This article provides an overview of the installation process for ducted ceiling concealed indoor units.

<h2 id="isPasted"><u>Introduction</u></h2><p>This article provides an overview of the installation process for ducted ceiling concealed indoor units.&#xA0;</p><p>Each section in this article represents a step in the installation process. Click the link in each section to learn about that specific step.&#xA0;</p><p>This article is for the following system:&#xA0;</p><p><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ducted-ceiling-concealed" target="_blank" rel="noopener noreferrer">Quantum Ultra Ducted Ceiling Concealed (RYT-24)<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026022416-09f7c580-9274-4798-8c81-67037029a99f-ryt24_idu.jpg" style="width: 400px;" class="fr-fic fr-dib fr-bordered"></a></p><h2 id="select-an-ideal-location-for-installation"><u>Select an Ideal Location for Installation</u></h2><p>Before beginning, we recommend understanding how to select an ideal location for installing the indoor unit.&#xA0;</p><p>Click this <a href="https://help.pioneerminisplit.com/en-US/ryt24-idu-installation-location-3634829" target="_blank" rel="noopener noreferrer">link</a> for information.&#xA0;</p><h2 id="1-install-the-hanging-bolts"><u>1. Install the Hanging Bolts</u></h2><p>Begin by installing the hanging bolts for the indoor unit. There are different mounting methods available for the hanging bolts.&#xA0;</p><p>For more information, read this <a href="https://help.pioneerminisplit.com/en-US/ryt24-install-hanging-bolts-4223418" target="_blank" rel="noopener noreferrer">article</a>.&#xA0;</p><h2 id="2-suspend-the-air-handler-unit"><u>2. Suspend the Air Handler Unit</u></h2><p>After installing the hanging bolts, suspend the air handler unit. This step requires attaching the components in a specific order.&#xA0;</p><p>Read this <a href="https://help.pioneerminisplit.com/en-US/ryt24-suspend-air-handler-4223421" target="_blank" rel="noopener noreferrer">article</a> to learn more.&#xA0;</p><h2 id="3-set-up-the-condensate-piping-connections"><u>3. Set Up the Condensate Piping Connections</u></h2><p id="isPasted">Set up the condensate piping connections for the indoor unit. This step includes insulating all drain piping and connections to prevent dew formation and dripping.&#xA0;</p><p>Unlike wall-mounted systems, ducted ceiling concealed systems and other light commercial air conditioners cannot use the flexible drain hoses. In order for the flexible drain hose to be utilized correctly, we recommend routing the included hose through PVC.&#xA0;</p><p>Get more information by clicking this <a href="https://help.pioneerminisplit.com/en-US/ryt24-idu-condensate-piping-4743522" target="_blank" rel="noopener noreferrer">link</a>.&#xA0;</p><h2 id="4-understand-the-best-duct-selection-practices"><u>4. Understand the Best Duct Selection Practices</u></h2><p>This indoor unit supports both rectangular and round duct connections. We do not have specific ducting recommendations as each project and scenario are different.</p><p>Click this <a href="https://help.pioneerminisplit.com/en-US/ryt24-best-duct-selection-practices-4252584" target="_blank" rel="noopener noreferrer">link</a> to learn more.&#xA0;</p><h2 id="5-wire-the-indoor-unit"><u>5. Wire the Indoor Unit</u></h2><p>Connect the electrical wiring and signal cabling to properly wire the indoor unit. The indoor unit requires specific gauge wires, depending on the type of system.&#xA0;</p><p>Click this <a href="https://help.pioneerminisplit.com/en-US/ryt24-wire-idu-4254661" target="_blank" rel="noopener noreferrer">link</a> to get more information on this step.&#xA0;</p><h2 id="6-connect-the-refrigerant-piping"><u>6. Connect the Refrigerant Piping</u></h2><p id="isPasted">After unwinding the copper piping kit, connect the refrigerant piping to the indoor unit. This step requires torquing the protection caps and flange connection to specific measurements.&#xA0;</p><p>Click this <a href="https://help.pioneerminisplit.com/en-US/connect-refrigerant-piping-idu-3624603" target="_blank" rel="noopener noreferrer">link</a> to get more information.&#xA0;</p><h2 id="7-wrap-the-lines--seal-air-gaps"><u>7. Wrap the Lines &amp; Seal Air Gaps</u></h2><p id="isPasted">Finish the installation process by wrapping the lines and sealing the air gaps. Even small gaps can result in air or water leakage.&#xA0;</p><p>Read this <a href="https://help.pioneerminisplit.com/en-US/cyt24-wrap-lines-seal-air-gaps-4223255" target="_blank" rel="noopener noreferrer">article</a> to learn more about this step.&#xA0;</p><h2 id="isPasted"><u>After the Installation is Completed</u></h2><p>We recommend performing a running inspection after the installation is completed. For information on performing the test run, click this <a href="https://help.pioneerminisplit.com/en-US/safety-checks-test-run-3672815" target="_blank" rel="noopener noreferrer">link</a>.&#xA0;</p>

