PRECISION COILS

The Precision Coils hydronic duct coils supplied by 3G Electric cover flow capacities from 0.9 gpm to 5.7 gpm. Specific models include 0.9 gpm (W101612N), 2 gpm (SP102612N), 2.8 gpm (W102912N), 3.8 gpm (W1021212N), and 5.7 gpm (W1011824N). Flow capacity is tied to the coil's fin dimensions, number of feeds, and number of rows. For a given entering water temperature and flow rate, the leaving water temperature will vary based on the air-side conditions and coil geometry. Consult the individual model datasheet for exact performance at your design conditions.

Row count affects both heat transfer capacity and pressure drop. A 1-row coil, such as the W102912N (1 feed, 1 row), provides a single pass of water through the coil and is typically used where moderate heating or cooling capacity is required with lower water-side pressure drop. A 2-row coil, such as the W1011824N (2 feeds, 2 rows), provides additional heat transfer surface and is suited to higher capacity requirements or lower entering water temperatures. Selection should be based on the required leaving air temperature, available water flow rate, and allowable pressure drop on both air and water sides.

The Precision Coils hydronic duct coils listed by 3G Electric show entering water temperatures of 55°F with leaving temperatures ranging from 76°F to 112.1°F, depending on the model and flow rate. For example, the W101612N has a 55°F entering and 76°F leaving temperature at 0.9 gpm, while the W1021212N has a 55°F entering and 112.1°F leaving temperature at 3.8 gpm. These values are specific to the published test conditions. Actual performance will vary with airflow, entering air temperature, and water flow rate. Use the manufacturer's selection software or datasheet for precise performance at your conditions.

Yes. Precision Coils hydronic duct coils are designed for both heating and cooling duty, depending on the temperature of the water supplied to the coil. When supplied with hot water, the coil adds heat to the air stream; when supplied with chilled water, the coil removes heat. The same coil model can often be used for either application, provided the water temperature and flow rate are within the coil's design limits. For cooling applications, condensate management must be considered, and a drain pan may be required. Verify that the coil casing and materials are suitable for the expected entering water temperature and any condensation that may form.

To select a Precision Coils hydronic duct coil, gather the duct dimensions at the installation point, the required airflow rate, the entering air temperature and humidity, the desired leaving air temperature, the available water flow rate and temperature, and the allowable pressure drop on both air and water sides. Match the coil casing dimensions to the duct size, ensuring the fin dimensions and casing height, width, and depth fit the available space. The number of feeds and rows, flow capacity, and entering/leaving water temperatures from the datasheet will guide the final model choice. 3G Electric can provide dimensional drawings and performance data for verification.

Precision Coils hydronic duct coils typically use copper tubes with aluminum fins for the heat transfer surface. Casings are generally constructed from galvanized steel. Headers and connections may be copper or brass. Exact materials can vary by model and should be confirmed on the specific datasheet. For applications involving corrosive environments or special fluids, alternative materials may be available. Always verify compatibility of the coil materials with the system water quality and any glycol concentration to avoid premature corrosion or fouling.