Johnson Controls YH5 Series - Page 2

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2 Installation Manual: R-454B Outdoor Split-System Single-Phase Heat Pump - YH5 and XH5 Series

Johnson Controls Ducted Systems

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Table of Contents3
About the Unit5
Certification5
DS Solutions App5
Safety6
Understanding Safety Symbols and Instructions6
Safety Requirements7
A2L Refrigerant Safety Considerations8
General8
Room Size Requirements9
Mechanical Ventilation11
Refrigerant Equipment Checks11
Electrical Devices Checks12
Detection of Refrigerant12
Wiring Installation13
Installation Overview16
Preparing for Installation17
Selecting a Location for Installation17
Inspecting the Unit19
Understanding Installation and Operation Limitations19
Meeting Requirements for A2L Equipment19
Installing the Outdoor Unit21
Setting the Outdoor Unit on the Ground or on a Roof21
Mounting the Outdoor Unit on a Wall23
Installing the Outdoor Unit as a Replacement Unit23
Installing the Refrigerant Piping25
Installing the Vapor and Liquid Lines25
Installing the Liquid Line Filter-Drier27
Brazing the Refrigerant Lines and Service Valves27
Installing the Thermostatic Expansion Valve (TXV)29
Checking for Refrigerant Leaks32
Evacuating the Refrigerant Lines and Indoor Coil32
Releasing Refrigerant into the System33
Connecting the Wiring34
General Information and Grounding the Unit34
Completing the Field Power Wiring Connections35
Completing the Field Control Wiring Connections35
Control Wiring Diagrams37
Using the Optional S1-2HU16700124 Dehumidification Control40
Charging the System41
Measuring Indoor Airflow42
Checking the Indoor Cubic Feet Per Minute (CFM) Settings42
Determining the Total System Charge42
Charging with Gauges43
Subcooling Charging Charts44
Heating Charging Charts51
Starting up the System56
Energizing the Crankcase Heater (if Applicable)56
Instructing the Owner57
Maintenance and Repair57
Required Procedures for A2L Systems58
Decommissioning59
Test Input60
System Components and Operation62
Anti-Short-Cycle Delay62
Low Voltage Detection62
Fault Code Display62
Demand Defrost63
Operating Demand Defrost63
Defrost Curves64
Defrost Curve Selection64
Defrost Cycle Initiation64
Defrost Inhibition64
Defrost Termination65
Cooling Operation65
Heating Operation65
Emergency Heat65
Pressure Switch Fault Detection and Lockout66
Third-Party Trademarks Notice66
Wiring Diagrams67
Start-Up Sheet69

Johnson Controls YH5 Series - Page 2

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