Common RECD Installation Mistakes to Avoid

Most RECD installations go smoothly. The ones that don’t almost always trace back to one of a fairly small, repeatable set of mistakes, made either before the installation crew ever arrives, during the physical fitting itself, or in the weeks after the job is supposedly finished. This guide walks through eleven of the most common ones, grouped by when they happen, with the actual consequence of each and the straightforward fix.

If you’re still in the planning stage, read this before you sign a vendor contract, not after. Several of these mistakes are far easier to avoid than to fix once the unit is already fitted, and a couple of them are essentially free to prevent but genuinely expensive to correct once a generator has been running with the problem quietly present for months.

It’s also worth saying plainly that none of these mistakes reflect a flaw in RECD as a technology. A correctly installed and properly maintained unit is straightforward, reliable equipment. What follows is a list of process failures, decisions made under time or cost pressure, that happen around the equipment, not problems with the equipment itself.

Quick Reference: Where Mistakes Cluster

Stage	Most Common Mistakes	Typical Consequence
Before installation	Vendor selection on price alone, rushed site survey, capacity band mismatch	Wrong unit, weak paperwork, delays
During installation	Poor mounting and sealing, ignoring backpressure limits, skipped commissioning test, incomplete documentation	Performance loss, engine strain, compliance gaps
After installation	Neglected maintenance schedule, no staff awareness, delayed paperwork filing, assuming one technology fits every unit	Premature failure, inspection risk, avoidable penalties, mismatched solution

Category One: Mistakes Made Before Installation Even Begins

Mistake 1: Choosing a Vendor on Price Alone

Why it happens. RECD quotes can vary widely, and a lower number is genuinely tempting when you’re already treating this as a compliance cost rather than an investment. It’s easy to assume all CPCB-approved units are roughly interchangeable.

The real consequence. The cheapest quote sometimes comes from a vendor cutting corners on fabrication quality, using a generic unit not properly matched to your generator’s exhaust geometry, or, in the worst cases, offering paperwork that doesn’t hold up to scrutiny. A unit that fails a pollution control board inspection because its documentation doesn’t check out isn’t cheap at all once you count the re-work.

The fix. Compare vendors on their actual type approval and test certificate documentation, not just price. Learn to read that paperwork properly using our guide to reading an RECD test certificate, and don’t be shy about asking a vendor directly for their CPCB reference number before committing.

Mistake 2: Rushing or Skipping the Site Survey

Why it happens. Site surveys feel like a delay when you’re eager to get the project moving, and some vendors offer to skip a detailed in-person assessment in favour of a quick remote estimate based on generator specs alone.

The real consequence. Exhaust geometry, chimney height, mounting space, and existing pipe diameter all affect how well an RECD fits and performs once installed. A unit sized or positioned based on generic specs rather than your actual site frequently runs into the exhaust backpressure problems we cover in detail in our backpressure guide, sometimes not becoming obvious until weeks after installation.

The fix. Insist on a proper technical assessment, in person where possible, before fabrication begins. It adds a few days to the front of your installation timeline, and it’s time well spent.

Mistake 3: Not Confirming the Capacity Band Match

Why it happens. RECD type approval is granted for kVA bands, not exact capacity figures, and it’s easy to assume “close enough” is fine when comparing your generator’s rating against a certificate’s stated range.

The real consequence. A unit approved for one band installed on a generator outside that range may not perform to its tested specification, and more importantly, the installation may not actually be defensible as CPCB-compliant during an inspection, since the approval simply doesn’t cover that capacity.

The fix. Check this explicitly before ordering, not after. Our test certificate reading guide explains exactly where to find the stated capacity band on your paperwork and how to confirm it against your generator’s actual rating.

Category Two: Mistakes Made During Physical Installation

Mistake 4: Poor Mounting and Incomplete Exhaust Sealing

Why it happens. Under time pressure on installation day, particularly when a crew is trying to finish within a single shift, sealing and mounting work can get rushed, especially on joints that are hard to access.

The real consequence. An improperly sealed exhaust joint leaks gas at the connection point rather than routing it fully through the RECD’s filtration path, which undermines the emission reduction the unit is supposed to deliver and can also create a safety issue depending on where the leak occurs.

The fix. A careful installer checks every joint for a complete seal before considering the job done, and this should be visually and physically verified, not assumed. If you’re present for the installation, ask the crew to walk you through the sealed connections before they close up the work area.

Mistake 5: Ignoring Manufacturer Backpressure Limits During Fitting

Why it happens. Sometimes an installation crew works around a site constraint (an awkward pipe run, a tight mounting space) with a workaround that technically fits the unit but pushes exhaust backpressure closer to, or past, the engine manufacturer’s specified limit.

The real consequence. Excessive backpressure makes the engine work harder to expel exhaust gas, which can reduce power output, increase fuel consumption, raise exhaust temperatures, and in more serious cases contribute to turbocharger stress or engine damage over time. This is one of the most consequential mistakes on this entire list, and it’s covered in full detail in our exhaust backpressure guide.

