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KGB-074 Two-Stage Units
1. First-stage cooling demand Y1 and G is ener
gized by the thermostat. G energizes blower.
2. Relay K239 directs voltage through relay K250 to
energize contactor K3.
3. Blower contactor K3 energizes blower B3 on low
speed.
4. Second-stage cooling demand Y2 energizes
relay K250 to redirect voltage to contactor K37
5. Contactor K37 energizes blower B3 on high
speed.
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