Install Ducted Ceiling Concealed Indoor Units: Getting Started

This article explains how to configure ducted ceiling concealed indoor units for rear air return operation.

<h2 id="introduction"><u>Introduction</u></h2><p>This article explains how to configure ducted ceiling concealed indoor units for downward air return operation.&#xA0;</p><p>The indoor unit comes pre-configured for rear air return, but can be modified for downward air return operation if needed.&#xA0;</p><p id="isPasted">This article is for the following system:&#xA0;</p><p><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ducted-ceiling-concealed" target="_blank" rel="noopener noreferrer">Quantum Ultra Ducted Ceiling Concealed (RYT-24)</a></p><h2 id="steps"><u>Steps</u></h2><p><strong>1. <strong id="isPasted">Rear&#xA0;</strong>Air Return (Factory Default)</strong></p><p>By default, the air return is configured to draw air from the rear of the unit.&#xA0;</p><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012614-256bd9be-efd2-4f95-85b3-d1528d030525-ryt24_rear_air_return_1.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><p><br></p><p><strong>2. Disassemble the Filter and Bottom Panel</strong></p><p>Loosen the screws to remove the mesh filter and filter frame from the rear panel. Then, remove the bottom panel cover by loosening the mounting nuts.&#xA0;</p><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012614-6c1f311b-20b6-4555-993f-75d1c0eb2384-ryt24_rear_air_return_2.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><p><br></p><p><strong>3. Reinstall the Filter for Downward Air Return</strong></p><p>Mount the mesh filter and frame onto the downward (bottom) air return opening. Attach the cover to the rear return opening to seal it.</p><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012614-2dd6172d-95b4-48d5-8ad2-e8cdbeb2c0f2-ryt24_rear_air_return_3.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><p><br></p><p><strong>4. Downward Air Return Configuration Complete</strong></p><p>The unit is now configured for downward air return operation.&#xA0;</p><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012614-67789f9c-4cb2-43c5-b5bf-d928092c08f6-ryt24_rear_air_return_4.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><p><br></p>

Configure Ducted Ceiling Concealed Indoor Units for Rear Air Return Operation

This article explains how to install the hanging bolts for ducted ceiling concealed indoor units.

