A.O. Smith DSE-5 Service Handbook page 23

Three Phase Delta Wiring - 4 Pole Contactor
The illustrations below show how six wire heating elements (page 17) are wired to 4 pole
contactors on water heaters connected to a three phase power supply. See the "Contactors"
section of this manual - pages 34 - 38.
Connection Diagram
Heating Element Flange - End View
Two ends
of loop 1
Servicing should only be performed by a Qualified Service Agent
OPERATION & SERVICE
Three phase (3Ø)
power supply
Two ends Two ends
of loop 2 of loop 3
Wiring Diagram
21
Models configured for
three phase power (3Ø)
and equipped with 4 pole
contactors will have a
jumper wire between the
2nd and 3rd poles of
the contactor.
4 Pole
Contactor
Three loops
of one heating element