Steam distributing (no u-bends, designed for better freeze protection).

Accessories required? Hot gas bypass, TXVs, accumulators, filter driers, sight glasses, solenoid valves.

Condensing unit information (capacity, model number, staging, circuiting).

Glycol type and percentage (none, propylene, ethylene, percentage 0-50%).

Step #2 Gather all the design information:

Pitched casing if steam coil (not critical for estimating).

Header and connection sizes (not critical for estimating).

Flange sizes (Typical: 0″ – 2″ – not critical for estimating).

Circuiting and connections (single or dual circuit, intertwined or face split, left hand or right hand, same end or opposite end connections- not critical for estimating price).

Coil depth (not critical for estimating, but typical is 3″-12″).

Fin length (typical max length is 240″).

More than 60” coils are typically stacked)

Fin height (typical max height is 60”.Number of Rows (1 or 2 rows typical for heating, 3-8 rows typical for cooling).Step #1: Gather the physical coil dimensions (more info will be needed at coil verification measure) The number of circuits is chosen to provide optimum heat transfer and reasonable refrigerant velocity and pressure drop so as not to trap any oil in the coil tubing.Here is a step-by-step process for replacing a custom coil and A) Making sure it fits and B) Making sure it works. Due to the huge variety of coil input conditions, the coils calculation and selection is optimally done based on a fully wetted coil by selection software integrated in the unit selection software to match the required conditions.ĭirect expansion coils are equipped with a properly - sized expansion valve and distributor to ensure equal refrigerant fed to all circuits. All coils are factory tested at no less than 300 psig air pressure underwater. The standard number of fins per inch are 10, 12, 14 FPI (fin pitch 3.3, 2.5 2.1, and 1.8).

The cooper tubes are mechanically expanded into collar of corrugated aluminium fins to provide a continuous compression bond over the entire finned length for maximum heat transfer rates.

As a standard, coils are manufactured from seamless copper tubes of OD 9.52mm (3/8inch). All coils designed to deliver their respective duties at optimum performance at all design conditions and to meet a wide range of applications and requirements.

Dx coil selection software