AAON WHA-018 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-018 Specifications

General

Model	WHA-018
Category	Heat Pump
Manufacturer	AAON
Cooling Capacity (BTU/h)	18, 000
Phase	1
Compressor Type	Scroll
Refrigerant	R-410A
Airflow (CFM)	700
HSPF Rating	9.0

Summary

AAON WH Series Features and Options Introduction

Safety Precautions and Warnings

General Safety Guidelines

General safety precautions, warnings, and cautions for unit operation and maintenance.

WSHP Feature String Nomenclature

General Unit Information

Unit Description and Capabilities

Details about AAON WH Series WSHP units, their design, and intended use.

Codes and Compliance Standards

Compliance and Standards

Information on unit testing, ETL certification, and system sizing standards.

Unit Installation Procedures

Wiring Diagrams Location

Location and reference for unit-specific wiring diagrams.

Unit Placement and Mounting

Guidelines for proper unit placement, mounting, and vibration isolation.

Condensate Drain Piping Installation

Requirements for installing p-traps and drain lines for condensate removal.

Blower Assembly and Motor Access

Procedures for accessing and removing blower assembly, motor, and fan.

Discharge Modification and Unit Handling

Procedures for discharge modification, lifting, and handling the unit.

Bottom Access Panel Procedures

Steps to access components via the horizontal unit bottom access panel.

Heat Exchanger Water Piping

Details on water piping for the refrigerant-to-water heat exchanger.

Electrical Connections and Safety

Nameplate Voltage and Wiring

Understanding nameplate voltage markings and basic wiring.

Disconnect Switch Wiring

Instructions for connecting the unit to the disconnect switch.

Thermostat Control Wiring

Guidelines for wiring thermostat controls to the unit.

Unit Startup Procedures

Operation Limits and Fan Checks

Startup limits and checks for supply fans.

Fan Air Flow Adjustment

Procedures for adjusting fan airflow at startup.

Refrigerant Charge Adjustment

Steps for adjusting the system's refrigerant charge.

Unit Operation and Control

Pioneer Silver Controller

Description and specifications of the Pioneer Silver Controller.

Sequences of Operation Modes

Detailed operational sequences for various unit functions.

Unit Alarms and Fault Codes

Information on unit alarms, fault codes, and their meanings.

Pioneer Silver Expansion Board

Details on the Pioneer Silver Expansion Board and its functions.

Dip Switch Configuration

Settings for fan-speed dehumidification and waterside economizer.

Maintenance and Troubleshooting

DX Cooling System Checks

Checks for the unit in cooling mode operation.

Condensate Drain Pan Cleaning

Procedures for cleaning condensate drain pans.

Supply Fan and Coil Maintenance

Inspection and cleaning of supply fans and microchannel coils.

Filter Inspection and Replacement

Recommendations for monthly filter inspection and replacement.

Ordering Replacement Parts

Filter Specifications and Sizes

Heat Exchanger Corrosion Resistance Appendix

WH Series Startup Checklist and Forms

Pre Startup Checklist Items

Contractor checklist for unit installation and readiness.

Ambient Conditions Recording

Recording ambient dry bulb and wet bulb temperatures.

Component Startup Checks

Startup checks for fans, compressors, refrigeration, and water systems.

Maintenance Log Entry

Log for recording service, repairs, and adjustments.

Literature Change History