<h2 id="introduction"><u>Introduction</u></h2><p>This article explains how to install the hanging bolts for ducted ceiling concealed indoor units. The article also provides the mounting methods available for the hanging bolts.&#xA0;</p><p>This is the first step in the installation process for ducted ceiling concealed indoor units.&#xA0;</p><p id="isPasted">This article is for the following system:&#xA0;</p><p><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ducted-ceiling-concealed" target="_blank" rel="noopener noreferrer">Quantum Ultra Ducted Ceiling Concealed (RYT-24)</a></p><p><strong>Note:&#xA0;</strong>The hanging bolts are not included with the system.</p><h2 id="install-the-hanging-bolts"><u>Install the Hanging Bolts</u></h2><p id="isPasted">Use four 3/8-inch threaded hanging bolts and eight washers and nuts to suspend the indoor unit. &#xA0;</p><p>The center-to-center distance between the bolts must match the specifications provided for the unit size.&#xA0;</p><h2 id="mounting-methods"><u>Mounting Methods</u></h2><p><strong>Finished Concrete (Brick or Slab)</strong></p><ul><li>Use the expansion bolts to fix the hanging hooks directly into the concrete.&#xA0;</li><li id="isPasted">Drill to a depth of 1-3/4 to 2 inches (45-50 mm) to ensure secure anchoring.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120519-9acdda98-ea43-402f-896f-b74a8d546465-cyt24_mounting_methods_finished_concrete.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li></ul><p><strong>New Concrete Bricks</strong></p><ul><li>Use one of the following methods to embed the screw bolts:&#xA0;<ul><li>Blade-type insertion</li><li>Slide-in channel insertion</li></ul></li><li>Ensure that the screw bolts are anchored firmly into the embedded steel reinforcements bars.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120519-b5e217b3-6454-4962-a330-aef43ae7bbcc-cyt24_mounting_methods_new_concrete_bricks.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li></ul><p><strong>Steel Roof Beam Structure</strong></p><ul><li>Install the supporting angle steel brackets.&#xA0;</li><li>Mount the hanging bolts through the brackets and secure them as shown below:<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120519-7d5d335b-06d0-4499-af41-ff648fed8625-cyt24_mounting_methods_steel_roof_beam.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li></ul><p><strong>Wooden Construction</strong></p><ul><li>Secure the angle iron across the wooden joints.&#xA0;</li><li>Secure the hanging screw bolts through the channel and into the ceiling structure below.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120519-853cb164-a68a-4f64-aefc-2085f0b66493-cyt24_mounting_methods_wooden_construction.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li></ul>

Install the Hanging Bolts for Ducted Ceiling Concealed Indoor Units

This article explains how to select the installation location for ducted ceiling concealed indoor units.

<h2 id="introduction"><u>Introduction</u></h2><p>This article explains how to select the installation location for ducted ceiling concealed indoor units.&#xA0;</p><p id="isPasted">This article is for the following system:&#xA0;</p><p><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ducted-ceiling-concealed" target="_blank" rel="noopener noreferrer">Quantum Ultra Ducted Ceiling Concealed (RYT-24)</a></p><p>For the different dimensions of this system, click this <a href="https://help.pioneerminisplit.com/en-US/ryt24-dimensions-weights-4382127" target="_blank" rel="noopener noreferrer">link</a>.&#xA0;</p><h2 id="select-the-location"><u>Select the Location</u></h2><p id="isPasted">Before starting the installation, select the positions of both the indoor and outdoors units.