Standard AC Wiring Diagrams update

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Standard AC with Standard Air Handler and Two
Stage Backup Heat Control Wiring
Standard Air Handler
Wire Size: 18 Gauge
Standard Single Stage Heat Thermostat
Standard A/C Condenser
AC Contactor
24 Volt+
Fan Only Operation
Common
Air Conditioning
1st Stage Heat (White)
2nd Stage Heat
5
Some AC Systems will have a blue wire with a pink stripe in place of the yellow or Y wire.
This diagram is to be used as reference for the low voltage control wiring of your heating and AC system. Always refer to your thermostat or equipment
installation guides to verify proper wiring.
NOTE