how do you wire in a photocell to a climate controller?

i'll be your huckleberry,

what makes you think that diagram is for on during the day?
photocells work to turn on when it's dark

so, i'd use diagram #1 on the pdf you posted
or

run it off a timer.. more better.. then you can vary the c02 delivery
 
but they can be wired to turn on during day.
i figured not to mess with the controller, and wire it into my cyclestat.
but following figure #6 isnt working for on during day???
 
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