Pool Controller with 3 x Triac Outputs
POL / DIN / 3T / ...
Main Features Ideal for Swimming Pool Applications Controls water temperature in swimming pools Drives a variety of pool plant Pool Temperature Display and Setpoint Supervision via a standard zone controller

Summary Features

General

The Pool Controller is used to control the water temperature in a swimming pool. It has an input for a temperature sensor (which is typically mounted on the return pipe from the pool) and 3 Triac Outputs; several variants are available which give different configurations of outputs to drive Raise/Lower type valves with pump, or Time-Proportioning drive for pump only and so on.

The Pool Controller may be used in conjunction with a Zone Controller, which can be configured as a remote display. The Zone Controller may be set to use the measured temperature from the Pool Controller as its Process Variable; this means that it will display the Pool temperature, and the label POOL, in place of its usual ROOM temperature display. The Zone's feature of Time Schedule Supervision may also be used to adjust operating times for the pool if desired.

The default setpoint is set at 30 degC, the temperature measurement is called POOL which can be displayed on a standard Zone Controller (remote PV). The controller is designed to control the pool temperature using the return pool temperature.

The controller supports time zones which can be slaved to a master Zone Controller, in which case the Pool optimum start (for applications where the temperature is not maintained 24 hours/day) will be controlled by the Pool Controller, alternatively the controller can be setpoint slaved from a Zone Controller in which case the Optimum start will be carried out by the supervising controller.

The controller is based on the standard Zone code so retains some features which are not used in this application, e.g. the cooling loop.

Description of Features

Optimum Start/Stop

The MaXimum Optimum Start time is set on parameter MXOS. The allowable error (droop) to terminate Optimum start can now be set on a config variable OPTE. The MaXimum Optimum Off time is set on parameter MXOF. When Optimum off is invoked the controller remains occupied but the control deadband is increased to the 'standby setting' see SBDB. Optimum off can be disabled by setting MXOF to 0.

Frost Protect

The Pool Controller can be made aware of the Frost protection status of the Boiler (or other heat source). If parameter FRPT>0 then the controller will receive FRST alarms from the Boiler. When the Boiler is in Frost protect the controller's output will be forced to 50% (if FRPT=1), and if FRPT=2 any OSS switched loads will be operated. The Pool Controller remains in non-occupied during this Frost Protection feature.

Occupation Destination

An additional network variable which passes on the Occupation state of the controller has been added. This feature (set on parameter OCDS, occupation destination) allows the occupation status of many controllers to be passed to a common Air Handler for example, see AHU notes. This output can also be used with DHW Controllers from issue 3c1 onwards.

Alarm Support

The controller supports the following alarm conditions:

The following alarm modes are supported:

Alarm state ALST not used at present

Networked Sensor

The controller can now use a networked sensor for it's measured value, as opposed to a hard-wired sensor. This is registered to the Pool Controller. To use the networked sensor in preference to a hard-wired sensor set SACT =5.

External Source for Occupation State (timeclock etc)

Support has been added to allow the Occupation state of the controller to be determined by an external input. To activate this state set sensor action SACT to 4 and wire the external signal (volt free contact only) to the (centre) terminals 3-4. A closed contact will force occupation. This has been implemented as an OR function with our in-built time schedules. If the external source is to be the only occupation signal then disable the inbuilt time schedule by setting all days to no occupation. The state of the external signal can be monitored at input 8 (I8) XOCC.

Additional config variables

Override extension time

A config variable XHRS allows the 'out of hours' run time to be configured. This parameter can be set from 0.0 hours to 8.0 hours with a resolution of a tenth of an hour.

Occupied and non Occupied setpoints

These are now available as config variables, the Occupied setpoint can be changed within the limits defined by setpoint mid point SPMD and setpoint range SPRG. The non occupied setpoint can be set anywhere within the allowable setpoint range which has been increased to 5-95C.

Standby deadband SBDB

This defines an additional amount of deadband to be applied when the controller is in 'standby mode'. This is used for Optimum off and also on some specialised applications more relevant to the Zone Controller.

Heating Constant Temperature HTCT

This parameter if set to a non zero value defines that the controller should send a CT setpoint instead of the normal percentage demand. The value set is the Constant temperature value which will be sent to the Heat Source. This should only be set when the Heat Source is a Boiler Controller.

Options and Product Codes

Pool Controller

POL / DIN / 3T / [driver option]

Driver options

	Input Configuration
Input 3-4	VFC status / alarm / occupancy (optional)
Input 5-6 ‘temp’	Pool Temp Sensor

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