A.O. Smith Innovo IR 12-160, Installation, User And Service Manual

Page: 50 / 96

8.8.2 Mains power
Note
The water heater is supplied without a power cable and isolator.
Use a power cable with cores of at least 3 x 0,75 mm
2
and an overvoltage category III,
double–pole isolator with a contact gap of at least 3 mm. The double–pole isolator must
be incorporated in the fixed wiring in accordance with the wiring rules.
Connect the water heater to the mains power supply:
1.
Pull the power cable through the tulles.
2. Connect the mains neutral core to N, the mains live core to L and the mains earth
core to
A
.
3. Install the power cable in the pull relief under the electrical section.
4. Connect the power cable to the double pole isolator.
8.8.3 Optional electrical connections
Optionally, it is possible to:
• Connect an isolating transformer (see 8.8.3.1).
• Connect an external ON mode switch (see 3.2.1.3).
• Connect an additional error signal to the water heater.
8.8.3.1 Isolating transformer
For more information about an isolating transformer, or to order an isolating transformer,
please contact A.O. Smith.
8.8.3.2 External ON mode switch
Install an external ON mode switch:
1.
Pull the cables through the tulles.
2. Connect the cables to X3 and X4.
3. Install the cables in a pull relief under the electrical section.
4. Set the appropriate settings in the interface.
Note
Use parameter
002
or
005
to set the ON mode setpoint. The parameter to be used
depends on the value of parameter
004
, refer to the table below.
Control switch ON mode/
OFF mode
(parameter
001
)
External
ON mode
switch Setpoint EXT mode
(parameter
004
)
Result
Position 0
(OFF) - - - No functionality
(Anode protection active)
Position I
(ON) OFF mode Open - Frost protection
Closed Disabled (
dIS
) EXT mode
(set setpoint with parameter
002
)
Enabled (
ENA
) EXT mode
(set setpoint with parameter
005
)
ON mode Open - ON mode
(set setpoint with parameter
002
)
Closed Disabled (
dIS
) EXT mode
(set setpoint with parameter
002
)
Enabled (
ENA
) EXT mode
(set setpoint with parameter
005
)
n
n
50 Installation, Maintenance and Service part