By task
A new coil for a specified duty or a configuration made to an agreed drawing. Define the installation constraints, materials and results to be confirmed before manufacture.
Custom manufacture defines the core, circuiting, connections and mounting interfaces together. The drawing also distinguishes supplied accessories from the bare coil; materials and dimensions belong to the agreed specification.
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.
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
State the drawing number and revision, airflow direction and dimensional datums. Record the envelope, finned face, fixings and connection positions separately, and explicitly agree mandatory dimensions and permitted tolerances.
Link the drawing to the working fluid, design duty and component-level material specification. Identify what the manufacturer may change during selection and what must remain fixed; reflect changes in the agreed revision.
Before manufacture starts, agree the supply scope, required checks and documents demonstrating compliance with the specification. The expected package comprises an accepted drawing, specification and agreed verification results; the selected manufacturer confirms the applicable scope.
For new equipment, start with the coil's intended function and project constraints. If the enquiry is based on an old coil, photographs or a sample, replacement identification is needed first. Separating these cases clarifies which parameters have been specified by the designer and which still need to be established from the existing product.
The drawing, duty and assembly description must refer to the same construction. Record dimensions, connections, materials and constraints with their source and document revision. Separate mandatory requirements from preferences. Where a parameter is to be determined during selection, state that explicitly rather than filling an unknown value from a similar-looking product.
IN PRACTICE
Separate the interfaces that cannot change from parameters that can be optimized and data still to be confirmed.
Opening, connections, duty and acceptance criteria.
Permitted geometry and material alternatives.
Unknown inputs, source drawing revision and quantity.
The generic coil image is an illustration of the product class, not a photograph of a completed custom order.
For a production enquiry, state the quantity, intended use and expected documentation and verification scope. The enquiry itself does not establish material availability, manufacturing capability or production repeatability. The specific construction, supply boundaries and verification method need to be agreed before a decision. Manufacturing to documentation does not imply official OEM status.
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.
No. A manufacturer must confirm the feasibility of the specific geometry and duty. A general enquiry, or limits documented for another product, does not provide that confirmation.
Start with the replacement process: identification, photographs, available markings and measurements. Documentation can then be developed through clarification; a physical sample alone does not make the specification complete.
No. A drawing defines product requirements. Origin, official status and compatibility are separate claims, each requiring its own supporting evidence.