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Electrical Connections continued-
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.
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