York YVAG012 - User Manual

Questions and Answers

D
Debra CooperAug 7, 2025
What to do if York YVAG012 shows “High Discharge Pressure or Compressor Overload” fault?
- J
  Jesse NormanAug 7, 2025
  If your York Inverter displays a “High Discharge Pressure or Compressor Overload” fault, several issues could be the cause. Start by checking the condenser fans to ensure they are functioning correctly and blowing air in the right direction. Also, too much refrigerant can cause this issue, so have some removed. Additionally, air in the refrigerant system, a defective discharge pressure switch, a locked compressor motor, or an open compressor internal motor protector could be the culprits. In the last case, verify refrigerant charge, superheat setting, compressor rotation and if the compressor is overloaded.
K
karenrichardsonAug 14, 2025
What to do if York Inverter shows “Low Suction Pressure” Fault?
- K
  Kurt RodgersAug 14, 2025
  If your York Inverter displays a “Low Suction Pressure” fault, several things could be wrong. It might be due to a low refrigerant charge, which would require you to repair any leaks and add refrigerant. The BPHE could be fouled or clogged, needing a cleaning. Also, check the EEV wiring or consider replacing the EEV if it's defective. Reduced chilled liquid flow, a defective suction pressure transducer/low pressure switch or wiring, or non-operating fans (in heating mode) could also be the cause. In the case of reduced chilled liquid flow, check the liquid flow rate, pump operation, clean the pump strainer and purge the chilled liquid system of air. If the fans are not operating, check the fan wiring and communication.
S
Samantha SmithAug 21, 2025
What to do if York YVAG012 shows “Chiller Water Flow” Fault?
- S
  Shane IrwinAug 21, 2025
  If your York Inverter displays a “Chiller Water Flow” Fault, it could be due to several reasons. First, check the chilled liquid flow. Second, too much air in the piping system can cause this, so purge the air through a release valve. Third, ensure the flow switch is installed correctly according to the manufacturer’s instructions. Lastly, the flow switch itself might be defective and need replacement.
B
Bruce OrtegaAug 29, 2025
Why York YVAG012 has no display on wire controller and won't operate?
- W
  William GravesAug 29, 2025
  If your York Inverter wire controller has no display and the unit won't operate, there could be a few reasons. First, there might be no power from the microboard to the 12VDC wire controller, so check the microboard power supply and wiring. Second, there might be no 230VAC to the microboard, so check the power supply and wiring to the microboard. Third, the communication wire between the wire controller and the unit might be defective, so check the communication wiring and contact YORK Service before replacing circuit boards!

Summary

General Safety Guidelines

Safety Symbols

Explains symbols used in the document to alert readers to specific situations.

Product Description

Introduction

Overview of the YORK DC Inverter Air-Cooled Chiller and Heat Pump units.

Basic Unit Nomenclature

Explains the naming convention and component parts of the unit.

Unit Dimensional Data

Provides dimensional drawings and data for the YVAG012-018 models.

Operating Range

Voltage Range

Specifies acceptable supply voltage fluctuations and phase unbalance.

Temperature Ranges

Details operating temperature ranges for components and conditions.

Installation Requirements

Inspection

Instructions for inspecting the unit for transit damage and completeness.

Moving the Unit

Guidelines for safely lifting and moving the unit using appropriate equipment.

Inspection Checklist

Lists essential checks to be performed before placing units into operation.

Handling

Advice on careful handling of completely assembled units during shipping.

Unit Location

Cold Climate Installation Considerations

Recommendations for operating units in low ambient temperatures and snow.

Unit Foundation Requirements

Requirements for a stable, flat, and level foundation for unit installation.

Roof Location Installation

Considerations for installing the unit on a roof, including structural support.

Optional Vibration Isolators

Recommendations for using vibration isolators to minimize sound and vibration transmission.

Unit Drainage and Condensate Management

Drainage Way (012~018 Models)

Details drain hole specifications and connection for YVAG012-018 models.

Drainage Way (020~040 Models)

Instructions for adding a water pond and pipeline for YVAG020-040 models.

Unit Installation Clearance and Spacing

Compressor Mounting

Information on how the compressor is mounted using isolators.

Installation Clearances

Specifies required clearances around the unit for airflow and servicing.

