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CE CES CERO SERIES|
7
EN
GL
ISH
INSTALLATION
ELECTRICAL CONNECTION
7.2 Leakage check
Once all plumbing work is done, check for leaks. If necessary, take
corrective action.
8. Electrical connection
8.1 Safety
DANGER
: Electrocution
Before proceeding with any installation, adjustment, al-
teration, or service of the water heater, all circuit break-
er switches servicing the appliance must be turned off.
Make sure that nobody can activate the breaker in the
distribution panel during your service work on the ap-
pliance.
DANGER
: Electrocution
The appliance must be properly grounded. Failure to
electrically ground the product could result in serious
personal injury or death.
8.2 Electric supply
Check the electric supply infrastructure:
For Delta configuration, a three-phase wire and a ground are sup-
plied. For a Wye configuration, a three-phase wire, a neutral, and
a ground are supplied. The configuration and voltage are declared
on the unit name plate on the enclosure front type plate.
A
C
B
f
Feed the wire through the knockout (A) using a Romex clamp
for strain relief.
f
Connect the live wires to the contactor (B).
f
Pull the ground wire into the ground terminal (C).
8.3 Terminal block torque
To tighten wire to the terminal block, use the proper torque value
according to NEC:
Wire gauge (AWg)
Torque (lb-in)
8
80
6–4
165
3
275
The water heater should be connected to a properly grounded ded-
icated branch circuit of proper voltage rating. In installations with
several CE/CES/CERO water heaters, each unit requires a separate
circuit with wire sizes according to NEC.
9. Commissioning
f
Close the front cover before the electric supply is turned on.
f
Before the heater is activated by switching the electric supply
on, run hot water via a hot water faucet for a minimum of 3
minutes to purge all air from the system.
≥ 3 min.
1
2
D
00000
53
27
7
f
Turn on the circuit breaker.
f
Turn on the heater via the on/off switch.
f
Check the water temperature after several minutes of
operation.
f
Explain the end user how the heater operates.
f
Make the end user aware that hot water can cause injures if it
is more than 125 °F (52 °C).
f
Draw special attention to the safety information.
f
Hand over the operating manual to the end user.
10. Maintenance
DANGER
: Electrocution
Before proceeding with any installation, adjustment,
alteration, or service of the appliance, all circuit break-
er switches servicing the appliance must be turned off.
Make sure that nobody can activate the breaker in the
distribution panel during your service work on the ap-
pliance.
Stiebel Eltron water heaters are designed for a very long service life.
Actual life expectancy depends on water quality and use. To ensure
consistent water flow, remove scale build up on the faucet or any
connected fixtures.
