Installation / Operation Instruction Manual

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Figure 5 – Electrical Connection with Circulator
If a zone valve to used to control the heating fluid flow from the boiler to the water
heater, a zone step-down transformer is required between the water heater
thermostat and the zone valve. Connect the white wire on the water heater to one
leg of the transformer primary side. The second leg of the primary side is to be
connected to “L2” (120V neutral). The secondary side of the transformer is to be
connected to the zone valve coil. The contact side of the zone valve is to be
connected to the boiler operating control. Connect the black wire on the water heater
to “L1” (120V hot) (see figure 6). These connections enable the water heater
thermostat to control the zone valve and the boiler operating control.
Figure 6 – Electrical Connection with Zone Valve
Other installations may require slightly different wiring arrangements. In all cases
it is important to remember that the thermostat on the water heater only controls
one leg of the system.