VAV Box Controller
SZ1025bDescription
This highly configurable microprocessor-based controller is specifically designed for VAV terminal unit applications.
Specifications
Display:
32-Character LCD
Communications:
RS485, half-duplex, TCSbus
Operating temperature:
32 to 131°F (0 to 55°C)
Operating humidity:
0 to 100% RH, non-condensing
Supply voltage:
24VAC
Independent Modulating Outputs:
Two
RTD Inputs:
Two platinum:
- Range: Room Temp: 40 to 90°F
- Supply Air Temp: 50 to 150°F
Digital Inputs:
Two (dry contact)
Digital Outputs:
Four (SPST dry contact, 24 AC @ 2A)
QE25 Conversion:
Four triacs (24VAC @ .5A)
Configurable Options
• Stand-alone or network operation
• Built-in velocity pressure sensor with K-factor correction
• Pressure dependent or pressure independent operation
• Capable of controlling series or parallel fan-powered boxes
• Adjustable P+I+D control of modulating outputs
• Interface available for tri-state actuator motors
• Separate heating and cooling minimum and maximum CFM settings
• Remote setpoint capability
• Supply air sensor input
Specs & Docs
Specifications:
General
Accuracy: +/- 0.5%
Programming: EIA RS485 interface
Display: 32- Character LCD
Communications: RS485, half duplex
Memory backup: Non-volatile EEPROM, no battery required
Environmental
Operating temperature: 32 to 131°F (0 to 55°C)
Operating humidity: 0 to 100% RH, non-condensing
Storage temperature: 14 to 140°F (-10 to 60°C)
Electrical
Supply voltage: 24 VAC
Inputs: Two platinum RTDs, Two digital (dry contact)
Range: Room Temp: 40 to 90°F
Supply Air Temp: 50 to 150°F
Outputs: Two 4 to 20 mA analog, Four digital (SPST dry contact, 24 VAC @ 2 A),
QE25: four triacs (24 VAC @ .5 A)
Max. load resistance (analog output): 600 Ω
Common mode rejection: 100 db @ 60 Hz
Power consumption: 10 VA max
Specifications subject to change without notice.
