FlaktWoods STRA-14 - User Manual

STRA-14 Room controller. Installation and maintenance manual.
Fläkt Woods 8710 GB 2016.09.08
1 (12)
Specifications are subject of alteration without further notice.
STRA-14 for chilled beams
STRA-14 is the room controller for the motorised energy control
(MEC) and constant air volume chilled beams
It is possible to set different parameter values in a parameter menu
in the display, using the buttons on the controller. You change
parameter values with the INCREASE and DECREASE buttons and
confirm changes with the Function button.
Technical data
Supply voltage 18...30 V AC, 50...60 Hz
Internal consumption 2.5 VA
Ambient temperature 0...50°C
Storage temperature -20...+70°C
Ambient humidity Max 90% RH
Protection class IP20
Communication RS485 (EXOline or Modbus) with automatic detection/change-over
Modbus - Bacnet - MSTP 8 bits, 1 or 2 stop bits. Odd, even (FS) or no parity.
Communication speed 9600 bps (not changeable)
Built-in temperature sensor NTC type, measuring range 0...50°C, accuracy +/-0.5°C at 15...30°C
Material, casing Polycarbonate, PC
Weight 110 g
This product conforms with the requirements of European EMC standards CENELEC EN 61000-6-1 and EN
61000-6-3, and the requirements of European LVD standard IEC 60 730-1. It carries the CE mark.
Inputs
External room sensor PT1000-sensor, 0…50°C. Suitable sensor is Fläkt Woods STRZ-05
Occupancy detector Closing potential-free contact. Suitable occupancy detector is Fläkt Woods STRZ-09.
Condensation detector alt.
window contact
Fläkt Woods condensation detector STRZ-16 alt. window contact STRZ-38 resp.
potential-free contact
CO
2
sensor
STRZ-18 (0-10V).
Outputs
Forced ventilation 24 V AC actuator, max 0.5 A
Valve actuator alt. thermal
actuator
2 outputs
Valve actuator 0…10 V DC, max 5 mA
Thermal actuator 24 V AC, max 2.0 A
Control Heating or cooling
Actuator exercise FS = 23 hours interval
Terminal blocks So-called lift type for cable cross-section 2.1 mm2

Summary

STRA-14 Room Controller Overview

Technical Data

Key technical specifications including voltage, consumption, and environmental ratings for the STRA-14 controller.

Inputs and Outputs

Details the available inputs for sensors and outputs for actuator control on the STRA-14 controller.

Installation and Dimensions

Installation Instructions

Step-by-step guidance for installing the STRA-14 controller, adhering to safety regulations.

Physical Dimensions

Provides the physical dimensions of the STRA-14 controller in millimeters for installation planning.

Controller Operation and Handling

Wiring Diagrams

Illustrates the electrical connection diagrams for various sensors and actuators with the STRA-14.

Controller Handling and Display

Explains how to interact with the controller via buttons and understand the display indications.

Operating Modes for Chilled Beams

Outlines the specific operating modes (Boost, Occupied, Unoccupied) for different chilled beam models.

Detailed Wiring Information

Comprehensive Operating Modes

Off, Unoccupied, and Standby Modes

Details energy-saving modes like Off, Unoccupied, and Standby, specifying their operational characteristics.

Occupied and Bypass Modes

Explains the comfort (Occupied) and enhanced (Bypass/Boost) modes for normal and high-demand room usage.

Mode Activation Methods

Describes how operating modes are activated, including button presses, sensor inputs, and central control.

Function Button and Control States

Function Button Control Logic

Details how the Function button manages shutdown, Boost, and preset operating modes.

Occupancy Detector Integration

Explains how occupancy detectors influence mode transitions between occupied and energy-saving states.

System Control States

Defines various control states such as Heating, Cooling, and combined HVAC operations.

Advanced Control Features

CO2 and Cooling Control Logic

Covers CO2 impact on airflow and the logic for Cooling and Cooling/Cooling control states.

Free Cooling and Actuator Management

Details the Free Cooling function and the configuration of analogue and thermal actuators.

Condensation and Window Contact Inputs

Explains the functionality of condensation and window contact inputs for safety and operational control.

Safety and Ancillary Functions

Frost Protection

Describes the built-in frost protection mechanism to prevent low temperatures when the controller is not in use.

Lighting Control via Occupancy Sensor

Details how to use an occupancy sensor for controlling room lighting, turning it off when unoccupied.

Light Control Wiring Diagram

Provides the specific wiring diagram for implementing lighting control with an occupancy sensor.

Parameter Configuration

Parameter Menu Navigation

Guides users on accessing and navigating the parameter menu for custom controller settings.

Airflow and Nozzle Settings

Explains parameters related to airflow control and nozzle selection for various chilled beam models.

Parameter Management and List

Covers acknowledging settings, retrieving original values, and introduces the main parameter list.

Detailed Parameter List (Part 1)

Detailed Parameter List (Part 2)

Detailed Parameter List (Part 3)

FlaktWoods STRA-14 Specifications

General

Brand	FlaktWoods
Model	STRA-14
Category	Controller
Language	English