Siemens BMS Contractors London
Alpha Controls are a certified Siemens System Integrator based in Gravesend, serving Greater London. We design, install, commission and maintain Desigo CC installations — independent of Siemens OEM pricing, with full access to commissioning software and manufacturer support.
Siemens Building Controls: The Platform in Detail
Siemens Desigo is a comprehensive platform spanning supervisory control (Desigo CC), field-level controllers (PX/RX series), room automation, and residential heating control — with optional KNX integration for lighting and blind control.
What Alpha Controls Delivers on Siemens Projects
Why Commissioning Quality Matters
The work that determines whether a Siemens BMS actually performs is in the programming and commissioning — writing the plant sequences in PRVS, configuring Desigo CC graphics that operators can actually use, setting up alarm priorities correctly so the site team does not spend half the day silencing nuisance alerts.
Wrong Desigo CC configuration produces real problems: alarms routed to the wrong operators, energy meters not trending, plant running in override because the sequence was never commissioned properly, graphics that show wrong values because the object bindings are incorrect. These are not edge cases — they are what we find on the majority of inherited systems we audit.
Standards and Compliance
EN ISO 16484 — Building Automation and Control Systems (BACS) is the international standard governing BMS design and installation. Part 3 defines the system functions a BACS must provide; Part 5 specifies the BACnet data communication protocol. Alpha Controls commissions Siemens systems to EN ISO 16484 Part 3 functional requirements. Desigo CC and the PX/RX controller range are fully BACnet-compliant, satisfying the data communication requirements of Part 5.
CIBSE Guide H — the UK design and commissioning reference for building controls professionals — defines responsibilities for design, installation, commissioning, and documentation. Alpha Controls follows Guide H methodology on all projects: point schedules produced before installation, commissioning records witnessed at handover, and O&M documentation delivered as a standard deliverable.
Coverage: Greater London
Alpha Controls is based in Gravesend, Kent — 30 minutes from Central London without traffic. We work across Greater London including the City of London, Canary Wharf, West End, South Bank, and out to the suburban boroughs. Our engineers are on London sites most weeks. We hold current CSCS cards, IPAF, and relevant site inductions, and are familiar with working in occupied commercial buildings.
Frequently Asked Questions — Siemens BMS London
What is the difference between Desigo PX and Desigo RX controllers?
PX controllers (PXC compact and modular range) are heavy-duty DDC units for complex plant — AHUs, chillers, boilers. They handle large I/O counts and run advanced PID and sequence logic. RX controllers (RXB, RXC, RXZ) are lighter room-level devices for fan coil units, VAV boxes, and zone temperature control. Both sit on the same BACnet network reporting to Desigo CC.
Do I need to use Siemens directly for Desigo CC configuration?
No. As a Siemens System Integrator, Alpha Controls can configure and maintain Desigo CC to the same standard as a Siemens field engineer — at independent rates. Many FM managers do not realise this and pay OEM rates unnecessarily. We provide PPM, reactive callout, software updates, and Desigo CC configuration changes under an independent service agreement.
We have inherited a Siemens Desigo system. Where do we start?
Start with a controls audit. Alpha Controls will attend site, review the existing Desigo CC configuration, check controller firmware versions, identify any unlicensed points or expired software subscriptions, and document the current system state. We then produce a remediation plan.
Can Alpha Controls take over a Siemens maintenance contract from the OEM?
Yes. As a Siemens System Integrator, we provide PPM, reactive callout, software updates, and Desigo CC configuration changes under an independent service agreement — typically at lower cost than direct OEM rates.
What does PRVS software do and why does it matter?
PRVS (Plant Regulation and Visualisation Software) is Siemens' engineering tool for programming Desigo PX controllers. It handles the control sequences, PID loops, interlocks, and strategy logic. PRVS is proprietary to Siemens — engineers trained on other platforms cannot use it effectively. Wrong PRVS programming produces real problems: alarms routed to the wrong operators, plant running in override, energy metres that are not trending.
Talk to a Siemens BMS Engineer
Whether you need a Desigo CC audit, a new Siemens BMS installation on a London project, or want to move your maintenance contract to an independent contractor — Alpha Controls can help.
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