Lennox G26 Series

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Page 38

B−Wiring Diagram G26

(−3 & −4 Shown)

Main Page

G26 Series Units1
G26 Furnacey Ag26 Heat Exchange Assembly1
Combustion Process1
Service Literature1
Specifications2
Blower Performance Data4
Filter Air Resistance4
G26Q2-50 Blower Performance5
G26Q3-50 Blower Performance5
G26Q3-75 Blower Performance5
G26Q4/5-75 Blower Performance5
G26Q3/4-100 Blower Performance6
G26Q4/5-100 Blower Performance6
G26Q3/4-125 Blower Performance6
G26Q4/5-125 Blower Performance6
INTAKE and EXHAUST PIPE VENTING TABLE7
Gas Pipe Capacity7
G26−3 through −6 Components8
G26 Heat Exchanger9
G26 General Parts Orientation9
Make-Up Box Installation10
Unit Components10
Make-Up Box10
Control Box Components10
Outside Installation10
Control Transformer11
Circuit Breaker11
Door Interlock Switch11
Flame Sensor11
Surelight Control Board12
Surelight Ignitor12
Diagnostic Codes12
Electrostatic Discharge (Esd)13
Precautions and Procedures13
Fan Time Control13
Fan-Off Time Adjustment13
Combustion Air Blower14
Primary Limit Control14
Rollout Switch (S47)14
BCC2−3 Blower Control A1514
G26 Blower Control - Bcc2-3 (A15)15
Ignition Control15
Ignition Control A3 Terminal Designations15
Diagnostic LED16
Johnson G776 Ignition Control Operation16
Pilot, Spark Electrode, Flame Sensor16
Typical Burner Pilot/Electrode Orientation17
Gas Valve17
100% Sealed Combustion17
Differential Pressure Switch (S64)18
Normal Operation18
Differential Pressure Switch Circuitry18
Measuring Pressure Differential19
Placement and Installation20
PVC Joint Cementing Procedure20
Venting Considerations20
Intake Piping21
Exhaust Piping21
Removal of Unit from Common Venting System21
Intake and Exhaust Piping Terminations21
Front View24
Condensate Piping26
Condensate Assembly26
Condensate Plumbing26
Condensate Removal Process27
Detail of Cold Header Condensate Trapb27
Start-Up28
Preliminary and Seasonal Checks28
Heating Start-Up28
How to Operate Gas Valve28
Heating System Service Checks29
Safety or Emergency Shutdown29
Extended Period Shutdown29
A.G.A./C.G.A. Certification29
Testing Gas Supply Pressure30
Check Manifold Pressure30
Left Side Piping30
Right Side Piping30
Proper Gas Flow (Approximate)31
High Altitude Derate31
Flame Signal31
To Measure Flame Signal31
Typical Operating Characteristics32
Blower Operation and Adjustment32
Temperature Rise32
External Static Pressure32
Blower Speed Taps Leaded Motors33
Maintenance33
Filters33
To Remove Blower33
Cleaning Heat Exchanger and Burners34
Cleaning the Burner Assembly35
Burner Access/Removal35
Supply Air Blower36
Electrical36
Intake and Exhaust Lines36
Insulation36
Wiring Diagram, Sequence of Operation &Troubleshooting37
Field Wiring, Thermostat Connections37
Wiring Diagram G2638
Heating Sequence of Operation Surelight Control39
Normal Heating Mode39
Abnormal Heating Mode39
Cooling Sequence of Operation Surelight Control41
Continuous Low Speed Fan Sequence of Operation Surelight Control42
Heating Sequence of Operation42
Surelight Control Trouble Shooting Guide43
Unit Fails to Operate in the Cooling, Heating, or Continuous Fan Mode44
Control Signals Low Flame Sense During Heating Mode48
Rf Static During Time for Ignition48
G26 −1 and −2 Models49
BCC2 Blower Control −1 and −2 Models50
Bcc2 Troubleshooting Flowchart50
G776 Ignition Control Troubleshooting51
No Spark and System will Not Work52
Pilot Lights but Main Valve will Not Come on53

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