CVB4022AS-VAV1
Details
Details
Product Information
General
The CVB4022AS-VAV1 and CVB4024NS-VAV1 controllers are part of the Stryker family. The controllers are BACnet MS/TP network devices designed to control HVAC equipment. These controllers provide many options and advanced system features that allow state-of-the-art commercial building control. Each controller is configurable using the NIAGARA FRAMEWORK® software.
The controllers are for use in VAV (Variable Air Volume) control applications. Each controller provides flexible universal inputs for external sensors, digital inputs, and a combination of analog outputs and digital outputs.
Features
- Uses the BACnet MS/TP network protocol.
- EIA-485 communication network capable of baud rates between 9.6 and 115.2 kbits/s.
- Capable of stand-alone operation but can also use BACnet network communications.
- Sylk™ bus for use with Sylk-enabled sensors.
- Supports up to 30 controllers per BACnet MS/TP segment.
- Field configurable for control, input, and output functions using the NIAGARA FRAMEWORK® software.
- Built-in Zone Control functions include a remote wall module interface and a scheduler.
- Pressure-independent or pressure-dependent single Variable Air Volume (VAV) control.
- Microbridge air flow sensor with dual integral restrictor design.
- Easy user access to air flow sensor inputs.
- Actuator (CVB4022AS-VAV1 only) mounts directly onto the VAV box damper shaft and has up to 44 lb-in (5 Nm) torque, 90-degree stroke, and 90-second timing at 60 Hz.
- All wiring connections are made to removable terminal blocks to simplify controller installation and replacement.
- Both controller housing and actuator are UL plenum rated.
Specifications
Description
The configurable VAV/Unitary controllers are available as described in Table 1.
Table 1. Controller Configurations
| Controller Model | Programmable Type | Universal Inputs (UI) | Digital Inputs (DI) | Analog Outputs (AO) | Digital Outputs (DO) | Velocity Pressure Sensor | Series 60 Floating Actuator |
|---|---|---|---|---|---|---|---|
| CVB4022AS-VAV1 | VAV | 4 | 0 | 2 | 2 | YES | YES |
| CVB4024NS-VAV1 | VAV | 4 | 0 | 2 | 4 | YES | NO |
VAV Equipment Control
VAV controllers provide pressure-independent air flow control and pressure-dependent damper control. VAV systems generally provide cool air only to zones.
Each controller also includes programmable inputs and outputs that can control additional devices such as fans or VAV box reheat coils. Heaters can be staged electric or modulating hot water. Supply and exhaust pressurization control is provided on a zone basis.
Specifications
Electrical
- Rated Voltage: 20–30 Vac; 50/60 Hz
- Power Consumption:
- 100 VA for controller and connected loads (including actuator on CVB4022AS-VAV1)
- Controller only load: 5 VA max (CVB4024NS-VAV1)
- Controller + actuator load: 9 VA max (CVB4022AS-VAV1)
- External Sensors Power Output: 20 Vdc ±10% @ 75 mA max
Environmental
- Operating Temperature: 32°F to 122°F (0°C to 50°C)
Dimensions
See Fig. 1 and Fig. 2 on page 6 for drawings.
Approval Bodies
- UL/cUL listed under UL916
- CSA listed
- FCC Part 15 Class B compliant
- Canadian standard C108.8 compliant
Real Time Clock
- 24-hour, 365-day calendar
- Automatic daylight savings adjustment
- Backup: 24 hours (32–100°F)
- Accuracy: ±1 minute per month at 77°F
Velocity Pressure Sensor
- Operating Range: 0 to 1.5 in. H2O (0 to 374 Pa)
Series 60 Floating Actuator
- Rotation Stroke: 95° ±3°
- Torque Rating: 44 lb-in (5 Nm)
- Run Time: 90 seconds for 90° rotation
Inputs and Outputs
Each controller includes a combination of universal inputs (UI), digital inputs (DI), analog outputs (AO), and digital outputs (DO).
Digital Input (DI) Circuits
- Voltage Rating: 0–30 Vdc
- Input Type: Dry contact
- Operating Range: Open = False, Closed = True
- Resistance: Open >3000Ω, Closed <500Ω
Digital Triac Output (DO) Circuits
- Voltage Rating: 20–30 Vac
- Current Rating: 25–500 mA continuous
- 800 mA for 60 ms
Analog Output (AO) Circuits
Outputs configurable for current or voltage.
Analog Current
- Range: 4–20 mA
- Max Load: 550Ω
Analog Voltage
- Range: 0–10 Vdc
- Max Current: 10 mA
Hardware
CPU
32-bit ATMEL ARM7 microprocessor.
Memory
- Flash: 512 KB
- RAM: 128 KB
MS/TP MAC Address
Each BACnet MS/TP device must have a unique MAC address in the range 0–127 on the network segment. DIP switches on the controller set the MAC address.
Device Instance Number
The device instance number uniquely identifies each BACnet device on the system network. It is automatically assigned when added to a WEBStation-AX project but can be changed manually if required.
Termination Resistors
Termination resistors must be installed at both ends of the MS/TP segment bus between the positive (+) and negative (−) lines.
- Use 1/4W precision resistors
- 80–130 Ω recommended
- Ideally match cable impedance (commonly 120 Ω)
Shield Terminating
Proper shield grounding helps prevent communication problems caused by capacitive coupling. Ground the shield at only one end of the MS/TP segment, typically at the router.
Sylk™ Bus
Sylk is a two-wire, polarity-insensitive bus providing both 18 VDC power and communications between Sylk sensors and controllers.
Accessories
- TR71/75 Zio LCD Wall Module
- C7770A Air Temperature Sensor
- C7031G Outdoor Temperature Sensor
- P7640 Pressure Transducer Family
- C7232 CO2 Sensor Family
- C7600 Humidity Sensor Family
Mounting
The controller enclosure consists of a plastic base plate and snap-on cover. Wiring connections use removable terminal blocks, allowing wiring before or after mounting.
The controller can be mounted in any orientation and includes ventilation openings for heat dissipation.