Just bought the Lennox blower control board replacement kit - 31M73

I'm stuck on wiring the transformer---

The five wires coming out of the transformer going to the old board are -
Yellow - common
Blue - 24 vac
Orange-L2 XFMER Primary
Black - L1 XFMER Primary
Red - PARK

Directions say - 'Connect transformer 24 volt power wires to terminals R and C (XFRMR) on replacement control board.'
What wires go to R and C??

I know where L1 and L2 are going. But the directions don't say anything about the red PARK wire. What does PARK mean, and where might it go??

---confused

Connect the red and blue to R and C on the circuit board. Not familiar with ''PARK''. Likely the yellow is a center tap unused in your application. If you have a multimeter, you might verify the resistance between the blue and red is the sum of the yellow to each one.