AC Jr Programming Question

I have my AC Jr programmed to control my lights, chiller, etc.

I want the lights on the timer AND if the chiller kicks on, I want them off regardless of what time it is.

Essentially what I want this:

IF (Time >= On_Time) AND (Time <= Off_Time) AND (Chiller_State = OFF)
THEN Turn Light_1 ON
ELSE Turn Light_1 OFF

I had all my Light Timer Statements programmed in already.

I added the following:

IF Tmr CHL = ON THEN LT1 = OFF
IF Tmr CHL = ON THEN LT2 = OFF
IF Tmr CHL = ON THEN LT3 = OFF

But nothing turns off when the chiller trips on.

SO if my Light Logic is saying "ON", How do I set the "priority" to the chiller logic????

Thanks
Mark