From Site Assessment to Commissioning: What to Expect During an RECD Installation
There’s a specific kind of uncertainty that comes with any project you’ve never done before, and RECD installation tends to fall squarely into that category for most facility managers. It’s not a routine purchase like ordering equipment off a catalogue, and it’s not vague and undefined either — it’s a structured process with distinct stages, each of which requires something specific from you and delivers something specific in return. Understanding that structure in advance is genuinely useful, not just as reassurance, but because it tells you what to ask for at each stage and what a provider skipping a step actually looks like.
This article walks through that process end to end — six stages, from the first data you’ll be asked to share through to the ongoing relationship after commissioning — with enough detail at each stage that you’ll know what a properly run project looks like versus one that’s cutting corners.
Stage One: Sharing Project Data
Every credible RECD project starts here, and it’s worth being specific about why this stage exists at all rather than treating it as a formality before “the real work” begins. A generic kVA-only quote — where a provider gives you a price based solely on your generator’s rated capacity, without asking for anything else — is a strong early signal that the technical evaluation that should follow this stage is being skipped entirely.
The data genuinely needed at this stage includes:
DG-set make, model, and kVA rating — the foundational specification any evaluation builds from.
Engine nameplate details and manufacturing year — this connects directly to the CPCB retrofit applicability question, since much of the current retrofit framework is oriented around generators manufactured within a specific older window.
Typical load pattern and operating hours — not a theoretical maximum, but how the generator is actually used, since this affects everything from regeneration behaviour to overall system sizing.
Current diesel consumption and fuel-cost data — useful baseline information, particularly if dual fuel is also part of the conversation alongside RECD.
Clear installation photographs and available space around the exhaust line — gives the evaluating team a genuine sense of physical constraints before committing to a specific product configuration.
The quality of everything that follows in this process is directly tied to the accuracy and completeness of what’s shared at this stage. A rushed or incomplete data submission tends to produce a less reliable evaluation downstream — this is worth taking seriously even though it can feel like an administrative step rather than the “real” part of the project.
Stage Two: Technical Evaluation
With your data assembled, the evaluation stage is where a provider actually determines whether your generator is a suitable RECD candidate, and if so, works out which specific product configuration fits its exhaust characteristics and operating pattern.
This stage should involve genuine technical analysis, not a rubber-stamp confirmation:
Assessing exhaust flow characteristics against available DPF and DOC configurations, since filter and catalyst sizing needs to match your generator’s actual exhaust volume and characteristics, not just its rated kVA.
Reviewing load and duty cycle for regeneration suitability — as covered in detail in our companion article on how DPF and DOC technology actually works, passive regeneration depends on sustained exhaust heat, which depends on load. A generator running consistently light or highly variable loads needs this factored explicitly into the configuration recommended.
Identifying site constraints that affect installation design — available space, access considerations, and any physical limitations that emerged from the photographs and data shared in stage one.
Flagging any additional information genuinely needed before a firm, specific recommendation can be made — a sign of a thorough evaluation is a provider willing to ask follow-up questions rather than proceeding on incomplete information.
This is also the stage where a realistic emission-reduction expectation should be set for your specific generator — grounded in your actual data, not simply repeating a published maximum figure as though it were a guaranteed outcome. We’ve written a full piece on why treating published percentages as guarantees is a mistake, if that framing is new to you.
Stage Three: Site Assessment
Beyond the desk-based technical evaluation, a physical or detailed remote site assessment examines the practical, on-the-ground installation conditions that data and photographs alone can’t fully capture:
Available space for the RECD unit and its housing, confirmed against the actual physical envelope of the installation location, not just estimated from photographs.
Exhaust routing and any modifications required to accommodate the retrofit hardware without compromising engine performance or exceeding acceptable backpressure limits.
Access for both installation and future maintenance — a system that’s difficult to physically reach for regeneration servicing or filter maintenance creates ongoing operational friction long after installation is complete.
Structural, ventilation, or safety considerations specific to the location — particularly important for facilities with constrained plant rooms, rooftop enclosures, or space shared with other critical infrastructure.
This stage is where theoretical fit, established during technical evaluation, gets confirmed or adjusted against physical reality. It’s a meaningful checkpoint, not a redundant repetition of stage two.
