Installation / Operation Instruction Manual

10
Electrical Connections continued-
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 other black wire on the storage unit to “L1” (120V hot) (see
figure 2). These connections enable the storage unit thermostat to control the
zone valve and the boiler operating control.
If a water heater is used to heat the fluid of the storage unit, a circulating pump
is required between the storage unit and the water heater. Connect one of the
black wires on storage unit to one leg of the circulating pump. The second leg
of the circulating pump is to be connected to “L2” (120V neutral). Connect the
other black wire on the storage unit to “L1” (120V hot) (see figure 3). These
connections enable the storage unit thermostat to control the circulating pump.
Figure 1
Other installations may require slightly different wiring
arrangements. Remember, the thermostat on the storage unit only
controls one leg of the system.
RESIDEO R4222