Feature Notes
Boiler Cascade Submodule
CAS / DIN / 3T / 001     3 x Triac Outputs CAS / DIN / AOP/ 001  2 x 0-10v Outputs
Main Features Controls 1 or 2 Boilers (3T version only) or one single Low/High fired Boiler in conjunction with a Boiler Controller Optional Lockout monitoring or Stage Disable facility Up to 8 boilers (or 4 Low/High boilers or 4 modulating boilers) in one Sequence Control of modulating condensing boilers (AOP version) Individual Boilers can be enabled or disabled and specified as Condensing or Non Condensing.

Description of Features

User Features

LEDs show status of controller and Boiler Lockouts (if fitted)

Engineering Features

Works with SeaChange Boiler Controller to provide Sequence Control of Multiple Boilers (up to 8 stages in one sequence)

Optional inputs for Lockout Signals or Manual Stage Disable Switches automatically remove that Stage from the Sequence.

Configuration parameters ENBA and ENBB allow individual Boilers to be temporarily or permanently enabled/disabled

Configuration parameters CNDA and CNDB allow individual Boilers to be specified as Condensing, Condensing Boilers are always used in preference to non condensing Boilers if a mixture of Boiler types is present.

Boilers can be manually overridden ON or OFF, modulating boilers can be set at any firing level for test purposes.

DIN rail mounting, suitable for panel mounting.

Use of Lockout / Disable inputs

The Cascade module has two inputs which may be used to remove a boiler stage from the sequence in the case of a fault (eg. burner lockout signal) or because the stage is temporarily out of service (from a maintenance disable switch).  Alternatively, these inputs can be used to generate alarm signals which are transmitted to a SeaChange Doorway Superviser (locally connected to the system, or remotely connected via a Autodialing Modem).  The alarm inputs may be used to maintain boiler lockout conditions, in which case they will maintain the output relay for that stage until the fault is rectified, or used to shut down the Boiler if an alarm is detected. Alternatively they may be used as General Alarm inputs (for some other general plant fault) in which case the alarm is transmitted without affecting boiler sequencing.

Manual Override

The cascade module can be overriden using the Manual Override feature in InSite.

Fixed firing boilers: Boiler A will run if the manual level is above 5, Boiler B will also run if the Manual level is above 50.

Modulating Boilers: the modulating output will be set to the manual override setting.

Additional features for Analogue Output version

This version controls only one modulating Boiler, 'output a' provides a 0-10v modulating signal for the Boiler while 'output b' provides a 10v dc enable signal. A additinal relay will normally be needed to interface the enable signal to the boiler.

The Boiler can be specified as Condensing or Non Condensing, condensing Boilers will be used in preferance and will be run at maximum efficiency. See Boiler Controller features (issue 4d1 or later) for more information on the sequencing features.

Accessing Configuration and Monitoring Parameters

Configuration Parameters are used to adjust settings from their factory defaults; Monitoring Parameters are used to monitor internal readings (such as temperature readings) during the Commissioning process.

The Parameters may be viewed, and in the case of Configuration Parameters, adjusted by one of two methods; either by using a Zone Controller connected to the network, or by using the SeaChange Doorway Supervisor.

Using the Zone Controller:

a) The Zone Controller must be connected to the network and registered (see Commissioning Guide for further details).
b) Put the Zone Controller into Configuration Mode by depressing Select and Override buttons for 10 seconds, until the CNFG legend appears on the display.
c) Press Select button on the target device (in this case, the Cascade Module).
d) Hold down Select button on the Zone Controller, and rotate the rotary knob:
clockwise to view Monitoring Parameters
anticlock to view Configuration Parameters
e) When desired Configuration Parameter appears, release Select, hold down Override and turn knob to adjust the parameter (Monitoring Parameters cannot be adjusted).

Using InSite

InSite is the preferred Engineering tool, this software program will automatically document the system and give swift acces to all Monitoring and Configuration data. Lists of real time data are produced automatically.

Using SeaChange Doorway:

If Plant schematics are required then Doorway should be used. Data Points may be added to a Doorway page to access/adjust any Configuration or Monitoring Parameter. Graphs of certain Parameters are also available. The code used to access each parameter is shown in the adjacent tables.

Further details of how to set up Doorway pages may be found in the SeaChange Doorway Manual, or in the online help facility supplied with SeaChange Doorway.

The PC running SeaChange Doorway or InSite can be connected locally via a Serial Adaptor Module, via an IT intranet, or remotely using standard High-Speed Modems; all Parameters can thus be monitored and adjusted remotely.

Options and Product Codes

Boiler Cascade Submodule

CAS / DIN / 3T / [driver option]

Driver options

CAS / DIN / AOP/ [driver option]

Driver options

                                                                                                                    * On/Off signal via SeaChange relay module RLY/DIN/10V/6A

SC Controls Ltd

PO Box313
Wadhurst
East Sussex
TN5 6JL

phone 08707 606040
fax 08707 606041
e-mail seachange@sccontrols.co.uk
http:// www.seachange.co.uk