Installation / Operation Instruction Manual

Electrical Connections continued-

GENERAL INSTALLATIONS

If a circulator is used to control the heating fluid flow from the

water heater to the boiler, a zone relay is required between the

water heater thermostat and the boiler. Connect the white wire on

the water heater to one leg of the circulator. The second leg of the

circulator is to be connected to “L2” (120V neutral). Connect the

white wire on the water heater to one leg of the zone relay. The

second leg of the zone relay is to be connected to “L2” (120V

neutral). The contact side of the zone relay is to be connected to

the boiler operating control (see figure 5). Connect the black wire

on the water heater to “L1” (120V hot). These connections enable

water heater thermostat to control the circulator, the zone relay,

and the boiler operating control.

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.