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<h2 id="introduction"><u>Introduction</u></h2><p>This article explains how to install the indoor air handler for <a href="https://www.pioneerminisplit.com/collections/types?q=CYK-24" target="_blank" rel="noopener noreferrer">CYK-24 single-way ceiling cassette systems</a>.&#xA0;</p><h2 id="warning"><u>Warning</u></h2><p>Follow the local regulations and take measures to isolate high and low voltages.</p><h2 id="notes"><u>Notes</u></h2><ul><li style="font-size: 16px;">After installing the main body, determine the piping direction. Align the refrigerant pipes, drainpipes, and wiring with their connection points before mounting the unit.&#xA0;</li><li style="font-size: 16px;">Ensure enough wire length is reserved for periodic maintenance. If the shielded wire has a connection lug, ensure it is properly grounded.&#xA0;</li></ul><h2 id="steps"><u>Steps</u></h2><p>1. Drill a hole with a diameter of 1/4 inch (6 mm) or less into the roof beam, following the layout of the installation template. Once the hole is drilled, remove the template.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026051212-f1c0510a-4d69-480c-8630-f44099969e2a-cyk24_idu_installation_step2_1.png" style="width: 600px;" class="fr-fic fr-dib fr-bordered"></p><p>2. Connect the wire from the control box.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026051212-dd640e15-07c2-41b3-bdab-8853704743c7-cyk24_idu_installation_step2_2.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p><p>3. Connect the other side of the cable to the wired controller.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026051212-bc798a11-b499-459f-b505-f7ff89711463-cyk24_idu_installation_step2_3.png" style="width: 500px;" class="fr-fic fr-dib fr-bordered"></p>

This article explains how to install the indoor air handler for CYK-24 single-way ceiling cassette systems.

Install the Indoor Air Handler for CYK-24 Single-Way Ceiling Cassette Systems

Installation

Ductless & Ducted Systems

Indoor Units

Ceiling Cassettes

CYK Single-Way Cassette Units

Pioneer Offers Hyper-Heat Units

Pioneer Systems Offer Both Heating & Cooling Functions

Understand the Difference Between 115V & 230V Systems

Understand the Refrigerants Used for Each Model

How to Choose a System

Mini Splits are Capable of Using Fewer Indoor Units than the Outdoor Unit’s Zonal Capacity

Pioneer Mini Splits Function as Dehumidifiers

Pioneer Offers Different Lineset Lengths

Pioneer Offers Pre-Charged Linesets

Pioneer Offers Pre-Flared Linesets

Pioneer Systems Include Factory Pre-Charged Refrigerant

Single-Zone Mini Splits Cannot be Used with Multiple Indoor Units

Understand the Allowable Zone Combinations for Multi-Zone Systems

Understand how Mini Splits are Powered

Understand the Life Expectancy of Pioneer Systems

Understand the Meaning of “Multi-Zone”

Mini-Split Basics

Determine the Unit Size Needed for Your Space

Match the Lineset Diameter to Your Pioneer Indoor Unit

Understand Why Short Cycling Occurs When Sizing Systems

Sizing & Efficiency Guide

Start Here

Understand the Differences Between Inverter+ & Inverter++ Systems

Understand the Differences Between the Wall-Mounted Ductless Mini Splits

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Diamante Essenza High-Wall (WYT-17) Overview

Diamante Pro High-Wall (WYT-20) Overview

Quantum Fresh High-Wall (WYT-FA) Overview

Quantum Hyperformance High-Wall (WYT-25) Overview

Quantum Ultra Ceiling Cassette (CYB-20) Overview

Quantum Ultra Ceiling Cassette (CYT-24) Overview

Quantum Ultra Ducted Ceiling Concealed (RYB-20) Overview

Quantum Ultra Ducted Ceiling Concealed (RYT-24) Overview

Quantum Ultra Floor-Ceiling Flex (UYB-20) Overview

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

Quantum Ultra Floor/Low-Wall Mounted Console (FYB-20) Overview

Quantum Ultra High-Wall (WYT-24) Overview

Quantum Ultra Multi-Zone Overview

Quantum Ultra Single-Way Ceiling Recessed Cassette (CYK-24) Overview

Vertex Ducted Central Split (DYC-18) Overview

Ducted & Ductless Systems

ECOasis 50 Ductless Wall-Mounted Single-Room Energy Recovery Ventilator (ERV) Overview

ECOasis 150 Ductless Wall-Mounted Single-Room Energy Recovery Ventilator (ERV) Overview

Energy Recovery Ventilators

QHD070 Whole-House Ducted Dehumidifier (QHD) Overview

High Performance Dehumidifier

Full Inverter Rooftop RV Air Conditioner Heat Pump (PYZ) Overview

Under-Bench RV Inverter Packaged Heat Pump Air Conditioner (PYR) Overview

Recreational Vehicle Systems

Product Line Overviews

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Shopping & Pre-Purchase

Find Out if Our Systems Support Self-Installation

Locate an Installer for Your System

Understand the Cost & Time Spent on Installing Systems

First-Time Installations

Can Wall-Mounted Indoor Units Be Installed Onto the Ceiling Instead?

Does the Indoor Unit Need Additional Hardware for Wall Mounting?

Lineset Installation FAQ

What are the Drilling Requirements to Install Drain & Refrigerant Lines?

What are the Requirements for Installing Wall-Mounted Systems?

What is the Difference Between the 6-foot Plastic Whip & 4-Lead Wire?