Installation Space Diagram

Chilled Water System Installation

Chilled Liquid Piping Specification

General specifications and considerations for chilled water piping installation.

Chilled Liquid Piping Installation

Specific installation instructions and considerations for chilled water pipelines.

Piping Specification

Details pipe specifications for galvanized steel and PP-R pipes.

Water System Pipework Arrangement

Chilled Water System for Single Unit

Illustrates pipework for single unit systems without/with external pumps.

Chilled Water System for Modular Unit

Modular Connections

Side by Side Layout

Illustrates the side-by-side layout for connecting multiple units.

Back By Back Layout

Illustrates the back-by-back layout for connecting multiple units.

System Leaving Water Temperature Sensor

Buffer Water Tank

Expansion Tank (Pot)

Water Treatment

Unit External Head

Unit Electrical Connections

Field Wiring

Guidelines for providing power wiring and selecting appropriate conductors.

Alarm Status Contacts

Description of normally-open contacts for unit fault status indication.

Remote Switch Contacts

How to wire dry contacts for remote unit start/stop functions.

Remote C;H Switch

How to wire dry contacts for remotely switching operating modes (Cooling/Heating).

External Interlock

Function and wiring of the external interlock for emergency cutoff.

Compressor Heater

Information on the standard compressor heaters and their operation.

Pressure Cutout

Details the high pressure cutout switch operation and setpoints.

Safety Precautions

Important safety items to comply with during installation and operation.

Accessory Dimensions

Provides dimensions for specific accessory components like valves.

Electrical Continuity and Safety

Electrical Connection

Details factory wiring and requirements for field wiring connections.

Safety Precautions

Important safety precautions related to electrical installation and maintenance.

Electrical Wiring Diagrams

Wire Controller Installation

Step-by-step guide for wiring the wire controller to the unit.

Communication Cable Connection

Communication Cable Specification

Specifies the type and length requirements for communication cables.

Unit Power Supply Specifications

Unit Power Supply Specification

Details power supply cable specifications based on model type.

System Power Supply Distribution

Diagram illustrating system power supply distribution for multiple units.

Single Unit Wire Diagram

Shows the wiring diagram for a single unit's power supply connection.

Air Side Terminal Connect

Electrical Schematic Diagram

Wire Controller Usage and Interface

Interface

Explains the layout and areas of the wire controller's touch screen interface.

Wire Controller Basic Operations

Start and Stop the Unit

Instructions on how to start and stop the unit using the controller screen.

Operating Mode

How to set or switch between cooling and heating operating modes.

Liquid Temperature Setpoint

How to adjust target liquid temperatures using the UP/DOWN keys.

Wire Controller Advanced Operations

Date and Time Setting

Steps to set the date and time on the controller.

Schedule Timer Setting

Instructions for setting up scheduled operation times for the unit.

Parameter Setting

How to access and adjust system and module parameters.

Fault Diagnosis

How to access and view fault codes and their details.

Running Status

Fault Reset

Keylock Function

Pump Circulation

Low Sound Mode

Manual Defrost

Periodic Unit Maintenance

Important Notes

States owner's responsibility for maintenance and YORK's warranty limitations.

Compressor Maintenance

Information on the type of oil used and checks during maintenance.

Add Tropical Preheating

Notes on compressor preheating for start-up in air conditioning units.

Condenser Coils Cleaning

Recommendations for cleaning condenser coils to maintain efficiency.

Operating Parameters Check

Importance of regular checks on operating temperatures and pressures.

Condenser Fan Motors

Condenser fan motors are permanently lubricated and require no maintenance.

Overall Unit Inspection

Guidelines for periodic overall unit inspections to ensure proper operation.

Modbus Communication Protocol

System Troubleshooting Guide

Wire Controller Display and Operation Issues

Solutions for wire controller display issues and unit non-operation.

Chiller Water Flow Fault

Troubleshooting steps for chiller water flow faults.

Low Suction Pressure Fault

Troubleshooting steps for low suction pressure faults.

High Discharge Pressure or Compressor Overload

Troubleshooting steps for high discharge pressure or compressor overload.

Low Leaving Water Temp Fault

Troubleshooting steps for low leaving water temperature faults.

Compressor Start Failure

Troubleshooting steps when the compressor fails to start.