&#xA0;</p><p>Position the air handler in the center of the area intended to be air conditioned, ensuring the best air distribution.</p><p>Follow the tolerances depicted in the illustration below:&#xA0;</p><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120215-562d4c6b-d4c7-442e-8ba7-7ee6e8f9151a-ryt24_indoor_unit_installation_location.png" style="width: 800px;" class="fr-fic fr-dib fr-bordered"></p><p>Follow these best practices for selecting the optimal installation location:</p><p><strong>Do Not:&#xA0;</strong></p><ul><li>Install the unit in areas where flammable gases may accumulate (e.g., fuel storage areas, chemical plants).&#xA0;</li><li>Install the system in coastal or seaside locations with salty air exposure (unless the system is specifically treated for corrosion resistance).&#xA0;</li><li>Install the unit in environments containing caustic gases such as sulfur compounds near hot springs or industrial zones.&#xA0;</li><li>Mount the unit in spaces that cannot support its full operational weight such as weak ceilings or unstable walls.&#xA0;</li><li>Install the unit in kitchens or areas heavily exposed to oil fumes, vapors, or grease accumulation.&#xA0;</li><li>Install the unit in areas subject to strong electromagnetic interference such as near factories, radio transmitters, and heavy-duty electrical equipment.&#xA0;</li><li>Install the unit near sources or acidic or alkaline vapors, including industrial cleaners or chemical discharge zones.&#xA0;</li><li>Install the system in tightly enclosed spaces with inadequate ventilation, which may restrict airflow and service access.&#xA0;</li><li>Install the system in high-humidity spaces such as laundry rooms or bathrooms without sufficient moisture control.&#xA0;</li><li>Install the unit in areas with heat sources such as stoves, open flames, or direct exhaust that could affect the unit.&#xA0;</li><li>Install the unit in sites with interferences from outdoor air that could disrupt airflow patterns (e.g., near open windows or vents).&#xA0;</li><li>Neglect proper electrical insulation for the air conditioner-building wiring. Installation must comply with national electrical safety standards.&#xA0;</li></ul><p id="isPasted"><strong>Do:</strong></p><ul><li>Install the unit in a well-ventilated location with sufficient clearance for proper airflow, maintenance, and servicing.&#xA0;</li><li>Install the unit in a site with a flat and stable surface or ceiling capable of bearing the full operational weight of the unit.&#xA0;</li><li>Install the unit in an area with unobstructed air inlet and outlet paths, ensuring balanced air distribution throughout the room.&#xA0;</li><li>Install the unit in a location that allows for a short, direct path for condensate drainage, in accordance with local building codes.&#xA0;</li><li>Install the unit in an area protected from direct sunlight, which could impair performance or overheat the system.&#xA0;</li><li>Install the unit in a position at least 3 feet (1 m) away from antennas, power lines, telephones, security systems, or other electrical / radio interference sources.&#xA0;</li><li>Install the unit in a location that will permit the airflow to circulate evenly throughout the room, avoiding dead zones or drafts.&#xA0;</li><li>Install the unit in a conveniently accessible area for installation and future servicing needs.&#xA0;</li><li>Install the unit in a site where users can be educated on operation and maintenance procedures, such as cleaning filters and using the control system.&#xA0;</li></ul>

