First…love your ductwork and equipment layout…nice job!
I am having a little trouble following your wiring and will make some suggestions about some things at another time.
This is the image that was on the link you posted:
So I draw your attention to the label which reads OUTPUT: 5V 6.5A
Just confirm yours reads 24V ?A because even when I zoom in on the image you posted I cannot read that.
Then it does appear that you have Blue connected to the Top Left terminal which is -V and the Brown is connected to the Top third from Left terminal which is +V.
Can you confirm that but I think I can see that clear enough?
Then you have run the blue and brown 24VDC to your distribution terminals and then out the bottom (following your colour coding) with blue connected to the A2 terminal on the relay while the brown is first switched by your onboard relay and then connected to the A1 terminal on the relay. That all looks to be as is required and can’t fault the circuit from what I can see. Nice job!