Viconics VBZS Application Guide Manuel d'utilisateur

1 Viconics BACnet Zoning System Application Guide VZ7260X5x00B and VZ7656X5000B Controllers VBZS_Rel2_Application_Guide-E04 (R1 Issue Date: Ja

10configuration. • If the RTU is set to Control Type = Highest demand, the current action delivered by the RTU will be heating. • If the RTU

11allow the local heating and cooling demands to be sent to the RTU controller. This will have the effect of re-starting the central system and a

122C) Zone Set point Limits It cannot be stressed enough that must take caution and properly explain to the user or tenants of the building o

13o Zones selected to be masters for demand calculations should represent either: - Typical zones or areas that will be exposed to some of the

142E) Minimum, Maximum and Heat flow Adjustments Although system balancing can be accomplished by utilizing the controller’s built in configu

15- The selected zone dampers minimum position has a direct impact on the temperature stability for certain zones. Having a minimum position sel

16Please note: - 0 to 100 % is directly converted to 0 to 10 VDC on the VAV damper output. If the actuator has a positioning input range of 2 t

172 G) Passive Infra Red Motion Detector Cover (PIR) The Viconics zone controllers are compatible with the new Viconics PIR (Passive Infra Red

182 H) AI4 CO2 / Other Sensor Input Operation AI4 CO2 Sensor Input Operation The VT76XXE controller features a 0-10VDC input (AI4) that is u

192 I) Disable Minimum Position parameter The VZ7260 zone controllers feature the DisMinPo (Disable Minimum Position) parameter that is used

2Table of Contents: Please refer to the installation manuals of the zoning system controllers for all required information related to wiring, in

203) RTU Controllers VZ7656X1000B Operation The following information needs to be carefully read and properly understood if proper system com

213B) Occupancy and Overrides The occupancy of the zones is controlled by the schedule in the RTU controller. - When this schedule output v

223E) RTU Heating and Cooling Outdoor Air Temperature Lockouts H Lock and C Lock - Parameter C Lock temperature disables the cooling stages

23Also, the recorded RTU supply delta temperature and demand variances will always be higher when using a highest demand control type operation v

24Variable Frequency Drive Operation: In this case the G fan output is used as an enable / disable output for the VFD. The VFD should be confi

25 Economizer Control Mode Only If the fresh air damper is to be used only for free cooling purposes (economizer mode, without fresh air measu

26Economizer Mode and Fresh Air Measurement Station If the fresh air damper is to be used for both free cooling and minimum fresh air volume

27Economizer Mode and CO2 Level Control If the fresh air damper is to be used for both free cooling and CO2level control (economizer mode and

28Economizer Mode, CO2 Level Control and Fresh Air Measurement Station If the fresh air damper is to be used for both free cooling and CO2 le

294) BACnet Communication Overview The Viconics VZ7260X5x00B and VZ7656X1000B controllers use a local BACnet RS485 MS-TP communication bus be

31) System Overview and Architecture The Viconics Zoning System product is comprised of two controller types. • The VZ7260X5x00B Zoning co

304A) 3rd Party BACnet Integration BACnet being an open protocol also means that the Viconics zoning system products can be seamlessly integr

31EOL: MS-TP network must be properly terminated. For daisy chain configurations, you must install an EOL (End of Line) resistor at each end of t

324C) Communication Status LED and Troubleshooting Each controller has a communication status service LED for troubleshooting purposes. Monit

335B) Proper Commissioning RTU Controllers At the RTU level, care should be applied to insure the following: - Proper sizing of the RTU hea

34RTU Commissioning RTU mechanical cooling functional verification done Maximum Delta temperature ( return to supply temp ) for cooling stage #

35Zone Number ( ) Commissioning VAV damper actuator properly rigged and verified? ( opens & closes with demand ) Proper adjustments of

366B) Critical Point Checks To insure proper and reliable operation of the system, it is the responsibility of the system d

4• Proper wiring of all components as per the installation manual • Proper network wires pulled through all devices communication connections

5BACnet System Overview Viconics VZ72605x00B Zone controllers are used in conjunction with the VZ7656X1000B roof top controller controllers. Wh

61A) Initial Design Considerations The scope of this document is not intended to be a resource or white paper on VAV zoning syste

71C) Local Zone with Terminal Reheat or without Terminal Reheat Including or excluding use of terminal reheat is dictated by design criteria’s

81E) By-Pass Damper Design Rules A bypass damper is an airflow regulating device connected between the supply and return ducts. The bypass da

92A) Demand Based Heating and Cooling Systems System operation as a whole consists of selecting which zone controllers will have heating and