Commissioning; Appliance Handover; Recommissioning; Shutting Down - Stiebel Eltron SB 300 E Manual De Funcionamiento E Instalacion

INSTALLATION

Commissioning

10.3.1 Installing the power cable
Caution
!
Never connect the appliance to the power supply before
the DHW tank is filled.
The power to this appliance is delivered with a power cable with
a mains plug.
Use minimum 14/2 (with ground) AWG copper wire for in-
stallation. For long wire lengths, you may need to increase
the gauge size. Always install in accordance with all national
and local electrical codes.
Unit shall be connected to a 15 A dual pole breaker.
Using the 14/2 wire (or larger if the code calls for it), connect
the 14/2 wire to the 3 wires in the junction box as shown.
Use the proper strain relief grommet where the wire enters
the junction box.
See 15.6, "Wiring diagram", pg. 16.
11. Commissioning
11.1 Commissioning
Caution
!
Never connect the appliance to the power supply before
the DHW tank is filled.
11.1.1 Filling the DHW tank
Fill the DHW tank and vent the pipework by following the proce-
dure below:
Close the drain valve.
Open all DHW tap points and the shut-off valve in the cold
water supply.
Close the DHW tap points as soon as water starts to emerge
from them.

11.1.2 Appliance handover

Explain the appliance function to users and familiarize them
with its operation.
Make users aware of potential dangers, especially the risk of
scalding.
Make users aware of critical environmental factors and re-
quirements concerning the installation location.
Inform users that water may drip from the safety valve
during the heating operation.
Hand over these operating and installation instructions to
users for safe-keeping.

11.2 Recommissioning

If the appliance is switched off due to an interruption to the power
supply, no specific measures for restarting are required once the
power supply has been restored.
10 |SB 300-400 E

12. Shutting down

Caution
!
If the appliance is disconnected from the power supply,
it is no longer protected against frost.
Only disconnect the appliance from the power sup-
ply for longer periods if you are also draining the
DHW tank.
If there is no usage of hot water for a long period of time, always
drain the DHW tank. See 14.2, "Draining the tank", pg. 11.
The appliance can only be switched off by interrupting the power
supply.
Pull the mains plug from the socket or disconnect the appli-
ance from the mains in the fuse box.

13. Electrical Troubleshooting

WARNING Risk of Electric Shock
Prior to all work on the appliance, isolate it from the
power supply.
Caution
!
If you disconnect the appliance from the power supply, it
is no longer protected against frost.
Only disconnect the appliance from the power sup-
ply for longer periods if you are also draining the
DHW tank.
For work on the electric heating element, remove the heating
element cover (See 14.1, "Removing the heating element
cover", pg. 11).
If the unit does not provide hot water, then the heating element
is likely not heating the water.
1 Check that the circuit breaker is in the on position. Reset if
necessary.
2 Inspect the connections inside the junction box. Repair if
necessary.
3 Check the voltage at the junction box connections. The volt-
age should be 240 VAC.
4 Check for proper resistance of the heating element.
Turn off circuit breaker.
Disconnect wire nuts on L1 and L2 and separate wires.
Measure the resistance between the two black wires going
into the conduit of the tank. It should measure 17.6 Ω ±10%.
If the measurement is off, there may be an internal wiring
problem or a faulty heating element. Call Stiebel Eltron for
technical support.
Note
Refit the heating element cover after completing your
work. See 14, "Maintenance and cleaning", pg. 11).
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