Select the Installation Location for Ducted Ceiling Concealed Indoor Units

This article explains how to set up the condensate piping connections for ducted ceiling concealed indoor units.

<h2 id="isPasted"><u>Introduction</u></h2><p>This article explains how to set up the condensate piping connections for ducted ceiling concealed indoor units. This is the third step in the installation process for ducted ceiling concealed indoor units.&#xA0;</p><p id="isPasted">This article is for the following system:&#xA0;</p><p><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ducted-ceiling-concealed" target="_blank" rel="noopener noreferrer">Quantum Ultra Ducted Ceiling Concealed (RYT-24)</a></p><h2 id="drainpipe--insulation-material-requirements"><u>Drainpipe &amp; Insulation Material Requirements</u></h2><ul><li><strong>Drainpipe:&#xA0;</strong>Polyvinyl chloride (PVC) pipe with an 1-1/4-inch outer diameter (32 mm).&#xA0;</li><li><strong>Heat Insulation:&#xA0;</strong>Foamed polyethylene insulation with a minimum thickness of 3/8 of an inch (10 mm).&#xA0;</li></ul><h2 id="isPasted"><u>Install the Drainpipe Assembly</u></h2><p id="isPasted">Attach the drainpipe assembly to the indoor unit&apos;s drain line connection.&#xA0;</p><p>Unlike wall-mounted systems, ducted ceiling concealed units and other light commercial air conditioning systems require a PVC drain line. The flexible drain hoses are not suitable for these applications.&#xA0;</p><p>Use a rubber coupler to connect the drainpipe assembly to the PVC drain line, ensuring a secure, water-tight seal. The rubber coupler and PVC drain line are sold separately from the system.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026022013-e2050126-f8bf-4566-8e08-a25204d216a3-cyt24_drain_hose_rubber_coupler.png" style="width: 150px;" class="fr-fic fr-dib fr-bordered"></p><p>This is an example of what the drainpipe assembly should look like:&#xA0;</p><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026022013-67ed03da-c69f-4ef2-a5a7-b07d94b5b0a3-cyt24_drainpipe_assembly.png" style="width: 400px;" class="fr-fic fr-dib fr-bordered"></p><h2 id="upward-drainage-installation"><u>Upward Drainage Installation</u></h2><p>The maximum vertical rise of the drainage pipe should not exceed 14 inches (356 mm).&#xA0;</p><p>Maintain a horizontal extension of less than 4 inches (102 mm) from the indoor unit drain outlet before the rise.&#xA0;</p><p>There must be more than a 2 inch (51 mm) space between the end of the condensate drain and final termination point.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026021718-9811350c-28fc-4690-ab75-27654496156f-ryt24_condensate_piping_connections_upward_drainage.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><h2 id="isPasted"><u>Notes</u></h2><ul><li>Insulate all drain piping and connections to the indoor unit to prevent dew formation and dripping.&#xA0;</li><li>Wrap the entire length of the drainpipe assembly carefully with the provided heat insulation material. Start from the assembly and continue to the indoor unit connection. Use additional insulation material if necessary to fully cover all piping and connections.&#xA0;</li><li>Apply PVC adhesive to the connection point between the drainpipe and hose to ensure a watertight seal.&#xA0;</li><li>Apply the adhesive 1-1/2 inches (38 mm) from the end of the PVC pipe, then insert it into the hose. Allow at least 10 minutes for the adhesive to cure. Do not apply pressure to the joint during the drying period.&#xA0;</li><li>Ensure that there are no gaps or exposed sections that could cause condensation.&#xA0;</li><li>Maintain a continuous downward slope of more than a 1/4 inch per foot (minimum slope ratio of 1/50), with no dips, sags, or reverse slopes.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120521-e327dd73-3d2a-4842-8807-b28e7041516d-cyt24_idu_condensate_piping_connections_dont_pitch.png" style="width: 500px;" class="fr-fic fr-bordered fr-dib"></li><li>Install the support straps or brackets every 5-6-1/2 feet (1.5-2 m) along the horizontal runs to maintain proper slope and prevent sagging.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120521-f4ed78f1-757d-45bc-91aa-0594436da7f4-cyt24_idu_condensate_piping_connections_support_straps.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li><li>Keep the horizontal pipe length under 65 feet (20 m).</li><li>If installed side-by-side, maintain a gap of 3/8 of an inch (10 mm) between the parallel pipes.<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120521-f52a77be-9da3-4983-91d9-5d31d1c19509-cyt24_idu_condensate_piping_connections_slope_downward.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li></ul><h2 id="after-the-installation-is-completed"><u>After the Installation is Completed</u></h2><p>After the installation is finished, check the condensate drain line for leaks and proper drainage. If a condensate pump has been installed, check it to ensure proper operation. A condensate pump is included with this system. Pour water into the drain pan through the inspection port to confirm flow.</p>

Set Up the Condensate Piping Connections for Ducted Ceiling Concealed Indoor Units

This article explains how to suspend the air handler unit for ducted ceiling concealed systems.

