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<p>Pioneer systems, as of August 2025, are using two refrigerants, R32 and R454B. The below table details which series of models use which.</p><h4 id="r32"><strong>R32</strong></h4><table style="width: 100%;"><tbody><tr><td style="width: 100.0000%;">WYT-17 (Diamante Essenza) High Wall Ductless&#xA0;</td></tr><tr><td style="width: 100.0000%;">WYT-FA (Quantum Fresh) High Wall Ductless</td></tr><tr><td style="width: 100.0000%;">PYR and PYZ (Recreational / RV) Packaged Systems</td></tr><tr><td style="width: 100.0000%;">QHD (Whole-Home Dehumidifier)</td></tr></tbody></table><p><br></p><h4 id="r454b"><strong>R454B</strong></h4><table style="width: 100%;" class="fr-table-selection-hover"><tbody><tr><td style="width: 100.0000%;">WYT-20 (Diamante Pro) High Wall Ductless&#xA0;</td></tr><tr><td style="width: 100.0000%;">WYT-24 (Quantum Ultra) High Wall Ductless&#xA0;</td></tr><tr><td style="width: 100.0000%;">WYT-25 (Quantum Hyperformance) High Wall Ductless&#xA0;</td></tr><tr><td style="width: 100.0000%;">YNL-24 + MSI-24 (Quantum Ultra) Multi-Zone Outdoor and Indoor Units<br></td></tr><tr><td style="width: 100.0000%;">CYT-24 (Quantum Ultra) Ceiling Cassettes</td></tr><tr><td style="width: 100.0000%;">UYT-24 (Quantum Ultra) Floor-Ceiling Flex Consoles</td></tr><tr><td style="width: 100.0000%;">RYT-24 (Quantum Ultra) Ceiling Concealed Ductable</td></tr><tr><td style="width: 100.0000%;">DYC-18 (Vertex) Centrally Ducted Split Heat Pumps</td></tr></tbody></table>

Pioneer systems, as of August 2025, are using two refrigerants, R32 and R454B.

What refrigerants are used for Pioneer units?

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How to Choose a System

Can I buy a Pioneer system that only offers cooling?

Do you carry hyper-heat units (-22°F)?

What is the difference between 115V and 230V systems?

Are the linesets pre-flared when I buy a mini split?

Can a single-zone mini split be used with multiple indoor units?

Can I order different lineset lengths?

Can I use a mini-split system with fewer indoor units than the outdoor unit's zonal capacity?

Do these split-type systems function as dehumidifiers?

Do you offer pre-charged linesets?

Does my system include factory pre-charged refrigerant?

What is the life expectancy of my system?

Mini-Split Basics

How do I determine the unit size needed for my space?

Lineset diameter selection guide

Short cycling when sizing systems

Sizing & Efficiency Guide

What is the difference between Inverter+ and Inverter++ systems?

Which units are rated Energy-Star?

Understand the differences between the wall-mounted ductless mini splits

Compare Models

Do you offer any discounts?

How do I use my Pioneer Rewards Points when shopping?

How does the Energy-Star Federal Tax Credit work for Pioneer systems?

Where can I learn more about IRA tax credits?

Why do I see multiple charges on my credit card?

Why does the discount code only say "SAMPLE" when trying to refer friends?

Financing & Payment

Free shipping qualifications

Shipping and delivery details

Order Status & Shipping

Diamante Essenza (WYT-17) Overview

Diamante Pro (WYT-20) Overview

Quantum Ultra - High-Wall Series (WYT-24) Overview

Quantum Hyperformance (WYT-25) Overview

Quantum Fresh (WYT-FA) Overview

Quantum Ultra - Ceiling Cassette (CYT-24) Overview

Quantum Ultra - Ducted Ceiling Concealed (RYT-24) Overview

Quantum Ultra - Floor-Ceiling Flex (UYT-24) Overview

Vertex Ducted Central Split (DYC-18) Overview

Quantum Ultra - Multi-Zone Overview

Product Line Overviews

How do I make a return?

Process for returning an item

Refund eligibility requirements

Return an item

Return fees

Return policy

Start your return

Undeliverable or refused shipments

Returns & Refunds

Shopping & Pre-Purchase

Are Pioneer systems able to be self-installed?