Fan Protection Issues

Troubleshooting steps for fan protection issues.

Cooling or Heating Effect Issues

Troubleshooting steps for insufficient cooling or heating effect.

Summary

General Safety Guidelines

Safety Symbols

Explains symbols used in the document to alert readers to specific situations.

Product Description

Introduction

Overview of the YORK DC Inverter Air-Cooled Chiller and Heat Pump units.

Basic Unit Nomenclature

Explains the naming convention and component parts of the unit.

Unit Dimensional Data

Provides dimensional drawings and data for the YVAG012-018 models.

Operating Range

Voltage Range

Specifies acceptable supply voltage fluctuations and phase unbalance.

Temperature Ranges

Details operating temperature ranges for components and conditions.

Installation Requirements

Inspection

Instructions for inspecting the unit for transit damage and completeness.

Moving the Unit

Guidelines for safely lifting and moving the unit using appropriate equipment.

Inspection Checklist

Lists essential checks to be performed before placing units into operation.

Handling

Advice on careful handling of completely assembled units during shipping.

Unit Location

Cold Climate Installation Considerations

Recommendations for operating units in low ambient temperatures and snow.

Unit Foundation Requirements

Requirements for a stable, flat, and level foundation for unit installation.

Roof Location Installation

Considerations for installing the unit on a roof, including structural support.

Optional Vibration Isolators

Recommendations for using vibration isolators to minimize sound and vibration transmission.

Unit Drainage and Condensate Management

Drainage Way (012~018 Models)

Details drain hole specifications and connection for YVAG012-018 models.

Drainage Way (020~040 Models)

Instructions for adding a water pond and pipeline for YVAG020-040 models.

Unit Installation Clearance and Spacing

Compressor Mounting

Information on how the compressor is mounted using isolators.

Installation Clearances

Specifies required clearances around the unit for airflow and servicing.

Installation Space Diagram

Chilled Water System Installation

Chilled Liquid Piping Specification

General specifications and considerations for chilled water piping installation.

Chilled Liquid Piping Installation

Specific installation instructions and considerations for chilled water pipelines.

Piping Specification

Details pipe specifications for galvanized steel and PP-R pipes.

Water System Pipework Arrangement

Chilled Water System for Single Unit

Illustrates pipework for single unit systems without/with external pumps.

Chilled Water System for Modular Unit

Modular Connections

Side by Side Layout

Illustrates the side-by-side layout for connecting multiple units.

Back By Back Layout

Illustrates the back-by-back layout for connecting multiple units.

System Leaving Water Temperature Sensor

Buffer Water Tank

Expansion Tank (Pot)

Water Treatment

Unit External Head

Unit Electrical Connections

Field Wiring

Guidelines for providing power wiring and selecting appropriate conductors.

Alarm Status Contacts

Description of normally-open contacts for unit fault status indication.

Remote Switch Contacts

How to wire dry contacts for remote unit start/stop functions.

Remote C;H Switch

How to wire dry contacts for remotely switching operating modes (Cooling/Heating).

External Interlock

Function and wiring of the external interlock for emergency cutoff.

Compressor Heater

Information on the standard compressor heaters and their operation.

Pressure Cutout

Details the high pressure cutout switch operation and setpoints.

Safety Precautions

Important safety items to comply with during installation and operation.

Accessory Dimensions

Provides dimensions for specific accessory components like valves.

Electrical Continuity and Safety

Electrical Connection

Details factory wiring and requirements for field wiring connections.

Safety Precautions

Important safety precautions related to electrical installation and maintenance.

Electrical Wiring Diagrams

Wire Controller Installation

Step-by-step guide for wiring the wire controller to the unit.

Communication Cable Connection

Communication Cable Specification

Specifies the type and length requirements for communication cables.

Unit Power Supply Specifications

Unit Power Supply Specification

Details power supply cable specifications based on model type.

System Power Supply Distribution

Diagram illustrating system power supply distribution for multiple units.

Single Unit Wire Diagram

Shows the wiring diagram for a single unit's power supply connection.

Air Side Terminal Connect

Electrical Schematic Diagram

Wire Controller Usage and Interface

Interface

Explains the layout and areas of the wire controller's touch screen interface.

