Delta Partner ACME Technical Services Ltd. have been servicing and modifying the control system at SC Johnsons on their Frimley site since the 2000. SC Johnson wanted to improve the comfort level within the offices for their employees in a major refurbishment, including the controls system which would also reduce their operating and energy costs. The replacement system needed to operate on the existing two core twisted screened cable which runs from the touchscreen around the local lan. The other consideration was that none of the tochscreens were connected so to reduce the installation cost the new system would have to utilise the customers’ existing Ethernet IP network. Delta was the perfect fit with the Bacstat making the final decision easy.
Systems solution: Refurbishment of the offices allowed unprecedented access to the existing fan coil units. This opportunity was taken improving the office comfort for the occupants with locally mounted sensor setpoint devices. To reduce energy costs ACME also monitored the stand alone PIR lighting control system. This allowed unoccupied rooms to be sent to standby mode operation, stopping the fan and relaxing the heating and cooling setpoints until the room was occupied again or the temperature deteriorated away from the standby heating and cooling setpoint values.
Results: Maintenance time has reduced as area setpoints can now be altered from any workstation on the companies intranet once a username and password is entered. The facilities department can check the automatic temperature trend logs present in the outstations at any time without having to manually set the trending beforehand. This allows site engineers to identify correct valve performance, or prove valve operation. Valve actuators can be easily overridden and room results monitored. This feature allows better targeting of site labour and reduced disturbance the office staff and ceiling grid. Any generated alarms are routed to the appropriate engineer in the form of an email, again allowing the correct information to pass to the right engineer.
The system comprises of an Orcaweb client server BMS PC, 4 DSC main plant controllers, 135 DAC application controllers and 68 Bacstats. Predominantly this equipment controls the office areas, some temperature controlling split A/C units but mostly controlling FCU’s with heating and chilled water motoric valves. ACME Technical Services Ltd has also replaced AHU controllers and main plant boilers / chillers and integrating the other control systems on site, namely Production Area AHU’s and Warehouse Trend burner controlled outstations.