<h2 id="isPasted"><u>Introduction</u></h2><p>This article explains how to suspend the air handler unit for ducted ceiling concealed systems. This is the second step in the installation process for ducted ceiling concealed indoor units.&#xA0;</p><p id="isPasted">This article is for the following system:&#xA0;</p><p><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ducted-ceiling-concealed" target="_blank" rel="noopener noreferrer">Quantum Ultra Ducted Ceiling Concealed (RYT-24)</a></p><h2 id="steps"><u>Steps</u></h2><ol><li>After setting the hanging bolts in place, slide one nut and washer onto each bolt. Position the nuts slightly above the final resting place of the four suspension brackets. Use tape to keep the washer in place.&#xA0;</li><li>Align the four hanging bolts into the T-groove of the indoor unit&apos;s hanging bracket. The hanging bolts are not included with the system.&#xA0;</li><li>Carefully lift and suspend the indoor unit using two people or a mechanical lifting device.&#xA0;</li><li>Use a bubble level or built-in indicator to ensure that the unit is perfectly level.&#xA0;</li><li>Attach the components in the following order:<ul><li>Nut (upper)</li><li>Gasket (upper)</li><li>Suspension bracket</li><li>Gasket (lower)</li><li>Nut (lower)&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026011917-d0b689e8-1fdb-403f-8fad-610e8e685011-ryt24_attach_components.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li></ul></li><li>Use a 3/8-inch locking nut to secure the final assembly. Fine-tune the adjustment until the cassette is level.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026011917-419904f8-c6e9-48ed-901a-9313f8f4185f-ryt24_level_indicator.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li><li>Tighten all the nuts firmly to ensure a stable and vibration-free installation, then re-check the levelness.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120520-c4890b31-1956-4bc1-b4c8-cf0d922e34c5-cyt24_suspend_air_handler_tighten_nuts.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li></ol><h2 id="notes"><u>Notes</u></h2><ul><li>If installing the unit in a location with a Sheetrock (plasterboard) ceiling, it&apos;s recommended to provide an access panel at a suitable location. This will facilitate the final connection of the refrigerant piping, condensate drain, and electrical wiring, allowing for future maintenance access. If installing an access panel is not possible, ensure that all final connections are completed before installing the cassette cover panel.&#xA0;</li><li id="isPasted">If installing the cassette body in a location that is more than 80&#xB0;F (27&#xB0;C) and 80% RH, add a insulation layer of polyethylene or similar material around the unit. The insulation layer should be 3/8 of an inch (10 mm).</li><li>Before installing the panel, complete all piping and wiring connections.&#xA0;</li><li>Verify the indoor unit and ceiling opening dimensions are correct prior to panel installation.&#xA0;</li><li>Seal all connection point gaps between the panel, ceiling, and indoor unit.&#xA0;</li></ul>

Suspend the Air Handler Unit for Ducted Ceiling Concealed Systems

This article explains the best duct selection practices for ducted ceiling concealed indoor units.

<h2 id="introduction"><u>Introduction</u></h2><p>This article explains the best duct selection practices for ducted ceiling concealed indoor units.&#xA0;</p><p id="isPasted">This article is for the following system:&#xA0;</p><p><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ducted-ceiling-concealed" target="_blank" rel="noopener noreferrer">Quantum Ultra Ducted Ceiling Concealed (RYT-24)</a></p><h2 id="outlet-duct-connection-guidelines"><u>Outlet Duct Connection Guidelines</u></h2><p>This indoor unit supports both rectangular and round duct connections. We do not have specific ducting recommendations as each project and scenario are different. However, follow the instructions below to ensure proper airflow and system performance.&#xA0;</p><p><strong>Rectangular Ducting</strong></p><p>Connect the rectangular air ducts directly to the indoor unit&apos;s discharge outlet using rivets or other secure fastening methods.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012114-d97d28c0-7574-4d03-9d56-f6bddf4cf622-ryt24_duct_selection_practices_rectangular_ducting.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><p><strong>Round Ducting</strong></p><p>Connect the round ducts using a transition adapter between the round duct and the unit&apos;s rectangular outlet. The outlet can then branch to one or more supply air grilles or air outlet windows as needed.&#xA0;</p><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012114-1342ad74-cc04-469d-b8a7-c41ad1ca8c6f-ryt24_duct_selection_practices_round_ducting.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><p><strong>Important Notes</strong></p><ul><li>Use airflow diverters or branch dampers to balance the airflow to multiple outlet grilles, if needed.&#xA0;</li><li>Ensure that the air velocity at each outlet is consistent in order to maintain uniform comfort throughout the conditioned space.&#xA0;</li><li>Always comply with local building codes and ducting best practices when routing and insulating ducts.&#xA0;</li></ul><h2 id="return-air-duct-installation"><u>Return Air Duct Installation</u></h2><p>The indoor unit comes pre-configured for downward air return, but can be modified for rear (backward) air return operation if needed. For information on configuring the indoor unit for rear air return operation, click this <a href="https://help.pioneerminisplit.com/en-US/ryt24-configure-rear-air-return-4223415" target="_blank" rel="noopener noreferrer">link</a>.&#xA0;</p><p>Use the following procedures for proper installation.&#xA0;</p><p><strong>Downward (Underside) Return Configuration</strong></p><p>Use a section of pleated canvas duct as a flexible connection between the unit&apos;s return air opening and return air grille. Secure the duct to the unit and grille using rivets or suitable fasteners.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012114-89d4c6fa-6809-4b59-8835-26c14c821b6a-ryt24_duct_selection_practices_bottom_return.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><p>The flexible canvas connection allows for adjustment based on the ceiling height. In addition, the connection helps absorb vibration, reduce noise, and prevent ceiling panel movement during operation.&#xA0;</p><p><strong>Rear (Sideways) Return Configuration</strong></p><p>Fabricate or obtain a rigid return air duct, then connect it securely to the unit&apos;s return air opening using rivets.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012114-0c15857f-2a8a-4eae-ab0d-826ebcc7c20e-ryt24_duct_selection_practices_rear_return.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><p>Connect the opposite end of the duct to the return grille or air return window.&#xA0;</p><p>A duct flex connector is recommended at the grille end to allow slight movement and provide noise isolation.&#xA0;</p><p><strong>Note:&#xA0;</strong>Regardless of the configuration, always ensure that all connections are airtight and structurally supported to avoid air leakage, vibration, and noise during operation.&#xA0;</p>