Wire Controller Basic Operations

Start and Stop the Unit

Instructions on how to start and stop the unit using the controller screen.

Operating Mode

How to set or switch between cooling and heating operating modes.

Liquid Temperature Setpoint

How to adjust target liquid temperatures using the UP/DOWN keys.

Wire Controller Advanced Operations

Date and Time Setting

Steps to set the date and time on the controller.

Schedule Timer Setting

Instructions for setting up scheduled operation times for the unit.

Parameter Setting

How to access and adjust system and module parameters.

Fault Diagnosis

How to access and view fault codes and their details.

Running Status

Fault Reset

Keylock Function

Pump Circulation

Low Sound Mode

Manual Defrost

Periodic Unit Maintenance

Important Notes

States owner's responsibility for maintenance and YORK's warranty limitations.

Compressor Maintenance

Information on the type of oil used and checks during maintenance.

Add Tropical Preheating

Notes on compressor preheating for start-up in air conditioning units.

Condenser Coils Cleaning

Recommendations for cleaning condenser coils to maintain efficiency.

Operating Parameters Check

Importance of regular checks on operating temperatures and pressures.

Condenser Fan Motors

Condenser fan motors are permanently lubricated and require no maintenance.

Overall Unit Inspection

Guidelines for periodic overall unit inspections to ensure proper operation.

Modbus Communication Protocol

System Troubleshooting Guide

Wire Controller Display and Operation Issues

Solutions for wire controller display issues and unit non-operation.

Chiller Water Flow Fault

Troubleshooting steps for chiller water flow faults.

Low Suction Pressure Fault

Troubleshooting steps for low suction pressure faults.

High Discharge Pressure or Compressor Overload

Troubleshooting steps for high discharge pressure or compressor overload.

Low Leaving Water Temp Fault

Troubleshooting steps for low leaving water temperature faults.

Compressor Start Failure

Troubleshooting steps when the compressor fails to start.

Fan Protection Issues

Troubleshooting steps for fan protection issues.

Cooling or Heating Effect Issues

Troubleshooting steps for insufficient cooling or heating effect.

York YVAG012 Specifications

General

Brand	York
Model	YVAG012
Category	Inverter
Language	English

Related product manuals

York YVAG012 - User Manual

Table of Contents

Questions and Answers

Summary

General Safety Guidelines

Safety Symbols

Product Description

Introduction

Basic Unit Nomenclature

Unit Dimensional Data

Operating Range

Voltage Range

Temperature Ranges

Installation Requirements

Inspection

Moving the Unit

Inspection Checklist

Handling

Unit Location

Cold Climate Installation Considerations

Unit Foundation Requirements

Roof Location Installation

Optional Vibration Isolators

Unit Drainage and Condensate Management

Drainage Way (012~018 Models)

Drainage Way (020~040 Models)

Unit Installation Clearance and Spacing

Compressor Mounting

Installation Clearances

Installation Space Diagram

Chilled Water System Installation

Chilled Liquid Piping Specification

Chilled Liquid Piping Installation

Piping Specification

Water System Pipework Arrangement

Chilled Water System for Single Unit

Chilled Water System for Modular Unit

Modular Connections

Side by Side Layout

Back By Back Layout

System Leaving Water Temperature Sensor

Buffer Water Tank

Expansion Tank (Pot)

Water Treatment

Unit External Head

Unit Electrical Connections

Field Wiring

Alarm Status Contacts

Remote Switch Contacts

Remote C;H Switch

External Interlock

Compressor Heater

Pressure Cutout

Safety Precautions

Accessory Dimensions

Electrical Continuity and Safety

Electrical Connection

Safety Precautions

Electrical Wiring Diagrams

Wire Controller Installation

Communication Cable Connection

Communication Cable Specification

Unit Power Supply Specifications

Unit Power Supply Specification

System Power Supply Distribution

Single Unit Wire Diagram

Air Side Terminal Connect

Electrical Schematic Diagram

Wire Controller Usage and Interface

Interface

Wire Controller Basic Operations

Start and Stop the Unit

Operating Mode

Liquid Temperature Setpoint

Wire Controller Advanced Operations

Date and Time Setting

Schedule Timer Setting

Parameter Setting

Fault Diagnosis

Running Status