EBOOK - HVAC Troubleshooting Guide (Rex Miller)


EBOOK - Hướng dẫn khắc phục các sự cố hệ thống HVAC (Rex Miller) - 719 Trang.

The value of a troubleshooting guide increases when it is available and needed. The format of this book will allow you to locate information quickly. The material reflects recent changes in the field of refrigeration and air-conditioning.

The purpose of the book is to aid you in your everyday tasks and keep you current with some of the latest facts, figures, and devices in this important trade. It is truly a portable library for use on the job, on the reference shelf in the shop, in your pocket, or in the toolbox.
Many tables, charts, and illustrations are included. They show a variety of parts and techniques often found in present-day practice in the field. Obviously, not all related problems can be presented here, since there is a great deal of ingenuity required by the worker on the job. For standard procedures, however, the ASHRAE Handbook gives the numbers and sizes of various types of equipment that is safe to install in a
given location.

CONTENTS:

Chapter 1. Tools and Instruments 1
Tools and Equipment  1
Pliers and clippers 1
Fuse puller 2
Screwdrivers 2
Wrenches 2
Soldering equipment 3
Drilling equipment 4
Knives and other insulation-stripping tools 6
Meters and test prods 8
Tool kits 9
Gages and Instruments 11
Pressure gages 13
Gage selection 14
Line pressure 15
Effects of temperature on gage performance 18
Care of gages 18
Gage recalibration 19
Thermometers 20
Pocket thermometer 20
Bimetallic thermometer 22
Thermocouple thermometer 25
Resistance thermometer 25
Superheat thermometer 26
Superheat Measurement Instruments 27
Halide Leak Detectors 31
Setting up 32
Lighting 33
Leak testing the setup 34
Adjusting the flame 34
Detecting leaks 34
Maintenance 35
Electrical Instruments 35
Ammeter 36
Voltmeter 38
Ohmmeter 40
Multimeter 41
Wattmeter 42
Other Instruments 43
Air-filter efficiency gages 43
Air-measurement gages 44
Humidity-measurement instruments 44
Stationary psychrometers 45
Moisture analyzers 46
Btu meters 46
Vibration and sound meters 46
Service Tools 46
Special Tools 48
Vacuum Pumps 50
Vacuum pump maintenance 53
Vacuum pump oil problems 53
Operating instructions 54
Evacuating a system 54
Charging Cylinder 56
Charging Oil 57
Changing Oil 57
Mobile Charging Stations 57
Tubing 58
Soft copper tubing 59
Hard-drawn copper tubing 60
Cutting copper tubing 62
Flaring copper tubing 63
Constricting tubing 65
Swaging copper tubing 66
Forming refrigerant tubing 67
Fitting copper tubing by compression 68
Soldering 69
Soft soldering 69
Silver soldering or brazing 71
Testing for Leaks 72
Cleaning and Degreasing Solvents 72
New and Old Tools 74
Chapter 2. Heat Pumps and Hot-Air Furnaces 77
Hot-Air Furnaces 77
Basic Gas Furnace Operation 78
Basic Electric Heating System 79
Basic operation 79
Ladder Diagrams 80
Manufacturer’s Diagrams 82
Field Wiring 84
Low-Voltage Wiring 84
Thermostat location  86
Printed circuit board control center  87
Contents ix
Heat Pumps 87
Operation 90
Special requirements of heat-pump systems 93
Heat-pump combinations 93
High-Efficiency Furnaces 94
Operation 94
Electrical controls 95
Sequence of operation 96
Combustion process 96
Troubleshooting the Lennox Pulse Furnace 97
Chapter 3. Ventilation Requirements 105
Air Leakage 106
Natural Ventilation 106
Wind forces 106
Temperature-difference forces 108
Combined wind and temperature forces 108
Roof ventilators 108
Ventilator capacity 109
Fresh-Air Requirements 109
Mechanical Ventilation 111
Volume of air required 111
Duct-system resistance 111
Air Filtration 112
Effect of dust on health 112
Various dust sources 113
Air-Filter Classification 113
Dry filters 114
Wet (or viscous) filters 115
Filter Installation 117
Humidity-Control Methods 119
Humidifiers 119
Air-washer method 119
Pan humidifiers 120
Electrically operated humidifiers 121
Air-operated humidifiers 122
Dehumidifiers 123
Electric dehumidification 123
Controls 124
Adsorption-type dehumidifiers 125
Air-Duct Systems 126
Heat gains in ducts 127
Resistance losses in duct systems 132
Fans and Blowers 133
Air volume 137
Horsepower requirements 137
Drive methods 138
Fan selection 139
Fan applications 139
Fan operation 140
...

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