By equipment
Establish the air condition entering this particular coil and the required condition leaving it. Then match the duty and mounting arrangement to the supply air unit.
A supply air unit may treat outdoor air, mixed air or air leaving heat recovery. The coil's entering temperature therefore need not equal the outdoor temperature. Show the order of any filter, heat-recovery device, heater and cooler, and mark the section concerned.
IN PRACTICE
Two archive service illustrations show the relation between the casing, coil and removable components.
The opened side exposes the coil and its connection area.
The partially withdrawn view makes access relevant; actual clearance and temporary supports require checking.
Confirm the frame, seals and connections for the real unit.
These are separate service presentations, not operating units or a step-by-step replacement procedure.
Heating requires the entering air condition and available fluid temperatures. Cooling additionally requires humidity and any dehumidification target. A water coil and a DX coil need different working-fluid data. Several seasonal duties should not be reduced to one capacity value without their operating conditions.
Distinguish fin-pack dimensions, the outer frame and the casing opening. On one defined view, mark airflow, connection side, fixings and the coil-removal route. For a cooler, include the drain pan and drainage. These details make the supply-coil enquiry more specific than the general AHU designation.
The coil check includes allowable air and fluid pressure drops and coordination with piping and controls. Outdoor-air treatment also needs an explicit winter duty and freeze-protection response. A pump, valve or sensor belongs to the supply only when included in the agreed arrangement and component list.
REVIEW THE RESULT
Tie temperature, humidity and airflow to the coil location after any mixing or recovery. Document winter and summer duties separately; outdoor temperature is not always the coil entering temperature.
Compare all three sets of dimensions and connection positions on one agreed view. Define the connection side relative to the shown airflow direction and separately check the space needed to remove the coil.
Agree the drain pan and drainage for a cooler, and winter duty and protection response for a water heater. Check pressure drops and the piping scope for the selected function without inferring supplied components from an image.
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.
Only if the air has not been conditioned upstream. Air mixing or heat recovery changes the entering condition, so the actual unit arrangement is needed.
The frame defines the mounting envelope; the fin pack is the active heat-transfer section. Matching one set of dimensions does not establish both installation fit and thermal performance.
It is a separate scope item. State whether the enquiry covers the coil alone, a piping assembly or compatibility with existing equipment.