The fix. Backpressure should be measured and confirmed within specification as part of the commissioning process, not assumed correct because the unit physically fits. If your vendor doesn’t mention a backpressure reading as part of their standard commissioning step, ask for one directly.

Mistake 6: Skipping the Commissioning Test Run

Why it happens. By the time physical mounting is finished, everyone involved, the crew and the facility, is often ready to call the job done. A full test run under actual load takes extra time that feels unnecessary when the unit visibly looks correctly installed.

The real consequence. A unit that looks correctly mounted can still have an issue that only shows up once the generator is running under real load: a leak, an unexpected backpressure reading, or a fault in an electrical or sensor connection. Skipping this step means finding out about a problem later, often at a worse time, than during a controlled test.

The fix. Treat the commissioning test run as a mandatory final step, not an optional extra. This is part of a properly completed installation, not a bonus service, and it’s worth confirming with your vendor upfront that it’s included as standard.

Mistake 7: Leaving the Job Without Complete Documentation

Why it happens. Paperwork sometimes trails the physical work by days, and it’s easy for an installation to be treated as “done” once the crew packs up, even though the compliance file isn’t actually complete yet.

The real consequence. A generator with an RECD physically fitted but no corresponding installation certificate or updated compliance paperwork is not in a defensible position if a pollution control board inspection happens in that gap. Our DG set sealing post covers what’s actually at stake when documentation and physical compliance don’t line up.

The fix. Don’t consider the project closed until you have the installation or compliance certificate in hand, matching the unit that’s actually fitted. If you’re unsure what a complete document should even contain, our verification guide covers exactly what to check for.

Category Three: Mistakes Made After Installation

Mistake 8: Neglecting the Ongoing Maintenance Schedule

Why it happens. Once the compliance box feels checked, RECD maintenance is easy to deprioritise, especially since a filter that’s beginning to load up with soot doesn’t announce itself the way a mechanical failure does.

The real consequence. A neglected RECD gradually loses filtration effectiveness and can develop the same backpressure problems described in Mistake 5, except now caused by accumulated soot rather than a fitting error. Left unaddressed for long enough, this can shorten the unit’s working life and put your compliance status at risk during a future inspection.

The fix. Follow the cleaning and regeneration schedule appropriate to your unit and usage pattern, covered in detail in our RECD maintenance guide, and treat an annual maintenance contract as a real budget line, not an optional add-on.

Mistake 9: No On-Site Awareness or Basic Monitoring

Why it happens. Once installation is complete, the RECD often becomes nobody’s specific responsibility day to day, especially at facilities where generator oversight is informal or spread across whoever happens to be available.

The real consequence. Early warning signs, unusual exhaust smoke, a change in engine sound, a noticeable drop in power output, often go unnoticed for weeks when no one is specifically watching for them, turning a minor issue into a bigger one by the time it’s caught.

The fix. Assign clear ownership of basic generator and RECD awareness to a specific person or role, even informally, and keep a simple running log of hours and any observed changes. This doesn’t need to be elaborate to be useful.

Mistake 10: Delaying the Compliance Paperwork Filing

Why it happens. Even after the installation certificate is in hand, some facilities treat filing or updating records with the pollution control board as a lower priority than day-to-day operations, especially if no inspection is imminent.

The real consequence. If a routine or complaint-triggered inspection happens before your records are formally updated, you may find yourself explaining a gap between what’s physically installed and what’s on file with the authority, which is a worse conversation to have than simply filing promptly would have been. Our DG set sealing post covers how these situations tend to unfold in practice.

The fix. Treat the paperwork filing step as part of the installation project itself, with its own deadline, rather than an administrative afterthought to get to eventually. If your vendor handles filing on your behalf, confirm in writing when it was actually submitted, not just promised.

Mistake 11: Assuming One Emission Control Technology Fits Every Situation

Why it happens. Once a facility has heard of RECD, it’s tempting to assume it’s automatically the right and only choice for every generator on-site, without checking whether a different approach might suit a particular unit’s usage pattern better.

The real consequence. Installing RECD on a generator where a different technology, or in some cases a straightforward replacement, would have been the more sensible fit isn’t exactly a “mistake” in execution, but it can mean paying for and living with a solution that isn’t ideal for that specific machine’s duty cycle. Our RECD vs DPF comparison is worth reading before assuming the decision is automatic.

The fix. Have the conversation about which technology actually fits each generator’s specific situation before ordering anything, rather than defaulting to whatever the last vendor you spoke to happened to sell.

A Short Checklist You Can Hand to Any Vendor

If you’d rather work from a simple checklist than reread all eleven mistakes before your own installation, this condensed version covers the highest-value checks at each stage.

Before you sign anything: has the vendor shown you their type approval and test certificate, and does the stated capacity band actually cover your generator? Has a proper site survey been scheduled, not just a remote estimate based on nameplate specs alone?

