I placed a jumper on them and the boiler started. It seems that the electrician hooked the thermostat to the house intercom system — all 265 units had the thermostat wired to the intercom. The clocks ...

BRING ON THE CONTROLS Let’s add our controls. All we do is add the LWCO and the pressure control to the circuit in series. The first wiring diagram (Figure 7) is of a boiler with a float-type LWCO. A ...