Understand the Best Duct Selection Practices for Ducted Ceiling Concealed Indoor Units

This article explains how to wire the ducted ceiling concealed indoor unit.

<h2 id="introduction"><u>Introduction</u></h2><p>This article explains how to wire the ducted ceiling concealed indoor unit. The article also explains how to connect the signal cable to the indoor unit.&#xA0;</p><p id="isPasted">This article is for the following system:&#xA0;</p><p><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ducted-ceiling-concealed" target="_blank" rel="noopener noreferrer">Quantum Ultra Ducted Ceiling Concealed (RYT-24)</a></p><h2 id="isPasted"><u>Indoor Unit Wiring</u></h2><p>Open the electrical junction box to access the wiring terminals. Ensure that all connecting wires are routed through the wire-inlet rubber grommet to maintain a proper seal.&#xA0;</p><p>Connect the wires in accordance with the wiring diagram, then verify that all wire strands are fully inserted and securely clamped at the terminals. All connections must be tight and free of looseness.&#xA0;</p><table style="width: 100%;"><tbody><tr><td style="width: 33.237%; text-align: center; background-color: rgb(239, 239, 239);" colspan="2" rowspan="2" class="fr-thick"><strong>RYT-24</strong></td><td style="width: 16.6185%; text-align: center; background-color: rgb(239, 239, 239);" class="fr-thick"><strong>9K</strong></td><td style="width: 16.6185%; text-align: center; background-color: rgb(239, 239, 239);" class="fr-thick"><strong>12K</strong></td><td style="width: 16.6667%; text-align: center; background-color: rgb(239, 239, 239);" class="fr-thick"><strong>18K</strong></td><td style="width: 16.6667%; text-align: center; background-color: rgb(239, 239, 239);" class="fr-thick"><strong>24K</strong></td></tr><tr><td style="width: 66.474%; text-align: center; background-color: rgb(239, 239, 239);" colspan="4" class="fr-thick"><strong>Sectional Area (AWG)</strong></td></tr><tr><td style="width: 26.1561%;" rowspan="3" class="fr-thick"><div style="text-align: center;">Power Supply Cable</div></td><td style="width: 7.1532%; text-align: center;" class="fr-thick">L2</td><td style="width: 16.6185%; text-align: center;" rowspan="3" class="fr-thick">14 AWG</td><td style="width: 16.6185%; text-align: center;" rowspan="3" class="fr-thick">14 AWG</td><td style="width: 16.6185%; text-align: center;" rowspan="3" class="fr-thick">12 AWG</td><td style="width: 16.6185%; text-align: center;" rowspan="3" class="fr-thick">12 AWG</td></tr><tr><td style="width: 7.1532%; text-align: center;" class="fr-thick">L1</td></tr><tr><td style="width: 7.1532%;" class="fr-thick"><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012115-25fcd207-460b-4a37-a256-4a81767aba7a-ryt24_wire_idu_symbol.png" style="width: 50px;" class="fr-fic fr-dii"></td></tr><tr><td style="width: 26.1561%; text-align: center;" rowspan="4" class="fr-thick">Connection Cable for Communication Between Indoor &amp; Outdoor Units</td><td style="width: 7.1532%; text-align: center;" class="fr-thick">3(L)</td><td style="width: 16.6185%; text-align: center;" rowspan="4" class="fr-thick">16 AWG</td><td style="width: 16.6185%; text-align: center;" rowspan="4" class="fr-thick">16 AWG</td><td style="width: 16.6185%; text-align: center;" rowspan="4" class="fr-thick">16 AWG</td><td style="width: 16.6185%; text-align: center;" rowspan="4" class="fr-thick">16 AWG</td></tr><tr><td style="width: 7.1532%; text-align: center;" class="fr-thick">2(N)</td></tr><tr><td style="width: 7.1532%; text-align: center;" class="fr-thick">1(S)</td></tr><tr><td style="width: 7.1532%;" class="fr-thick"><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012115-c95f7295-b611-4d7a-ac5e-f8f50fd557f9-ryt24_wire_idu_symbol.png" style="width: 300px;" class="fr-fic fr-dii"></td></tr></tbody></table><p><strong>Notes</strong></p><ul><li>Consult the nameplate on the system for detailed electrical specifications.&#xA0;</li><li>230V systems require a double-pole breaker (tandem-type will not work).&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012115-a78f00c2-defd-455c-adf7-16ca5711d80d-ryt24_wire_idu_double_pole_230v_breaker.png" style="width: 500px;" class="fr-fic fr-bordered fr-dib"></li></ul><h2 id="connect-the-signal-cable"><u>Connect the Signal Cable</u></h2><p id="isPasted">The indoor unit has three terminals (1, 2, 3) and a ground terminal (g). It is vital that the colors and numbers between the indoor and outdoor units match for each terminal. The color selection does not matter as much as matching number to number does. Do not mix up the wires between each end.&#xA0;</p><p>Connect the wires in accordance with the wiring diagrams, then verify that all wire strands are fully inserted and securely clamped at the terminals. All connections must be tight and free of looseness.&#xA0;</p><p>Consult the diagram affixed to the indoor and outdoor units respectively for specific wiring instructions.&#xA0;</p><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026012115-a3af8acd-a76a-463d-a662-63cc655630e4-ryt24_wire_idu_simplified_diagram.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><h2 id><br></h2>

