Standard AC Wiring Diagrams update

Wire Size: 18 Gauge
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Standard AC with Variable Speed Air Handler
Control Wiring (No Heat)
Variable Speed Air Handler
Standard Thermostat
Standard A/C Condenser
24 Volt+
Fan Only Operation
Common
1st Stage Heat (White)
AC Reversing Valve
1st Stage AC
2nd Stage AC
2nd Stage Heat
AC Contactor
O
6
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.
NOTES
Some AC Systems will have a blue wire with a pink stripe in place of the yellow or Y wire.
**Refer to the blower chart for CFM requirements. Jump if needed to achieve correct CFM.
*Place a jumper connecting Y1 and O.
**
*
Y2
Y2
Y1
O
NOTE
(see below)
Y1
W1
W1
W1