For best longevity and durability, Pioneer recommends routing the included flexible drain hose through PVC.

<p>For best longevity and durability, Pioneer recommends routing the included flexible drain hose through PVC.&#xA0;</p><p>Pioneer Light Commercial Air Conditioning (LCAC) equipment includes the following systems:&#xA0;</p><ul><li><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ceiling-cassette" target="_blank" rel="noopener noreferrer">Quantum Ultra Ceiling Cassette (CYT-24)</a></li><li><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ducted-ceiling-concealed" target="_blank" rel="noopener noreferrer">Quantum Ultra Ceiling Concealed (RYT-24)</a></li><li id="isPasted"><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-universal-flex-series" target="_blank" rel="noopener noreferrer">Quantum Ultra Floor-Ceiling Flex (UYT-24)</a></li></ul><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111219-3830ed67-9745-4457-836b-0253bfd362ca-image%20(15).jpg" style="width: 519px;" class="fr-fic fr-dib fr-bordered"></p><p>(Option A) You can use a rubber coupler to mate the drain tube end to a 3/4&quot; PVC pipe.</p><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111219-693fb8a3-8532-45a2-8b56-39a77a54db03-697a6adb-143d-4941-9862-b414483f5d1d.png" style="width: 300px;" class="fr-fic fr-dib fr-bordered"></p><p>(Option B) Another option is to insert the drain tube end directly into a 1-inch Schedule 40 PVC pipe, using some waterproofing tape to create a flush and snug seal.&#xA0;</p><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111219-413b0416-c58e-4955-9b32-827cb49b12d6-99be0c7d-f938-41b6-8075-048902c50d88%20background%20removed.png" style="width: 300px;" class="fr-fic fr-dib fr-bordered"></p><p>It&apos;s recommended to add additional tape around the external of the connection point for better security.</p>

Connect the Drain Hose for LCAC Systems

This article explains how to connect the refrigerant piping to the indoor unit for all systems.

<h2 id="introduction"><u>Introduction</u></h2><p>This article explains how to connect the refrigerant piping to the indoor units. The procedure for connecting the refrigerant piping to the indoor unit is the same for these systems.&#xA0;</p><p>This article is for the following systems:&#xA0;</p><ul><li><a href="https://www.pioneerminisplit.com/collections/diamante-essenza-high-wall-series" target="_blank" rel="noopener noreferrer">Diamante Essenza (WYT-17)</a></li><li><a href="https://www.pioneerminisplit.com/collections/diamante-pro-high-wall-series" target="_blank" rel="noopener noreferrer">Diamante Pro (WYT-20)</a></li><li><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-high-wall-series" target="_blank" rel="noopener noreferrer">Quantum Ultra (WYT-24)</a></li><li><a href="https://www.pioneerminisplit.com/collections/quantum-hyperformance-high-wall-series" target="_blank" rel="noopener noreferrer">Quantum Hyperformance (WYT-25)</a></li><li><a href="https://www.pioneerminisplit.com/collections/quantum-fresh-series-breathe-the-difference" target="_blank" rel="noopener noreferrer">Quantum Fresh (WYT-FA)</a></li><li><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-ceiling-cassette" target="_blank" rel="noopener noreferrer">Quantum Ultra Ceiling Cassette (CYT-24)</a></li><li><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></li><li><a href="https://www.pioneerminisplit.com/collections/quantum-ultra-universal-flex-series" target="_blank" rel="noopener noreferrer">Quantum Ultra Floor-Ceiling Flex (UYT-24)</a></li></ul><p>For information on preparing the refrigerant piping, click <a href="https://help.pioneerminisplit.com/en-US/wall-mounted-systems-prepare-refrigerant-piping-idu-3624238" target="_blank" rel="noopener noreferrer" style=" text-decoration: none !important;" id="isPasted">here</a>.</p><h2 id="steps"><u>Steps</u></h2><ol><li>Unwind the copper piping kit.&#xA0;</li><li>Bring the ends of both the copper line and the indoor unit line together. Align the centers of the pipes that will be connected.&#xA0;</li><li>Remove the indoor unit piping cap and check that no debris is inside. Some gas may be heard escaping, but it is dry nitrogen keeping the lines clean.&#xA0;</li><li>Use leak guards and/or flare sealers on the flares of the piping.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120121-5bc63465-9834-475f-bb23-4022b918061b-wyt17_connect_refrigerant_piping_idu_leak_guard.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li><li>Attach the flare nut and tighten as much as possible by hand.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120121-204b8ed5-e815-4959-a3a0-74df9a2d8c47-wyt17_connect_refrigerant_piping_hand_tighten.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li><li>Use two wrenches to torque correctly to the specifications found in the table below.<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120121-44bc1f73-4a86-4f7f-934a-d95216d830e5-wyt17_connect_refrigerant_piping_torque_wrench.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></li><li>Repeat this process for the other copper line.&#xA0;</li></ol><h2 id="tightening-torque-for-protection-caps--flange-connection"><u>Tightening Torque for Protection Caps &amp; Flange Connection</u></h2><table style="width: 100%;"><thead><tr><th><div style="text-align: center;">Pipe Diameter</div></th><th style="text-align: center;">Tightening Torque<br>[N x m]</th><th style="text-align: center;">Tightening Torque<br>[ft-lbf]</th><th style="text-align: center;">Corresponding Stress<br>(Using a 20 cm wrench)</th></tr></thead><tbody><tr><td style="width: 25.0000%;"><div style="text-align: center;">&#x3A6; 1/4&quot; (6.35 mm)</div></td><td style="width: 25%; text-align: center;">15-20</td><td style="width: 25%; text-align: center;">11-15</td><td style="width: 25%; text-align: center;">Wrist strength</td></tr><tr><td style="width: 25%; text-align: center;">&#x3A6; 3/8&quot; (9.52 mm)</td><td style="width: 25%; text-align: center;">31-35</td><td style="width: 25%; text-align: center;">23-26</td><td style="width: 25%; text-align: center;">Arm strength</td></tr><tr><td style="width: 25%; text-align: center;">&#x3A6; 1/2&quot; (12 mm)</td><td style="width: 25%; text-align: center;">45-50</td><td style="width: 25%; text-align: center;">33-37</td><td style="width: 25%; text-align: center;">Arm strength</td></tr><tr><td style="width: 25%; text-align: center;">&#x3A6; 5/8&quot; (15.88 mm)</td><td style="width: 25%; text-align: center;">60-65</td><td style="width: 25%; text-align: center;">44-48</td><td style="width: 25%; text-align: center;">Arm strength</td></tr></tbody></table><p><br></p><table style="width: 58%; margin-right: calc(42%);"><thead><tr><th colspan="2" style="width: 100%;"><div style="text-align: center;">Tightening Torque [N x m] (ft-lbf)</div></th></tr></thead><tbody><tr><td style="width: 50%; text-align: center;">Service Port Nut</td><td style="width: 50%; text-align: center;">[7-9] (5-7)</td></tr><tr><td style="width: 50%; text-align: center;">Protection Caps</td><td style="width: 50%; text-align: center;">[25-30] (18-22)</td></tr></tbody></table>

Connect the Refrigerant Piping to the Indoor Unit

Cassette Units

Ducted Units

Flex Units

Wall-Mounted Units

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