A.O. Smith BFC Cyclone, Installation, User And Service Manual

Page: 66 / 118

7.7.2 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 1,0 mm
2
and a double-pole isolator with a
contact gap of at least 3 mm.
Connect the water heater to the mains power supply:
Connect neutral (N), live (L) and earth (
A
) of the power cable to terminals 1 thru 3 of
the terminal block as shown in the table (see section 7.7.1).
Fit the power cable in the strain relief.
Connect the power cable to the isolator.
If you have no more connections to make:
Fit the cover on the terminal block.
Fit the covers onto the water heater.
7.7.3 Optional electrical connections
Optionally, it is possible to:
Connect an isolating transformer (see section 7.7.3.1).
Connect a program-controlled pump (see section 7.7.3.2).
Connect an external ON mode switch (see section 7.7.3.3).
Connect an additional error signal (see section 7.7.3.4) to the water heater.
7.7.3.1 Isolating transformer
For more information about an isolating transformer, or to order an isolating transformer,
please contact A.O. Smith.
An isolating transformer should be used if there is a case of 'floating neutral'.
Note
The total power consumed by the appliance goes via the isolating transformer.
Refer to the fitting instructions provided with the isolating transformer. (Contact the
supplier for details of the correct isolating transformer.)
Connect the neutral (N), live (L) and earth (
A
) of the power cables to terminals 4
through 9 of the connection block according to the table (see section 7.7.1).
Fit the cables in the strain relief.
If you have no more connections to make:
Fit the cover on the terminal block.
Fit the covers onto the water heater.
Connect the power cable to the isolator.
7.7.3.2 Program-controlled pump
Note
The maximum power capacity for a pump regulated by the controller is 100W.
Connect neutral (N), live (L) and earth (
A
) to terminals 13, 14 and 15 as indicated in
the table (see section 7.7.1).
Fit the cable in the strain relief.
If you have no more connections to make:
Fit the cover on the terminal block.
Fit the covers onto the water heater.
7.7.3.3 External ON mode switch
External ON/OFF is an option for connecting an external ON/OFF switch. In the OFF
position, the programmed operating mode is active. In the ON position, the programmed
operating mode is overruled, and "ON mode" is active.
Connect leads (X3 and X4) to terminals 21 and 22 according to the table (see section
7.7.1).
n
1.
2.
3.
4.
-
-
•
•
•
•
n
1.
2.
3.
4.
-
-
5.
n
1.
2.
3.
-
-
1.
66 Installation, Maintenance and Service part