On installation day: is someone available to confirm every exhaust joint is fully sealed before the crew leaves? Will a backpressure reading be taken and shared with you as part of commissioning, and will there be an actual test run under load before the job is called complete?

Before the crew leaves site: do you have, in hand, the installation or compliance certificate, not just a verbal assurance it’s coming? Does it correctly identify your specific generator and the RECD unit that’s actually been fitted?

In the weeks after: has an annual maintenance contract been agreed and scheduled, not just mentioned as available? Has someone at your facility been given clear, even if informal, responsibility for noticing early warning signs?

None of these questions require technical expertise to ask. They simply require asking them at the right stage, before the work is considered finished, rather than after something has already gone wrong.

What Fixing These Mistakes After the Fact Actually Costs

Catching a mistake early is always cheaper than discovering it later, and it’s worth being honest about the gap between the two.

Mistake Category	Cost If Caught Before Installation Finishes	Cost If Discovered Later
Wrong vendor or weak documentation	A few extra days comparing vendors properly	Re-verification, possible re-certification, and lost trust in a paperwork trail already in your compliance file
Site survey shortcuts, capacity mismatch	Delay of a few days for a proper assessment	Refitting or replacing a poorly matched unit, plus the original installation cost already spent
Mounting, sealing, or backpressure errors	Corrected same day during commissioning	Engine strain over months before a problem is noticed, potentially a larger repair bill
Skipped commissioning test	A few extra hours on installation day	An unknown fault surfacing during actual operation, often at an inconvenient time
Missing documentation	A follow-up call to the vendor	Exposure during an inspection, with limited ability to prove compliance quickly
Neglected maintenance	Routine, budgeted AMC cost	Reduced filter life, possible premature unit replacement, and renewed backpressure risk

The pattern is consistent across every row: nearly everything on this list is inexpensive to prevent and considerably more expensive, in money, time, or compliance risk, to fix after the fact.

Frequently Asked Questions

Which of these mistakes is the most serious? Ignoring backpressure limits during fitting (Mistake 5) tends to have the most serious downstream consequences, since it risks actual engine performance and longevity, not just paperwork or compliance status. That said, incomplete documentation (Mistake 7) is the most common cause of compliance trouble during an actual inspection, so both deserve serious attention.

Can these mistakes happen even with a reputable, CPCB-approved vendor? Yes, particularly the site-survey and commissioning-related mistakes, which are more about process discipline on a given job than about a vendor’s overall credentials. A reputable vendor with a rushed crew on a particular day can still make these errors, which is why it’s worth staying involved as the customer rather than assuming a good vendor name guarantees a flawless installation every time.

How would I know if my existing installation already has one of these problems? Watch for the specific consequences described above: unusual exhaust smoke or smell, a noticeable change in generator performance or fuel consumption, or simply an incomplete compliance file when you go looking for it. If in doubt, a professional inspection covering backpressure readings and a documentation check is a reasonable step, whether or not you used our team for the original installation.

Is it worth being physically present during installation to catch these mistakes as they happen? It can be, particularly for Mistakes 4 through 6, which are all things a reasonably attentive non-expert can at least partially observe (proper sealing, a completed test run, a stated backpressure reading). You don’t need to be a technician to ask the crew to walk you through what they’ve checked before they leave.

What should I do if I discover a documentation gap after the fact? Contact your original vendor first and ask for the missing paperwork directly. If that doesn’t resolve it, our verification guide covers how to escalate a documentation problem, and our team is available through the contact page if you’d like an independent assessment of an existing installation.

Do these mistakes apply the same way to a multi-generator site as they do to a single unit? The same eleven mistakes apply, but a few carry higher stakes at multi-generator sites simply because of scale. A capacity band mismatch (Mistake 3) or a backpressure error (Mistake 5) repeated across several units, rather than caught once, multiplies both the risk and the cost of correcting it later. If you’re coordinating several installations at once, it’s worth having one person accountable for confirming each unit individually against this list, rather than assuming a check done on the first generator automatically holds for the rest.

Are these mistakes specific to RECD, or do they apply to emission control retrofits generally? Several of them, particularly the vendor-selection, documentation, and maintenance-related mistakes, apply broadly to almost any emission control retrofit, not just RECD specifically. The backpressure and exhaust-sealing mistakes are more specific to devices mounted inline on the exhaust path, which does include RECD as well as some comparable technologies.

The Short Version

Eleven mistakes, three stages, and almost all of them share a common root cause: something got rushed under time or cost pressure. Choose a vendor on documented credentials rather than price alone, insist on a proper site survey and a real commissioning test, and don’t let maintenance or paperwork quietly lapse once the installation crew has left. A correctly installed and properly maintained RECD is a genuinely low-drama piece of equipment. Most of the horror stories facility managers eventually share trace back to one of the shortcuts above, taken once, early on, and compounding quietly until an inspection or a performance problem forces the issue. For the fuller picture of how RECD compares to other emission control approaches once you’re confident your own installation is done right, see our RECD vs DPF comparison, and check the current emission regulations to confirm exactly what your installation needs to satisfy.