Capillary Tubing Info
Factors Affecting Refrigerant Flow (Diameter & Length)
Capillary Tubing - Length Conversion Chart
This conversion chart enables the user to translate the recommended length of tube diameter into sizes stocked by J/B. In using the chart it is recommended that conversions be made using factors within the unshaded area.
Conversion Chart - Purpose
The Capillary Tube Length Conversion Chart was developed to enable users of capillary tubing to use the standard tubing sizes which are available through Refrigeration Jobbers everywhere.
While many original equipment manufacturers and condensing unit manufacturers recommend specific lengths and diameters of capillary tubing for their units, these tube sizes are not always readily available except of special order.
This conversion chart enables the user to translate the recommended length into that of a tube diameter that can be quickly obtained. In using the chart, it is recommended that conversions be made using factors within the unshaded area. In addition, it is highly recommended that the minimum length of capillary used be 5 feet.
Recommended capillary tube lengths for each circuit in an air conditioner evaporator where R-22 is the refrigerant. All recommendations must be considered approximate and variations may arise in actual field applications.
Window air conditioners normally have 1 circuit and the recommended cap tube can be read directly from the chart. Larger units have 2 or more circuits in the evaporator. Where this is the case, simply divide the total BTU rating of the unit by the number of cap tube circuits to obtain the BTU/CIRCUIT rating of each individual cap tube.
Air conditioner is rated at 27,000 BTU and has 3 cap tubes connected to the evaporator. Divide 27,000 by 3 = 9,000 BTU/Circuit. From the chart, this would call for .075 I.D. (TC-75) 72 inch long.The length and I.D. of any cap tube may be adjusted to a more readily
available size by using the conversion chart.
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