Main Features No separate power supply required; power for electronics and motor derived from the LON network (42.4 V DC) Two wire connection reducing installation Costs Three sizes with stem force of 90N, 180N and 270N Fits standard Honeywell valves 2, 3 and 4 port from 15 to 40mm Ideal for Radiators, Chilled Ceilings, Chilled Beams and other Heating and Cooling Applications Actuator can be setup locally or remotely via InSite or Doorway Supervisor Automatic Recalibration and Power Sharing capability

Description of Features

General

Network powered Valve Actuator incorporates all the eatures of a SeaChange Actuator Driver mounted inside a Valve Actuator. The Actuator requires only the 2 - wire network connections; power for both the electronics and the 24 V AC motor is derived from the network.

Power sharing capability; network power supply and cabling can be rated well below the level that would be required to drive all the valves simultaneously. Instead the intelligent actuators monitor the power available and limit the number running at any one time within that limit. This is an inherent feature in the module that requires no set up or configuration.

Typical applications include radiators, chilled ceilings and chilled beams where actuator installation can offer simple yet supremely flexible zone control. The actuator will open or close the valve based on the control signal received direct from its SeaChange Zone Controller.

Up to 8 actuators, in any any combination of heating and cooling types, can be driven from a single zone controller.

Registration and building ‘Churn’

Intelligent actuators and their associated plant can be re-allocated to other zones or new zones as the office layout is ‘churned’ just by using the push-button registration process.

Installation

Major benefits are derived from the reduction in cost and complexity of installation; no separate mains distribution, transformers etc. need be installed. For Chilled Ceilings, only 1 cable (the network) need be installed in the ceiling void, and connected to all zone valves. Zone controllers can be separately wired through the floor void, thus avoiding cables penetrating the ceiling. For Radiators, the network cable can be discreetly installed, perhaps surface clipped to a skirting, in the same manner as telephone cable.

Power-up behaviour and recalibration

On power-up, the valve will be over driven closed for 120% of the valve travel time. This overdriving is repeated every time the actuator is driven to 0 or 100%. If the actuator has not been driven to either end during a 12 hour period, the actuator will overdrive fully closed.

Selecting Heating/Cooling Mode

It is possible to configure the Actuator Driver to act as a Heating Controller (factory default setting) or a Cooling Controller.

Hold down registration button; after 10 seconds output indicator lamp will flash:

• Red - indicates Actuator Driver has been set for Heating Mode.

• Green - indicates Actuator Driver has been set for Cooling Mode.

Releasing the button at this stage will have no effect.

Should you continue to hold down the registration button the flashing will change colour.

On release of the button the operation mode is altered.

• Red to green - mode has been changed from Heating to Cooling.

• Green to Red - mode has been changed from Cooling to Heating.

Repeat process to revert to previous mode.

The Heating /Cooling Mode can be changed from a configuration variable using InSite (version 3a only)

Setting Actuator for Reverse or Direct Acting Mode

The control action of the actuator may be set to Direct Acting Mode (factory default setting) or Reverse Acting mode.

When using 3 or 4 port valves, the control action needs to be set to Direct Acting Mode. i.e. 0% demand means the actuator stem will be fully retracted into the actuator body and the valve will be fully closed. This is the factory default setting.

Reverse Acting Mode means that on a decreasing demand signal the stem will be extended from the actuator body i.e. at 0% demand, the stem will be fully extended. This mode matches the action of a 2 port valve; with the stem fully extended, the valve will be fully closed.

Hold down select button; after 10 seconds status lamp will flash:

• Red - indicates Direct Acting Mode has been set i.e. 0% = stem retracted (Default)

• Green - indicates Reverse Acting Mode has been set i.e. 0% = stem extended

Releasing the button at this stage will have no effect.

Should you continue to hold down the registration button the flashing will change colour.

On release of the button the operation mode is altered.

• Red to green - mode has been changed from Direct Acting to Reverse Acting.

• Green to Red - mode has been changed from Reverse Acting to Direct Acting.

Repeat process to revert to previous mode.

The Reverse Acting Mode can be changed from a configuration variable REVA using InSite (version 3a only)

Configuration Parameters

The version 3a software is used on hardware which utilises a different processor which has more memory, this allows configuration parameters to be supported on the Intelligent Actuator for the first time. This provides a more convenient method of setting up the Actuator, heating/cooling or reverse/normal operation and allow the Actuator to be manually positioned for balancing purposes.

Demand Re-Scaling

The presence of configuration parameters also allows demand re-scaling in the actuator so when for example radiators are used in conjunction with underfloor heating the radiators can be set to 'top up' the heat from the underfloor by setting the demand range to be say 70 to 100%. This means that the radiator valve would not start to open until the demand got to 70% when it would open linearly as the demand increased to 100%. Similarly priority could be given to particular radiators in a room to provide more comfortable conditions throughout the seasons.

Retract and Extend

When commissioning it is often necessary to fully retract the actuator stem to enable it to be fitted onto the valve head. A configuration parameter ENDS is provided from issue 3d to enable this to be done. The actuator stroke range is typically four times the movement of the valve stem, so once the actuator is fitted selecting Extend will ensure the actuator motors to the fully in position on the valve .

Once the actuator has run for four times the normal stroke time the actuator automatically reverts to normal operation.

Valve Compatibility Table

Options and Product Codes

Intelligent Actuator Submodule

ACD / VLV / LPR / [option]

Options

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