AAON WHA-009 User Manual

WH Series
Horizontal Water-Source Heat Pump Unit
Installation, Operation
& Maintenance
If the information in this manual is not
followed exactly, a fire may result
causing property damage, personal
injury, or loss of life.
WARNING
QUALIFIED INSTALLER
Improper
installation, adjustment,
alteration, service,
or maintenance
can cause property damage,
personal injury or loss of life. Startup
and service must be performed by a
Factory Trained Service Technician.
Keep a copy of this IOM with the unit.
WARNING

AAON WHA-009 Specifications

General

Brand	AAON
Model	WHA-009
Category	Heat Pump
Language	English

Summary

Safety

General Safety Precautions

Notes and cautions regarding unit operation, installation, and maintenance for safety.

Electrical and Handling Hazards

Warnings about electrical shock, fire hazards, and proper unit handling procedures.

System-Specific Warnings

Cautions related to grounding, rotating components, water freezing, and pressure.

General Information

Codes and Ordinances

Details compliance with industry standards, building codes, and electrical safety regulations.

Receiving Unit

Instructions for inspecting the unit upon delivery for damage and verifying correct model.

Storage

Guidelines for storing the unit in a dry, protected area to prevent damage before installation.

Direct Expansion (DX) Systems

Information about factory-assembled DX systems, including components and control recommendations.

Installation

Wiring Diagrams

Location of unit-specific wiring diagrams for electrical connections and troubleshooting.

Locating the Unit

Guidance on optimal unit placement relative to ductwork, electrical, and plumbing.

Condensate Drain Piping

Requirements for installing a p-trap and drain line, including pitch and air breaks.

Blower Assembly Removal – Side Access

Step-by-step procedure for safely removing the blower assembly from the side.

Discharge Modification

Instructions on how to modify the unit's discharge direction if needed.

Lifting and Handling the Unit

Procedures and precautions for safely lifting and moving the unit.

Horizontal Unit Bottom Access

Explains how to access components through the optional bottom access panel.

Blower Assembly Removal – Bottom Access

Step-by-step procedure for safely removing the blower assembly from the bottom.

Blower Motor and Fan Access

Guidance on accessing and removing the blower motor and fan for service.

Refrigerant-to-Water Heat Exchanger Water Piping

Details on water piping for the heat exchanger, including corrosion warnings.

Startup

Operation Limits

Table specifying minimum and maximum operating limits for cooling and heating modes.

Fan Air Flow Adjustment

Procedures for adjusting fan speed to meet specific airflow requirements at startup.

Adjusting Refrigerant Charge

Critical steps for adjusting refrigerant charge, including sub-cooling and superheat measurements.

Operation

AAON WSHP Pioneer Silver Controller

Details the features, specifications, and wiring of the Pioneer Silver Controller.

AAON WSHP Pioneer Silver Expansion Board

Describes the function and connections of the expansion board for enhanced controller capabilities.

Maintenance

DX Cooling Checks

Procedures for checking the unit in cooling mode, including fans, compressor, and voltage.

Condensate Drain Pans

Importance of periodic cleaning to prevent microbial growth and blockages.

Supply Fan Maintenance

Instructions for inspecting and cleaning blower wheels to prevent vibration and failure.

Microchannel Coil Cleaning

Procedures and recommended chemicals for cleaning microchannel coils effectively.

Filter Replacement

Recommendation for monthly filter inspection and replacement for optimal efficiency.

Appendix A - Heat Exchanger Corrosion Resistance