I would take the aquastat out and fun a 2nd red wire to the new thermostat and run a green wire to the thermostat... just take 2 wires jump the red on the old one to the red one on the new one and take the green wire 9on the old one) and put a jumper wire to the white on the new thermostate... This is how I have done it for years.. make sure you shut the power of to the air cond. I will be on tommorow so if you still dont get it i will give you my cell number. we will get it working.
Jack
Jack