DEOS VAV T4 RT Specification And Installation Instructions

Models
VAV T4 RT
(4 TRIACS / pressure independent)
VAV CT 24 (
Thermostat 2x4)
Description
The DEOS Zoning System provides a simple and efficient demand-
based control of pressure independent and pressure dependent
VAV zones with roof top units (RTU) in light commercial
applications (2 to 20 tons). These products provide a local BACnet
MS/TP communication bus to ensure data exchange of all required
information between the zones and the RTUs, which permits
seamless integration with a third party BMS system.
Features

Field configured VAV algorithms, inputs and outputs

Built-in actuator, 70 lb-in

On board differential pressure sensor

Simple air balancing and commissioning via thermostat

Automatically sets operation mode to pressure dependent or
independent based on the presence of air flow

Configurable PI (Proportional-Integral) function

Independent, configurable proportional control band and dead
band per ramp

Selectable internal or external temperature sensor (10KΩ)

Changeover by contact or external temperature sensor

Freeze protection
Operational Features

Backlit LCD with simple icon and text driven menus

Select thermostat's default display

Network service port via on-board mini USB connector

Manual night set back or no occupancy override

Multi-level lockable access menu and setpoint

Selectable Fahrenheit or Celsius scale

3-wire connection to controller and 4 push buttons
Controller Specifications
Description
Torque
Power consumption
Running time through 90º
Power supply
Inputs
On-board differential pressure sensor
Outputs
Real Time Clock
BACnet
Communication connection
Electrical connection
Operating temperature
Storage temperature
Relative Humidity
Weight
The actuator performs an auto-stroke on power up. When changing the actuator adjustment screws, cycle power
to initiate the auto-stroke.
VAV T4 RT-IOM-170712-ESA.docx
VAV Zone Controller for Zoning System
70 in.lb. [8 Nm] at rated voltage
10 VA max
90 seconds
22 to 26 Vac 50/60 Hz
2 Universal inputs (Thermistor 10KΩ Type 3, digital 24Vac/dry contact, or 0-10Vdc)
2 digital inputs
0-1.0" WC
2 analog outputs (0-10 Vdc or 2-10Vdc; selectable)
Up to 4 TRIAC outputs 24 Vac, 500mA max thermal fuse in series with each TRIAC output (on/off,
pulse, or 2 floating outputs)
Real-time clock (RTC) with super capacitor backup (approximately 3 days)
®
BACnet MS/TP @ 9600, 19200, 38400 or 76800 bps (B-ASC)
24 AWG twisted-shield cable (Belden 9841 or equivalent).
Maximum 50ft (15m) between controller and thermostat
2
0.8 mm [18 AWG] minimum
0ºC to 50ºC [32ºF to 122ºF]
-30ºC to 50ºC [-22ºF to 122ºF]
5 to 95% non condensing
1.8 kg. [4 lb]
Specification and Installation Instructions
VAV T4 RT / VAV CT 24
Applications

Single duct, cooling only

Single duct cooling and/or heating

Up to 4 stage reheat and/or cool

Up to 4 On/Off heat and/or cool

Up to 4 time proportioned (TPM) heat or reheat

Up to 2 analog (0-10Vdc) reheat and/or cool

Up to 2 floating heat and/or cool

Pressure dependent or pressure independent

With or without auto changeover

Supply/exhaust (requires an additional VAV Controller)
Network Communication

BACnet MS/TP communication port

Select MAC address via DIP switch or via network

Automatic baud rate detection

Automatic device instance configuration

Copy & broadcast configuration via thermostat menu or
via BACnet to other controllers

BACnet scheduler

Firmware upgradeable via BACnet
VAV T4 RT
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