Wire the Indoor Unit for Ducted Ceiling Concealed Systems

This article explains how to wrap the lines and seal the air gaps for ducted ceiling concealed indoor units.

<h2 id="isPasted"><u>Introduction</u></h2><p>This article explains how to wrap the lines and seal the air gaps for ducted ceiling concealed indoor units.&#xA0;</p><p>Even small gaps can result in air or water leakage, or cause condensation to form.&#xA0;</p><p id="isPasted">This article is for the following system:&#xA0;</p><p><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ducted-ceiling-concealed" target="_blank" rel="noopener noreferrer">Quantum Ultra Ducted Ceiling Concealed (RYT-24)</a></p><h2 id="steps"><u>Steps</u></h2><ol><li>Arrange the pipes, cables, and drain hose correctly.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120815-2cb79760-f9ef-4b9a-a29d-55fa8197be57-cyt24_connect_refrigerant_piping_idu_bundle.png" style="width: 400px;" class="fr-fic fr-dib fr-bordered"></li><li>Lag the pipe joints with insulation material and secure them with vinyl tape.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120815-77bbaf96-163b-4af8-bf76-077a3fcad7f6-cyt24_connect_refrigerant_piping_idu_vinyl_tape.png" style="width: 400px;" class="fr-fic fr-dib fr-bordered"></li><li>Run the bound bundle through the wall hole, ensuring not to kink the drainpipe when binding.&#xA0;</li><li>Ensure that all the connections between the panel and ceiling, as well as between the panel and indoor unit are properly sealed.&#xA0;</li></ol>

Wrap the Lines & Seal the Air Gaps for Ducted Ceiling Concealed Indoor Units

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