MicroScan Variable Air Volume (VAV) Controller
Technical Specifications
Part No.
MS-VAV-AO
Physical
Dimensions: 8.87” W x 4.88” H x 2.4” D [0.225 x 0.124 x 0.609 m]
Weight: 1.42 lb [0.644 kg]
Environmental
Operating Temperature: 0°C to 50°C
Storage Temperature: -25°C to 80°C
Processor
25 MHz, 8-bit microcontroller
Memory
4 kB high-speed RAM
64 kB non-volatile FLASH EEPROM for storing code and VAV configuration settings
Supply Voltage
24VAC ±10% 60 Hz or
30–38VDC
Communications
EIA-485 Bus, MS/TP
Speeds: 1200, 9600, 19200, 38400 baud
Digital Inputs
(2) Dry-contact:
- Occupancy override input
- Occupancy status input
Analog Inputs
(5) 12-bit ADC:
- Room temperature input: 500–1500 resistive input or 4–20mA loop power
- Setpoint adjust input: 1000 resistive input maximum
- Supply air (box discharge input): 500–1500 resistive input
- Auxiliary input (jumper selectable): 0–5V/0–10V/4–20mA loop power
- CFM sensor input: fully integrated on-board sensor: 0–2″ standard, optional 0–5″ or 0–1″
Digital Outputs
High-current digital output triacs @ 24VAC
- Lights on (12VA)
- Lights off (12VA)
- Fan control (12VA)
- Digital heat 1 (12VA)
- Digital heat 2 (12VA)
- Digital heat 3 (12VA)
Analog Outputs
- Damper Control
- Reheat valve control
Utilizes 12-bit DAC for excellent control resolution. 4–20mA or 0–10VDC selectable, 24VAC, 3-wire configuration
Actuator
Integrated tray actuator featuring brushless action capable of delivering up to 35 IN-lb (4 Nm), modulating action
Specifications subject to change without notice
Versatile
Pressure-independent control over a broad range of pressures and the entire operating temperature range. Compatible with all industry-standard sensors and controls, including damper actuators and valves.
- One stage of proportional/integral heating control
- Two types of cooling control: proportional/integral
- Up to three stages of digital heat control: control several different terminal VAV applications with the same electronics
- Four constant-speed fan control strategies
Easy to Install
Installation requires only a single mounting screw and the attachment to the VAV damper actuator.
Features + Benefits
- Lightning control
- Precise analog and integral 24VAC actuators
- Velocity pressure sensor
- Surface-mount integrated circuit technology
- Flash memory
- InfoScan system integration for VAV terminal unit control