I do not have eyes on the opener (commercial Opener) I don't have to hold down the wall button to get the door to close. I have never tried the remote this way. I have 4 wires that run to the wall switches ( Open Close and Stop)I know the HD unit will work on a different door. Opener is Raynor RBT-310 And I can not get the unit to work with out the use of diodes in line.
Ah, that raynor is an oldy. But, it is a simple unit. Does the inside on the lid have a schematic on it for the wiring? or a book inside the cover? I'm not sure, can't remember if this unit has an exterior radio connection on it. 1-2-3
on outside of case? if not, check the wiring schematic. your four wires coming from the button are open, stop, close, and common. Most times green open, blue close, red stop, and white common. Inside the unit where they hook up is not usually were the radio control would hook up. Schematic should show where to hook up wires from reciever. I'm asuming that the radio control has two wires coming out of it after being plugged into the outlet. these wires would connect to either numbers 1 and 2 on outside of unit, or two screw on the inside of unit that the schematic shows for radio control.
You may have to add a longer line to the two wires coming out of the radio and move it closer to the front of the opening, depending on how tall a commercial door we are talking about.
I may be telling you something you already know, not sure.
Wish I was there could clear it up for you.
Forget about the four wire two wire thing. Your two wires from the HD radio do not hook up to any of the four wires for the three button station. Take the cover off the op and find the right two screws for the radio wires, if there is no 1 2 3 screws on the outside of the op.