Description
Micro VAV Controller
Description
The SZ1025b is a microprocessor-based controller designed for VAV terminal unit applications.
Features:
• 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
• Offers two independent modulating outputs
• Adjustable P+I+D control of modulating outputs
• Interface available for tri-state actuator motors
• Separate heating and cooling minimum and maximum CFM settings
• Four independent dry contact outputs
• Remote setpoint capability
• Supply air sensor input
• Two independent digital Inputs
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.
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