) to be at least 3 feet (1 M) and preferably 10 feet (3 M) or more. Minimum 3 feet (1 M)
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Page 25: Communication Status Led And Troubleshooting
4D) Communication status LED and Troubleshooting Each thermostat has a communication status service LED for troubleshooting purposes. Monitoring this LED will determine the network condition for each individual device and will tell you if they are successfully communicating with their peers on the network. VZ76xx Adapter LED Status Indicators (SA) Stand-Alone applications. -
Page 26: System Commissioning
VZ72 Adapter LED Status Indicators Power on 1 x 200ms short blink Power on 2 x 200ms short blinks Communicating with thermostat base Power on 3 x 200ms short blinks Communicating with thermostat There is connectivity to wireless network Power on 4 x 200ms short blinks Communicating with thermostat There is connectivity to wireless network... -
Page 27: Proper Commissioning Rtu Thermostats
5B) Proper Commissioning RTU Thermostats At the RTU level , care should be applied to insure the following conditions are met: Proper sizing of the RTU heating and cooling capacity to insure it will meet the highest instantaneous peak loads of the areas deserved by the system. Proper strategy and system layout of the mechanical system architecture. - Page 28 RTU Commissioning RTU mechanical cooling functional verification done Maximum Delta temperature ( return to supply temp ) for cooling stage #1: Maximum Delta temperature ( return to supply temp ) for cooling stage #1 & 2: Economizer cooling functional verification done Minimum position of economizer properly set? RTU thermostat Aux output used to disable minimum position of economizer check ? RTU heating functional verification done...
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Page 29: Single 24 Vac Zone Transformer Vs. Multi 24 Vac Zone Transformers
Zone Number ( ) Commissioning VAV damper actuator properly rigged and verified? ( opens and closes with demand ) Proper adjustments of zone side take off balancing damper? Proper balancing of zone minimum position? CFM = Proper balancing of zone maximum position? CFM = Proper balancing of zone MaxHeatflow position? (If reheat is used) CFM =... -
Page 30: Critical Point Checks
6B) Critical Point Checks To insure proper and reliable operation of the system, it is the responsibility of the system designer or installer to properly verify all important milestones of the project . This includes all other contractual aspects for the system performed outside of the control system scope of work: Design phase: load calculations and ductwork layout and sizing, equipment selection, etc…..