1.
INTRODUCTION
The CSC controller is designed to be simple to install and easy to use. The
controller is used in simple plants typically in schools, libraries and large domestic
installations. It may be installed either within a control panel or can be wall mounted.
The user can recall, display and adjust parameters quickly and easily, prompted by
the controller display. The facia has clearly labelled push-buttons for use when
setting the controller. There is an overlay card which must be placed over the
controller display for use in the Fine Tune Mode. A rotary selector switch is provided
to enable overrides to be quickly and easily applied.
The CSC controls the temperature of air in ducts or water flowing to radiators
throughout the building or zone. Each independent zone will need its own CSC
controller and associated equipment.
A 3 way mixing valve is normally used to control the water temperature by mixing the
cooler return water with the hot water from the heat source. Because boilers are
used to supply heat to the domestic hot water as well as heating radiators the CSC
must be used with a mixing valve. Where the heating system is independent the
boiler may be directly controlled by turning it on and off to control the output or flow
temperature.
The temperature of the flow water is monitored to ensure that desired value is
maintained to maximise energy savings. The hot water can be supplied by a boiler
or non-storage calorifier on a district heating system. The set point of the flow water
is determined mainly by the outside air temperature. As the outside air temperature
decreases the radiator water temperature is increased to compensate for heat loss.
This is the basic principal of how a compensator works. A space temperature
sensor can be connected to influence the flow temperature if required. The space
sensor allows the set point of the flow water to be increased or reduced as the space
temperature changes.
The CSC can only control one item of plant (either a valve or a boiler).
The CSC is shipped with standard (defaults) values for parameters. These default
settings are used so that in most cases only a minimal number of parameters need
to be amended to get the best out of the controller. It is important, however, that you
tune the CSC to your control system to get the best out of it. Typical default values
that should be checked/set are:-
•
Current time and Time-schedule (CSC 5352 only).
•
Valve/Boiler application selection.
•
Room Influence Operation.
•
Night Set Back Operation (CSC 5352 only).
•
Frost Logic and Set Point (CSC 5352 only).
•
Pump Exercise (CSC 5352 only).
•
Pump Overrun (CSC 5352 only).
•
Controller tuning.
CSC USER GUIDE
October, 03
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