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LCD Wiring Diagram Presentation
42-2111-1-B / 42-2111-2-B
PowerOff-OnSwitch
120V Power Supply
Power SwitchON
24 Volt Transformer
Powered
Low Operator
Call for Heat
Pump Relay
Energized
PumpContactCloses
PumpEnergizes
FlowSwitchMakes
FanManagerEnergizes
FanContactCloses
Fan Energizedon Low Speed
Low AirPressure
Switch Makes
Pre-purgeRelay
Energizes
Low PilotGas Valve &
R7 RelayEnergized
R7ContactMakes
SparkGeneratorEnergizes
Flame RodSensesPilot
Gas ValveEnergized
on Low
R7 Relay Drops Out Via R8 Relay
R8ContactMakes
Safety Solenoid
Energizes
R7 ContactDrops Out
Spark
High OperatorCalls Second Stage
High Speed Blower Relay
Energizes
BlowerRamps to High
Speed
High Pressure Air Switch Makes
High Fire Relay
Energizes
Gas Valve Energized on
High
Pilot Valve Energized on
High
Loss of Pilot
Flame
Retry After 5- Min. Wait
Flame Safeguard in 10- Min. Wait
Alarm Contacts Close R1 Energizes
Unit Failed to
Light
R1ContactBreaks
R1ContactMakes
Fan Manager Times Out
Fan Drops Out
PressureSwitches
Break
Alarm Contacts
Open
Pilot IgnitionRetry
Successful
High FireEstablished
Call for Heat
Drops Out
Blower Post Purge Times Out
Pump Purge Times Out
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all of you in the near future:all of you in the near future:
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