By task
Prepare a replacement enquiry using the nameplate, drawing or site measurements. Check the fit, connection orientation and operating duty before agreeing the replacement.
A replacement coil must fit the equipment and perform its thermal duty. Record the core, bends, headers and mountings, then distinguish reusable equipment accessories from the items being replaced.
Read the following parts as a typical CuAl coil anatomy. Actual circuiting and accessories vary with the equipment and duty.
Heat-transfer core
Channels carrying the working fluid through the finned core.
Separate the fluid from air and conduct heat to or from the fins.
Core element of a CuAl finned-tube coil.
Leak traces, corrosion or visible damage.
Heat-transfer core
Thin metal sheets in thermal contact with the tubes.
Enlarge the surface exchanging heat with air.
Core element; spacing and profile vary.
Dirt deposits, damaged passages or corrosion.
Depends on circuit and construction
Curved tube sections connecting successive passes.
Turn the flow and form the coil circuit.
Layout-dependent; an integral hairpin and a separate return bend are different constructions.
Damaged bends or leakage at joints.
Depends on circuit and construction
Manifolds linking multiple tube circuits to external connections.
Distribute or collect the working fluid.
Arrangement depends on circuiting; headers are not identical to a DX distributor.
Corrosion, joint damage or leak traces.
Depends on circuit and construction
End plates and supporting casing around the core.
Support the core and provide mounting interfaces.
Common; casing styles include end-plates-only constructions.
Deformation, corrosion or damaged mountings.
Where required by the duty
A device feeding the parallel circuits of a DX evaporator.
Divides refrigerant between the selected coil circuits.
DX-specific where used; the expansion valve has a separate function.
Damaged small tubes or leakage signs require diagnosis.
Where required by the duty
A collection surface beneath a coil that produces condensate.
Collect and remove condensed water.
Needed for wet cooling; often part of the equipment section.
Standing water, deposits, corrosion or leakage.
Where required by the duty
A downstream separator for droplets carried by the airflow.
Intercepts droplets and lets collected water drain.
Conditional on carryover risk and equipment design; not every cooling coil has one.
Contamination, damage or water carryover.
Condition signs help identify what needs inspection; they do not identify the fault by themselves. Service methods and intervals follow the equipment manual.
A replacement enquiry starts with the existing failure as well as the required duty. Attach overall and close-up photographs, the nameplate, the damage location and the operating history. Mark tubes, fins, return bends, headers and casing separately so that a fin defect is not mistaken for a fluid-circuit defect.
Ask for a comparison of the feasible restoration scope and a new section: expected fit and duty, work and inspection scope, downtime and documents. The decision needs an assessment of the actual unit; appearance or one overall dimension is insufficient.
Record the manufacturer, model and available markings without guessing unclear characters. An equipment overview establishes context; photographs of the coil and connections identify the replacement subject. If the specification and installed product differ, retain both sources and flag the discrepancy. It needs assessment rather than choosing whichever version is more convenient.
A measurement is useful when its reference points are clear. Distinguish the finned section from overall dimensions, the mounting frame and projecting connections. Identify airflow direction and the viewing position; left and right can otherwise be ambiguous. An annotated photograph helps align the descriptions, but does not replace a verified drawing.
Matching the mounting arrangement is only one part of the assessment. The coil function, working medium, available operating data and equipment constraints are also needed. Identify which components will remain, such as the frame, casing, fans, pipework or other assemblies. The preparation produces an agreed context for assessment, not confirmation of interchangeability or installation suitability.
FROM THE UPGR LIBRARY
These archive examples explain how face dimensions, overall dimensions and connections are recorded. They are not manufacturer-approved drawings for selection or manufacture. Dimensions belong only to the illustrated examples; your model and order require a separately agreed drawing.
The example states 1280 × 690 mm. This is not the full envelope with frame and projecting connections.
750 ± 5 mm and 136 ± 3 mm are dimensions of this example. Check their extension lines and reference surfaces before comparing an opening.
The drawing shows Ø25, but connection type, position, function and viewing direction must also be agreed. Do not derive missing coordinates by measuring pixels.
DRAWING AND SPECIFICATION
This educational schematic helps you read dimensions and prepare measurements. The manufacturer drawing must also identify the configuration, materials, tolerances and revision.
Full width, height and depth including projections. Check the opening and the path needed to remove the coil.
Dimensions of the finned block only. Do not substitute the frame or AHU casing dimensions.
Offsets from one stated datum. Each connection also needs its own position, diameter, connection type and function.
REVIEW THE RESULT
Identify airflow direction and viewing side on every view. Reference connections and fixings to consistent datums; left and right without a stated view cannot rule out a mirrored arrangement.
Compare the overall envelope, finned face, projecting connections and fixing holes. Include the access opening and removal path, and distinguish measured dimensions, documented values and unresolved dimensions in the review.
Provide the working fluid, known duty and reason for replacement. Before ordering, compare the proposed drawing and selection data with the original assembly; make the matches, deviations and retained components explicit.
Compare the recovered series by nominal opening, frame and casing depth. Each model has its own drawing and render; final suitability depends on the operating duty and connections.
SELECTION INPUTS
Define operating conditions first. The input checklist above describes the data needed for this application. The enquiry form adapts to the selected duty; it does not calculate a coil rating.
Add the equipment nameplate, photographs, overall and finned dimensions, airflow direction, connections and access constraints. Matching the envelope alone does not confirm performance or compatibility.
Separate fixed interfaces from dimensions open to change. Attach the current drawing revision, duty points, material requirements, quantity and acceptance criteria. Manufacturing feasibility is confirmed for the specific specification.
Final performance, materials and compatibility require a project-specific selection and an approved drawing.
Yes. Available photographs and markings can start identification. Missing information is recorded separately; beginning an enquiry does not mean there is already enough evidence to confirm a replacement.
No. Connections, construction, working medium and operating conditions also matter. Overall dimensions establish only part of the installation geometry and do not replace a combined technical assessment.
State any requirement for the part's origin in the enquiry. An original part, manufacture to documentation and another replacement option are distinct proposals; similar appearance does not confirm any of them.