Control Features 

Field configured VAV algorithms 

Built-in actuator 70in.lb [8Nm] 

On board differential pressure sensor (pressure independent models) 

Manual or automatic pressure mode selection (pressure independent models) 

Configurable Inputs 

2 analog inputs 

2 digital inputs 

Configurable 

Outputs 2 analog outputs 

Up to 4 TRIAC outputs 

Configurable PI (Proportional-Integral) function 

Simple air balancing and commissioning via thermostat Independent,configurable proportional control band and dead band per ramp 

Selectable internal or external temperature sensor (10KO) 

External CO2 sensor input with integrated logic 

Change over by contact or external temperature sensor 

Freeze protection 

Operational Features 

24 Vac operation 

Backlit LCD with simple icon and text driven menus 

Configurable user display: setpoint, demand, temperature, etc. Selectable Fahrenheit or Celsius scale "Night Set Back" or "No Occupancy" modes with manual override 

Multi level lockable access menu 

Lockable setpoint Removable, raising clamp, non-strip terminals 

24Vac thermal fuse for overheat protection 

Network Communication BACnet MS/TP or Modbus RTU (selectable via menu) 

Select MAC address via DIP switch or via network 

BACnet MS/TP MS/TP @9600, 19200, 38400 or 76800 bps BACnet scheduler (up to 6 events) 

Firmware upgradeable via network 

COV (change of value) 

Copy and broadcast configuration to other EFCB modules via menu or network 

Automatic baud rate detection 

Automatic device instance configuration 

Modbus RTU Modbus RTU @9600, 19200, 38400 or 57600 bps RTU Slave, 8 bits (configurable parity and stop bits)

Model	Pressure	Triac	Feedback
EVCB14NIT0S	Independent	0	-
EVCB14NIT2S	Independent	2	-
EVCB14NIT4S*	Independent	4	-
EVCB14NDT4S*	Dependent	4	-
EVCB14NIT0SF	Independent	0	Yes
EVCB14NIT4SF*	Independent	4	Yes

* Includes options for "fan powered box" applications                                                                                  

Thermostat Model

Model	Size
TRL54	3 x 3
TRL24	2 x 3

More technical info on VAV systems
http://www.ashrae.org/File%20Library/docLib/Journal%20Documents/2011%20October/018-029_murphy.pdf

http://www.ashrae.org/File%20Library/docLib/Public/2006412101925_686.pdf
http://www.ashraeqatar.com/images/VAV_fundamentals_ASHRAE.pdf



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