DDC Controls for HVAC Systems
DDC controls for HVAC cover the panels, wiring, sensors, actuators, programming and graphics that run chillers, AHUs, FCUs, VAV boxes, pumps, dampers and valves. Work follows the consultant's sequences of operation, with ASHRAE Guideline 36 where specified, in Riyadh, Jeddah, Dammam and Khobar. Handover includes control schematics, I/O lists, functional test records and trend logs.
HVAC controls decide whether a well-designed plant behaves well. DDC (direct digital control) panels read temperature, pressure, flow and status signals and drive valves, dampers and fans according to a programmed sequence. The package covers chillers and chilled water pumps, air handling units, fan coil units, VAV boxes, exhaust and fresh air fans, dampers and control valves, together with the panels, field wiring, sensors, actuators, programming and operator graphics.
Sequences of operation come from the consultant and are the contract document for the programming. Where the specification calls for them, ASHRAE Guideline 36 high-performance sequences are programmed as written, including supply air temperature reset and duct static pressure reset. NLS Contractors reads each sequence against the equipment schedule and the point list, and raises any contradiction, such as a sequence that needs a sensor the BOQ does not list, as a written clarification before pricing.
Interfaces matter as much as the panels. VFDs, chiller panels and packaged units arrive with their own controllers and talk BACnet or Modbus, and the DDC package reads them and, where specified, commands them through that link. Control valves and damper actuators are usually fitted by the mechanical contractor and wired and commanded by the DDC package, and the offer writes that split down line by line. Coordination with the TAB agency starts early, because balancing needs the controls working in manual and then in automatic, and a controls package that is late holds up the whole HVAC handover.
Handover documents are control schematics, I/O lists, panel drawings, functional performance test records, commissioning records, controller program backups, and trend logs that show the plant holding its setpoints under load. Operator training is part of the package.
A typical enquiry reads: HVAC DDC control system, supply, programming, testing and commissioning. To price it in Riyadh, Jeddah, Dammam or Khobar, send the HVAC equipment schedule, the control schematics or the controls specification, the point list or BOQ, and the programme dates. Price and lead time depend on the point count and the integration scope, and the offer states both.
Specifications
- ✓Equipment controlled: chillers, AHUs, FCUs, VAV boxes, pumps, dampers, control valves and fans
- ✓Panels, field wiring, sensors, actuators, programming and operator graphics
- ✓Sequences of operation from the consultant; ASHRAE Guideline 36 where the specification calls for it
- ✓Interfaces to VFDs and chiller panels over BACnet or Modbus; coordination with the TAB agency
- ✓Handover: control schematics, I/O lists, functional performance tests, commissioning records, trend logs
Frequently Asked Questions
Do you program to ASHRAE Guideline 36?+
Where the specification names it, yes. The high-performance sequences are programmed as written and tested in the functional performance tests. Where it is not named, the consultant's own sequences apply.
Who fits the control valves and damper actuators?+
Usually the mechanical contractor fits them in the pipe and duct, and the DDC package wires and commands them. The offer states this split so no item falls between the two packages.
How does the controls package work with the TAB agency?+
Balancing needs working controls, so the DDC package is ready for manual override and then automatic mode before the TAB visit. Coordination dates are written into the programme.
Why are trend logs part of handover?+
They record temperatures, pressures and valve positions over time and show the plant holding its setpoints under load. The consultant uses them to accept the sequences, and the operator uses them to diagnose later.
Who supplies DDC Controls for HVAC Systems in Saudi Arabia?+
NLS Contractors (Northlane Solutions Company) supplies DDC Controls for HVAC Systems across Saudi Arabia, including Riyadh, Jeddah, Dammam and Jubail. Send your specification and quantities to info@nlscontractors.com or info@northlanesolution.com for a quotation.