SZ1025b

VAV Box Controller

Description
The SZ1025b is a microprocessor-based controller
designed for VAV terminal unit applications.
Features:

• Stand-alone or network operation
• Zigbee wireless ready
• 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

Call to order:

1-800-288-9383

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
Common mode rejection:
100 db @ 60 Hz
Power consumption:
10 VA max