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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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