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Bard WH421 User Manual

Bard WH421
23 pages
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WALL MOUNTED
PACKAGE HEAT PUMPS
MODELS:
WH421
WH483
WH602
INSTALLATION INSTRUCTIONS
Manual: 2100-399
Supersedes:
File: Volume III Tab 17
Date: 03-01-02
BARD MANUFACTURING COMPANY
Bryan, Ohio 43506
Since 1914...Moving ahead, just as planned.
Copyright 2002

Table of Contents

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Bard WH421 Specifications

General IconGeneral
BrandBard
ModelWH421
CategoryHeat Pump
LanguageEnglish

Summary

Related Information and Publications

National Electrical Code Standard

Information on National Electrical Code standards relevant to installations.

HVAC Installation Standards

Standards for installation of air conditioning and ventilating systems.

Warm Air Heating Standards

Standards for warm air heating and air conditioning systems.

Residential Load Calculation

Methods for load calculation in residential air conditioning.

Duct System Design Guidelines

Guidance on designing low-pressure duct systems.

HVAC Standards Publisher Contacts

Contact details for organizations providing HVAC standards.

Wall Mount Unit General Information

Model Nomenclature Explained

Explains the coding system for wall-mount heat pump models.

Unit Installation Instructions

Wall Mounting Procedures

Procedures and considerations for mounting the unit to the wall.

Securing the Unit to the Wall

Specific steps for securing the unit using brackets and fasteners.

Common Installation Scenarios

Common installation scenarios and configurations for wall-mount units.

Main Power Wiring

Guidance on sizing and connecting the main power supply to the unit.

Low Voltage Wiring

Instructions for low voltage connections, including thermostat wiring.

Thermostat Specific Wiring

Specifics on thermostat wiring, compressor cutoff, and heat anticipation.

Thermostat Indicator Lamp Functions

Explains the function of indicator lamps on the thermostat.

Emergency Heat Operation

Describes how to manually set the system to emergency heat.

Compressor Malfunction Indicator

Explains the compressor malfunction indicator and its causes.

Unit Start Up Procedures

Installer Start-Up Advice

Advice for improving start-up performance of the unit.

Crankcase Heater Function

Information on crankcase heaters and their importance for compressor protection.

High Pressure Switch Operation

Details on the remote reset high pressure switch and its function.

Three-Phase Compressor Start-Up

Specific start-up procedures for three-phase scroll compressors.

Phase Monitor Functionality

Explains the function of the phase monitor for three-phase units.

General Service Hints

Provides general advice for servicing the unit and maintaining performance.

Unit Sequence of Operation

Describes how the unit operates in cooling and heating modes.

Pressure Service Port Usage

Information on locating and using pressure service ports for system checks.

Defrost Cycle Operation

Explains the operation and control of the defrost cycle in heat pump mode.

Troubleshooting Guide

Heat Pump Control Troubleshooting

Step-by-step procedure for troubleshooting the heat pump control.

Temperature Sensor Check

Instructions for checking the outdoor unit temperature sensor's resistance.

Component Data and Service Procedures

Fan Blade Setting

Specifies correct fan blade settings for optimal air delivery.

Fan Shroud Removal

Provides step-by-step instructions for fan shroud removal and reinstallation.

Refrigerant Charge Guidelines

Details correct system R-22 charge and suction line temperatures.

Maximum ESP Data

Data on maximum external static pressure for unit operation.

Cooling Pressure Specifications

Tables showing cooling pressures at various temperatures and conditions.

Heating Pressure Specifications

Tables showing heating pressures at various temperatures and conditions.

Available Optional Accessories

Lists available optional accessories for the unit.

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