What is the Ideal Height for Mounting Indoor Units?

What is the Standard Wire Gauge Needed for Connections?

General Installation FAQ

Conduct Drainage Tests for 4- & 8-Way Ceiling Cassette Systems

Conduct Drainage Tests for Ducted Ceiling Concealed Systems

Conduct Drainage Tests for Single-Way Ceiling Cassette Systems

Conduct Drainage Tests for Wall-Mounted Systems

Conduct Test Runs

Connect the Refrigerant Piping

Installation Basics

Ducted Ceiling Concealed

Ducted Central Split

Floor-Ceiling Flex-Mounted Consoles

Wall-Mounted Units

Install Outdoor Units: Getting Started

Connect the Electrical Wiring for Outdoor Units

Mount the Outdoor Unit

Select the Installation Location for Outdoor Units

Select the Installation Location for Ducted Central Split Outdoor Units

Set Up the Condensate Water Drainage for Outdoor Units

Understand How to Install Ducted Central Split Outdoor Units on Support Pads

Outdoor Units

Install ECOasis 50 Energy Recovery Ventilators

Install ECOasis 150 Energy Recover Ventilators

Energy Recovery Ventilator

Connect the Drain Fitting for QHD070 Whole-House Ducted Dehumidifiers

High Performance Dehumidifiers

Install Rooftop RV Systems: Getting Started

Create the Roof Opening for Rooftop RV Systems

Install the Air Duct & Top Mounting Plate for Rooftop RV Systems

Mount the Panel for Rooftop RV Systems

Place the Unit onto the Roof for Rooftop RV Systems

Setup the Electrical Wiring for Rooftop RV Systems

Setup the System Connections for Rooftop RV Systems

Understand the Installation Requirements for Rooftop RV Systems

Rooftop RV Inverter

Install Under-Bench RV Systems: Getting Started

Connect & Power Up Under-Bench RV Systems

Create the Floor Openings for Under-Bench RV Systems

Create the Recirculation Air Opening for Under-Bench RV Systems

Fasten the Under-Bench RV System into Place

Install the Wall Thermostat for Under-Bench RV Systems

Understand the Ductwork Best Practices for Under-Bench RV Systems

Understand the Installation Requirements for Under-Bench RV Systems

Under-Bench RV Inverter

Understand the DIP Switches for Vertex Ducted Central Split Systems

DIP Switch Layouts

Turn the LED Display On or Off

Understand the Display Board for Ducted Ceiling Concealed Systems

Understand the Display Panel for Rooftop RV Systems

Understand the Front Panel Displays for Ceiling Cassette Systems

Understand the Front Panel Display for Floor-Ceiling Flex Systems

Understand the Front Panel Display for Wall-Mounted Systems

Understand the Master Unit Display for ECOasis 50 Energy Recovery Ventilators

Understand the Onboard Controller & Terminal Block Layout for QHD070 Whole-House Ducted Dehumidifiers

Understand the Wall Controller Display for RV Under-Bench Systems

Display Layouts

CL Error Code

Clean the Filters for Diamante Essenza & Pro High-Wall Systems

Clean the Filters for Quantum Fresh High-Wall Systems

Clean the Filters for Quantum Ultra Ceiling Cassette Systems

Clean the Filters for Quantum Ultra Ducted Ceiling Concealed Systems

Clean the Filters for Quantum Ultra Floor-Ceiling Flex Systems

Clean the Filters for Quantum Ultra & Hyperformance High-Wall Systems

Clean the Filter Screen for Rooftop RV Systems

Clean the Filters for Under-Bench RV Systems

Filter Cleaning & CL Code

Activate Auto Mode

Activate the Child-Lock Function

Activate Cooling Mode

Activate Dry Mode

Activate Energy Saver (ECO) Mode

Activate Fan-Only Mode

Activate the Fresh Air Feature for Quantum Fresh High-Wall Systems

Activate Gentle Wind Mode for Quantum Fresh High-Wall Systems

Activate Heating Mode

Activate the I Feel Feature

Activate the Memory Feature

Activate Mute Mode

Activate the Self-Clean Feature

Activate Sleep Mode

Activate the Timer On/Timer Off Function

Activate Turbo Mode

Activate 46°F Freeze Protection

Understand the Auto-Restart Feature

Understand the Voice Control Feature For Quantum Fresh High-Wall Systems

Diamante & Quantum Systems

Understand the Defrost Function

Understand the Dehumidification Function

Understand the Drainage Functions

QHD070 Whole-House Dehumidifiers

Activate Dehumidification Mode

Activate Night Mode

Activate Ventilation Mode

Rooftop RV Systems

Under-Bench RV Systems

Activate the Accelerated Cooling/Heating Function

Understand the Anti-Cold Air Function

Understand the Compressor Crankshaft Heater Control Function

Understand the Heating Fan Delay Function

Understand the Indoor Coil Anti-Freezing Function

Understand the Passive Dehumidification Function

Understand the Refrigerant Leak Detection Function

Vertex Ducted Central Split Systems

Functions & Modes Explained

Determine the Breaker Size & Wire Needed for Your System

Diagnose & Prevent Crossed Wiring in Multi-Zone Systems

Understand how the System Receives Power

Electrical Related Queries

Maintenance Tips

Operation & Usage

Install the Indoor Air Handler for CYK-24 Single-Way Ceiling Cassette SystemsUpdated a day ago

Introduction

Warning

Notes

Steps