Stage Four: Installation
With drawings and hardware approved following the previous stages, installation is where the RECD physically becomes part of your generator system. This involves coordinated work across several disciplines:
Mechanical fitment of the DPF and DOC housing into the exhaust path, engineered to the routing and space constraints identified during site assessment.
Electrical integration of the sensors and monitoring controls that track exhaust temperature, pressure differential, and general system status — the monitoring layer that, as covered in our technical deep-dive on RECD components, is central to sustained performance rather than an optional add-on.
Coordination with existing generator control systems, ensuring the RECD’s monitoring and any active regeneration triggers integrate cleanly with how the generator is already operated and controlled.
Installation quality at this stage has a direct, lasting effect on system performance — a rushed installation, or one with poorly executed exhaust routing, can undermine the performance of an otherwise well-specified RECD product. This is a stage where cutting corners saves time upfront and costs performance and reliability for years afterward.
Stage Five: Commissioning Checks
Before any handover, the system needs verification under real operating conditions — this is what separates a physically installed device from a properly commissioned system that can actually be relied upon for performance or compliance purposes.
Commissioning should cover:
Operating parameters checked against expected ranges — exhaust temperature and pressure differential readings compared against what the technical evaluation projected for your specific configuration.
Alarm and monitoring function testing — confirming that the sensor and monitoring layer actually detects and flags the conditions it’s designed to detect, rather than assuming functionality based on installation alone.
Safety response behaviour confirmed — verifying that any safety-relevant system responses behave as designed under real, not simulated, operating conditions.
Overall performance checked against the technical evaluation’s expectations — a genuine comparison against the realistic performance range established during stage two, not against a generic published maximum.
A device that’s been physically fitted but never verified under load through this kind of structured commissioning process isn’t something a facility should rely on for compliance documentation or performance claims — regardless of how confident the installation team may be that everything is working correctly.
Stage Six: After-Sales Support
Commissioning marks the end of installation, not the end of the relationship. Ongoing performance depends on:
Maintenance guidance specific to your RECD configuration and duty cycle — generic maintenance advice that doesn’t account for your generator’s actual regeneration pattern and operating conditions is of limited practical use.
Service assistance for regeneration issues, sensor faults, or filter servicing as they arise over the system’s operating life — these aren’t hypothetical; well-maintained systems still need periodic attention, and how quickly and effectively that attention is available matters considerably.
Documentation support for ongoing compliance requirements — since compliance isn’t a one-time event at installation but an ongoing status that needs to be maintained and, when required, demonstrated.
A retrofit provider’s genuine commitment to this stage is one of the more reliable signals of overall project quality — it’s easy to sell a product and disappear after installation; it’s harder, and more valuable to the facility, to remain genuinely available for the years of operation that follow.
What to Ask at Each Stage
A well-run RECD project should be able to explain clearly, at any point, which stage the project is in and what’s needed next from either side. If a provider moves directly from your kVA rating to a firm quote without asking about load data, operating hours, or site photographs, that’s a fairly reliable sign the technical evaluation stage — stage two above — is being skipped or treated as a formality rather than genuine analysis.
Similarly, if a provider treats commissioning as a formality rather than a genuine verification process — installing hardware and calling the project complete without documented performance checks against expectations — that’s worth questioning before accepting handover.
Why the Sequence Itself Matters
It’s worth stepping back to note why this six-stage sequence exists as a sequence, rather than a set of tasks that could happen in any order or be compressed into fewer steps. Each stage genuinely depends on the one before it: technical evaluation needs accurate project data to mean anything; site assessment confirms and refines what technical evaluation established theoretically; installation executes what site assessment confirmed was physically feasible; commissioning verifies what installation actually achieved; and after-sales support sustains what commissioning confirmed was working correctly at handover.
Skipping or compressing any stage doesn’t just save time — it removes a specific verification step that the following stage depends on, which is exactly how RECD projects end up underperforming their expected results despite using perfectly capable hardware.
Start With Stage One
Every properly run RECD project begins the same way — with your generator’s actual data, not a product decision made in advance of understanding your specific situation. Send your DG-set details and site photographs to our team, and we’ll walk your project through each of these six stages, from evaluation through to long-term after-sales support.
You can learn more about the technology itself on our Retrofit Emission Control Device page, understand the engineering behind DPF and DOC components in our companion technical article, or check our FAQ page for other commonly asked questions about the process.