How to Select The Right Replacement Or Retrofit Coil
For Your Application

How to measure coils

See PDF and go to page 3 and fill out as much data as you have available to complete form. Send form with appropriate coil drawings from pages 4 thru 8 to Coil Company via FAX # 610-251-0805.

We need information from you to adequately provide budget or exact pricing and then specific information to actually fabricate the coil(s). We have a master replace¬ment coil form that needs to be completed. The infor-mation requested can be obtained from the front views and connection arrangement views shown on the following pages.

  • A. We need the Unit Manufacturer, Unit and Coil Model Number
  • B. Coil Type (Std. Steam, Steam Distr., Hot Water, Chilled Water, DX Cooling or Condenser) and tube diameter, connections on same or opposite ends ? and the quantity.
  • C. Face View and Coil Connection View arrangements - Face View is either exposed or concealed headers and select coil closest to E1 thru E6 or C1 thru C6. We do not show the actual coil connection stubs for ease of selection - Coil connection arrangement is by looking at connection end (both ends if opposite end). Select the view closest to your coil to be replaced.
  • D. Rows, Fins per inch, Number of tubes in each row - Rows are rows of tubing in direction of airflow. Usually one row to eight rows but can be more. Fins per inch is just number of fins within one inch and number of tubes high is the number you count in one row. An example would be a 5/8” Tube Coil with a fin height of 30”. There are 20 tubes/row.
  • E. Selection of finned area (FH x FL), Casing Height x Casing Length x Casing Depth is very important. FH x FL is finned area where air passes through coil, casing dimensions are always outer frame dimen¬sions. Casing Height is always perpendicular to tubes, Casing Length in direction tubes run and casing depth is always measured in direction of air flow.
  • F. Overall Length (OL) and Stub Length (SL) is very important because the “OL” might be the most important length dimension measured since it is usually fitting snug within the walls of the unit. Always remember that “OL” should always be longer than “CL”. Stub Length is just the distance of the connection stub from header out to end including thread. G. Connection sizes are easy but connection types are usually MPT, FPT, Sweat or Flanged.
  • H. Flange sizes above and below (TB) and Flanges at connection and return bend ends (EF) are important to properly build channels so that coil can fit into unit. Remember FH + TB + TB = CH (Casing Height) and FL + EF + EF = CL (Casing Length).
  • J. This is the connection location area. Connections are always measured from the very edge (top or bottom of coil casing) to centerline of connection. “A” is always bottom to lowest connection, “B” is always from top to highest connections and “C” is always the horizontal measuring between connections or from side of coil casing.
  • K. Construction of coil is important because we need to know to make sure special materials are used when required. If you can’t tell, then give us temperature/pressure ratings and corrosive data, in lieu of actual construction.
  • L. This section is actually giving us the circuitry on the coils. Determining the circuitry is as simple as counting the number of tubes fed from each header.
  • M. Comments: We need any information like coatings, application, etc., that might help us help you. We do not want to duplicate your problem.

Coil Replacement
Guide