Are there recommended resources to find a professional near me?

How do I find an installer for my purchase?

What is the cost and time spent on installing systems?

Who is permitted to install the A/C?

First-Time Setup

Can the lineset be angled upward?

Can the lineset exit from the side of the indoor unit?

Can a wall-mounted indoor unit be set onto the ceiling instead?

Does the indoor unit require anything extra in order to be mounted to the wall?

How to connect the drain hose of LCAC systems

Understand 6-foot plastic whips and 4-lead mini split connection wire

What are the requirements for installing a mini split?

What gauge of wire is used for connections between the ductless mini split indoor and outdoor sections?

What hole saw size do I need for drilling walls to accommodate drain and refrigerant lines?

What is the ideal height for mounting indoor units?

What torque wrench size do I need?

Installation Requirements

What does “multi-zone” mean?

Multi-Zone Units

Installation & Setup

CL error code

Filter Cleaning & CL Code

Diagnose and prevent crossed wiring in multi-zone systems

Do I need to restart my unit manually after the power goes out?

How do I determine which breaker size and wire is needed for my system?

How does my system receive power?

Electrical Related Queries

Can I turn off the LED display for the indoor unit?

How can I locate the Pioneer model or serial number for my system?

General Queries

Does the fan for my system shut off in Cooling mode?

How can I check the resistance of a Pioneer temperature sensor?

How can I fix my indoor air handler when the unit is not turning on?

What type of oil is used for my unit?

Understand how Cased A-Coils interact with furnaces and other heating units

HVAC Related Queries

Maintenance Tips

Can I operate the indoor unit without a remote control?

Switch between °F and °C on the RG10 remote

RG10 Remote

Remote Control Guides

Connect CYB, RYB, and UYB systems with the NetHome Plus App

Connect WYS-20 and WYS-22 systems with the NetHome Plus App

NetHome Plus

Connect your WYT-19 Diamante Series with the Pioneer Airlink App

Connect your WYT-22/WYT-24/WYT-25 Series with the Pioneer Airlink App

Integrate the Pioneer Airlink App with Apple's Smart Home Environment

Pioneer Airlink App

Wi-Fi App Guides

Operation & Usage

E0 error code

E1 or E2 error codes

E3, E7, or E8 error codes

E4 error code

E6 error code

E9 error code (Diamante Series)

E9 error code (Quantum Series)

EF error code

EU error code

F4 error code

F5 error code

F6 error code (Diamante Series)

F6 error code (Quantum Series)

F7 error code

F8 error code

Fd error code

Fy error code

H1 or H2 error code (Multi-Zone Quantum Ultra Series)

P0 error code

P1 error code

P2 error code

P4 error code (Diamante Series)

P4 error code (Quantum Series)

P5 error code

P6 error code

P7 error code

P8 error code

P9 error code

PA error code (Multi-Zone Quantum Ultra Series)

By Error Code

Why did my ductless mini split system freeze on the inside air handler?

Not Heating

How can I fix leaks that are difficult to trace?

How do I apply Pioneer Flare Leak Guard during installation?

Why is my wall-mounted indoor unit leaking water improperly?

Water Leaks

By Symptom

E9/P0 error codes

Indoor unit displaying 0A code

Troubleshooting (WYT-19 & WYT-22)

E1/EL 01/EL01 error codes

E3/EH 03/F5/EC 07 error codes

EC/EL 0C error codes

F4/EC51 error codes

LCAC error codes

P0/PC00 error codes

P1/PC01 error codes

P2/PC02 error codes

PC 03/PC03 error codes

P4/PC 04/PC04 error codes

Troubleshooting (WYS, CYB, RYB, UYB, & FYB)

Troubleshooting (Discontinued Products)

Troubleshooting

IDU Disassembly for Diamante Essenza / Diamante Pro / Quantum Ultra - High Wall Mount

IDU Disassembly for Quantum Hyperformance

ODU Disassembly for Diamante Essenza / Diamante Pro / Quantum Ultra - High Wall Mount / Quantum Hyperformance

What refrigerants are used for Pioneer units?Updated 7 hours ago

R32

R454B