Understand the Ductwork Guidelines for Vertex Ducted Central Split (DYC-18) SystemsUpdated 13 days ago

Introduction

This article explains the ductwork guidelines for Vertex Ducted Central Split (DYC-18) systems. 

Guidelines

Design the Duct System

Design the duct system within the external static pressure range of the device's designed operation. Adequate airflow in the system is important, so ensure that the following are included in the total resistance:

• Supply and return ductwork.
• Grid.
• Special filter screen. 
• Accessories. 

In addition, design the ductwork according to the American Air Conditioning Contractors Association "ACCA" manual "D" residential air conditioning design and equipment selection in winter and summer. If the ductwork contains flexible air pipes, ensure that the design takes into account of the pressure drop information (straight line length plus all turns) shown in the ACCA manual. 

Insulation

Insulate the metal ductwork that will operate in the conditioned space and cover it with a moisture-proof layer. 

If the construction and installation of the ductwork is carried out according to SMACNA glass fiber duct construction standards, the fiber duct system can be used. 

The ductwork must meet the U/L standard 181 test of Class I air duct by the National Fire Protection Association of America. Also, check the local ductwork regulations and insulation requirements. 

Connection

Connect the air duct connector to the 3/4-inch flange on the equipment. Install a flange around the air outlet. 

If the duct connector has an elbow, its size must not be smaller than that of the flange on the outlet of the device. 

If the front flange of the return duct is connected to the fan casing, it must not be screwed into the area where the power cord is located. Drill bits or sharp screw tips can damage the insulation of the equipment's internal wires. 

Fasten

Fix the outlet and return ducts to the flanges of the device, then connect the ducts to the device with adhesive tape as needed to prevent air leakage. 

Use appropriate fasteners suitable for the type of duct being utilized. 

Safety Notes

• The on-site ductwork must comply with the National Fire Protection Association NFPA 90A, NFPA 90B, and any other applicable local ordinances. 
• Do not connect the return ductwork to any other heat-producing equipment, such as a mantelpiece, stove, etc. This could lead to fire, carbon monoxide poisoning, explosion, personal injury, or property damage.