Apex9

Been a long time since I installed a Balboa gas board but, from what I thought I remembered, they did not send 240 volts to the 2 heater fingers and rather it operated as an open and closed switch. I have this board (brand new never installed) on the test bench and it sends 240 volts to heater terminals when calling for heat? I also thought these boards only utilized the temperature sensor and used the flow switch and high limit in the gas heater safety circuit. Although it appears that is the case with the flow switch, when I tried running it without the high limit, it gave a SN1 error? Does anybody remember how these boards work, have a list how the jumpers are set and or a tech sheet? I tried changing most of the jumpers in different positions to no avail? Thanks, Jeff