SYX661-CSC Commissioning Guide
V1.1 10/2020
Page 3 of 17
1.
INTRODUCTION
The SYX661 CSC controllers are configured by the installer in the field to provide control of simple Variable
Temperature plant. The flow setpoint is calculated based on the standard VT slope principle to cater for building heat
losses. The VT valve is modulated to control the flow temperature required. If the controller is overridden to Night
mode, open the NSB contact) the flow setpoint is reduced by the night reduction setting. If the controller is overridden
to Boost mode, open the Boost contact) the flow setpoint is increased by 20’C. The temperature can be limited by
flow maximum and flow minimum settings.
Controllers will also provide alarm indication via a dedicated output. This will close should a sensor fail or if the flow
high limit alarm has been triggered. (5’C above Flow Max setting for 30 seconds)
The info button provides direct access to visual indication of all input and output status.
The Malfunction button allows the alarms to be seen and actioned
There is a user button to quickly acknowledge and clear Alarms
The simple user screen is text based using simple language and is backlit for easy use in poor plant room lighting.
The internal web browser allows local site and remote site monitoring/supervision. Users can interrogate relevant
parameters with 3 distinct user levels. Access levels are changed by entering the correct code between: Information
Level (default), Change Level, Set-up level.
Historical records of temperature are taken at regular intervals and sensor are monitored for their operational
condition. Performance can be assessed and savings increased through better information and analysis. Simple
configuration and simple use are key features of the SYX661-CSC Controllers.
