page 94 Input Voltage Measurements and fault isolation checks
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page 96 con't
page 97 diagram for typical packaged heating/cooling unit
page 98 Fault Isolation tree diagram for typical heating/cooling unit
page 99 Procedure overview | instrument or device required
page 100 Input voltage and current measurement procedures (steps 1-3)
page 101 Single-phase and 3-phase input voltage measurement diagrams
page 102 Fuse and circuit breaker measurement procedures (steps 4-9)
page 103 Fuse and circuit breaker measurement procedures diagrams
page 104 Thermostat checks and measurement procedure (steps 10-15)
page 105 Thermostat checks diagrams
page 106 Control tranformer measurement procedure (steps 16 and 17)
page 107 Control transformer voltage measurements diagram
page 108 Component fault isolation checks and resistive/inductive load and switching device measurements
page 109 con't
page 110 con't
page 111 Procedure overview | instrument or device required
page 112 Resistive and inductive load measurement procedures (steps 1-4)
page 113 Resistive load and inductive load resistance measurements diagrams
page 114 Switch/switched contacts resistance measurement procedure (steps 5 and 6) | diagram of same
page 115 Compressor checks and electricl measurements
page 116 con't
page 117 con't
page 118 con't
page 119 con't
page 120 con't
page 121 Procedure overview
page 122 Instrument or device required | Start relay checks and measurement (steps 1-3)
page 123 Start relay checks and measurements diagram
page 124 Start/run capacitor measurement procedure (steps 4-8)
page 125 Start/run capacitor measurements diagrams
page 126 Compressor motor open or shorted winding measurement procedure (steps9-11)
page 127 Compressor motor open or shorted winding measurements diagrams
page 128 Compressor motor grounded winding measurement procedure (step 12) | diagram of same
page 129 Single-phase compressor motor winding-to-winding resistance measurement procedure (step 13) | diagram of same
page 130 3-phase compressor motor winding-to-winding resistance measurement procedure (step 14)
page 131 3-phase compressor motor winding-to-winding resistance measurements diagram
page 132 Identifying unmarked single-phase PSC and CSR motor terminals measurement procedure (steps 15-18)
page 133 Identifying unmarked single-phase PSC and CSR motor terminals diagrams
page 134 3-phase compressor cureent impalance measurement procedure (steps 19 and 20)
page 135 3-phase compressor cureent impalance measurements diagram
page 136 Restarting a "stuck" PSC compressor procedure (steps 21-24)
page 137 Restarting a "stuck" PSC compressor diagram
page 138 Restarting a "stuck" 3-phase compressor procedure (steps 25-28)
page 139 Restarting a "stuck" 3-phase compressor diagrams
page 140 PTC start thermistor measurement procedure (steps 29-32)
page 141 PTC start thermistor measurement diagrams
page 142 Motor checks and electrical measurements (excluding compressor motors)
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page 144 con't
page 145 Procedure overview
page 146 Instrument or device required | Run capacitor measurement procedure (steps 1-5)
page 147 Run capacitor measurements diagrams
page 148 Motor open, shorted, or grounded circuit measurement procedure (steps 6-9)
page 149 Motor open, shorted, or grounded winding measurements diagrams
page 150 Furnace thermocouple and flame rectification sensor measurement
page 151 Procedure overview
page 152 Instrument or device required | Thermocouple voltage measurement procedure (steps 1-3)
page 153 Thermocouple voltage measurements diagrams
page 154 Flame rectification circuit flame-proving signal measuremnt procedure (steps 4-6)
page 155 Flame rectification circuit flame-proving signal measuremnt diagram
page 156 Fault Isolation methods used with non-repairable electronic controls
page 157 Procedure overview | Instrument or device required
page 158 Fault isolation of non-repairable electronic controls (steps 1-3)
page 159 Fault isolation of non-repairable electronic controls (step 4) | diagram of same
Equipment functional circuits - pg 94
Example of the Hopscotch method of troubleshooting - pg 108
Example of Hopscotch troubleshooting in circuit with open contactor contacts - pg 108
Example of Hopscotch troubleshooting in circuit with faulty load device - pg 109
Resistive loads, inductive loads, and contactor/relay switched contacts - pg 109
Schematic and wiring diagram contactor/relay switched contact symbols - pg 110
Capacitor discharging tool - pg 111
Hermetic and semi-hermetic compressors - pg 115
Seized compressor - pg 115
Capacitance-boosting PSC compressor motor - pg 116
Low capacity check - pg 116
Hermetic compressor leaks - pg 117
Internal line break overload - pg 117
Permanent split capacitor (PSC) motor schematic - pg 118
Capacitor start-capacitor run motor schematic - pg 118
3-phase motor - pg 118
Typical run and start capacitors - pg 119
CSR motro with voltage-actuated start relay - pg 120
PSC compressor motor with PTC start thermistor - pg 120
Typical HVAC motors - pg 142
Internal overload - pg 142
Multi-speed motor circuit - pg 143
Electronically-commutated motor (ECM) - pg 143
3-phase motor - pg 144
Typical run capacitor - pg 145
Thermocouple standing pilot - pg 150
Thermocouple testing - pg 150
Testing flame-proving signal - pg 151
Typical microprocessor furnace control system - pg 156
Schematic of microprocessor-controlled furnace - pg 156