Viconics Wireles Zoning System Engineering Guide Specification
Viconics Wireless Zoning System Engineering Guide Spec 1.01 System Description – The Viconics Wireless Zoning System (VWZS) shall provide a simple and efficient demand based system for the operation of changeover bypass or pressure dependent type zoning systems utilizing standard 2 heat / 2 cool configurations, 2 heat / 2 cool with economizer and IAQ, analog heat/2 cool, or heat pump 3 heat/ 2cool.
VZ7656x1000W Wireless Rooftop or Heat Pump Controller The Rooftop unit Controller shall be: VZ7656R1000W: Up to two heating and two cool stages, single fan speed output, 0-10Vdc output for bypass damper or variable-frequency drive (VFD). VZ7656F1000W: Modulating 0-10Vdc heating / 2 cooling stages, single fan speed output, 0-10Vdc output for bypass damper or variable-frequency drive (VFD).
automatically revert to the internal temperature sensor. Control systems that cannot operate the packaged during a loss of communication with the zones are not acceptable. The VZ7656 controller shall be 7 day programmable with a choice of 2 or 4 events per day. Control systems that require an external time clock are not acceptable. The controller shall have an adjustable (from 0 to 5 minutes) minimum On/Off operation time of cooling & heating stages to prevent cycling.
Packaged unit controller model dependent specifications: VZ7656R1000W: Up to two heating and two cool stages, single fan speed output, 0-10Vdc output for bypass damper or variable-frequency drive (VFD). VZ7656F1000W: Modulating 0-10Vdc heating / 2 cooling stages, single fan speed output, 0-10Vdc output for bypass damper or variable-frequency drive (VFD).
Wireless Communicating Zone Controller VZ7260 Zone Controller – The zone controller shall be capable of controlling a local VAV analog damper actuator as well as a local duct furnace and on/off or PWM perimeter heater (if necessary). The zone controller shall also be capable of auto-changeover based on the central VZ7656 controller signal. The zone controller shall be capable of modulating the local VAV damper using integrated damper control logic.
The zone controller shall have a binary input that can be configured as follows: BI1 Binary input no.1 configuration (None): No function will be associated with the input. Point can still be monitored through the wireless network. Default: None (Motion NO): Used in Occupied Mode only to toggle from the Occupied set points to the Stand-By set points when no motion is detected for 60 minutes at the zone. As soon as motion is detected at the zone, the Occupied set points resumes.
Sequence of Operation – The Viconics Wireless Zoning System shall operate in the following manner: 1. The VZ7656x1000W Rooftop Unit controller shall determine the mode of operation (heating / cooling) by analyzing the PI heating and PI cooling demand sent by the weighted VZ7260x5x00W zone controllers. The RTU controller shall supply heating or cooling based on the resulting analysis (highest demand, average of three highest demands or average of five highest demands).
Sequence for economizer on VZ7656E1000Z only: The fresh air damper can be controlled through more than one sequence to achieve different control strategies such as free cooling (economizer mode), minimum fresh air control and CO2 level control. Note: For the sequences mentioned below, the following conditions must be met in order for the sequences to be performed as stated: - Max Pos parameter value must be greater than Min Pos Parameter value.
Economizer Mode and CO2 Level Control If the fresh air damper is to be used for both free cooling and CO 2level control (economizer mode and CO2 level control, but without fresh air measurement station), only the Min Pos, Max Pos, Min CO 2and Max CO2 parameters as well as the free cooling sequence will be active. - The FA Range parameter should be set to 0 CFM.
