If the cell info says 208 - 277 Volts it needs that between phase and neutral.
Otherwise the bimetallic strip will not heat up enough, or the internal electronics doesn't work at the undervoltage of 120 Volts.
Normally at switch on (daytime) the load should come on for about a minute and then switch off, to show that the circuit works.
If the lights stay on, either the control voltage is not correct 120V instead of 208 - 277V or the contacts have fused together because of overload.
