Water & glycol coils
Hot-water coils heat the airstream; chilled-water coils cool it. Record the actual fluid and glycol concentration as well as the flow and temperatures.
Open fluid worksheetTillman coil resources
Measure with confidence. Replace with the right coil.
Commercial replacement coils start with a clear picture of the existing equipment and the job it needs to do. Use our measurement guides and worksheets, then bring your project to Tillman & Associates.
Replacement coils · South Texas
A good match needs more than height and width
Record the finned face, overall casing, headers, connection locations and airflow direction. Include the operating conditions when available so we can review both fit and performance.
Tillman illustration · dimensions and arrangement vary by coil.
Start with the coil application
Steam heating coils
Steam coils heat air as steam condenses. Record the steam supply, condensate return and installation orientation for review.
Open steam worksheetDX evaporator coils
Evaporator coils use refrigerant to cool air. Refrigerant, circuit arrangement and distributor details belong with the physical measurements.
Open evaporator worksheetCondenser & heat-reclaim coils
Condenser coils transfer refrigerant heat into an airstream. Document each section and its hot-gas and liquid connections.
Open condenser worksheetCoil basics
Fit and performance are different checks
Finned face vs. casing
Fin height and finned length describe the active face. Casing dimensions, flanges, headers and projecting connections determine the space needed to install the coil.
Rows, fins and circuiting
Record rows deep, fins per inch and tube size separately. Circuiting is the fluid path through the tubes; matching the envelope alone does not establish capacity or pressure drop.
Flow and temperature
A performance review needs airflow and entering air conditions plus the fluid or refrigerant conditions. Identify the glycol type and concentration basis; keep operating and design pressure separate.
What to send for a replacement quote
- Equipment nameplate and existing coil tag or drawing.
- A completed measurement worksheet, including units.
- Photos of the full coil, both ends, connections, vents and drains.
- Known duty, airflow, fluid flow, temperatures and pressure limits.
- Quantity, job location, access restrictions and required date.
Unknown details? Mark them unknown and send what you have. We will help identify the next measurement.