Isolating Transformer - A.O. Smith SGS - 100 Installation & Service Manual

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3.11.3
3.11.4
3.11.5
3.11.6
Instruction manual SGS
Connecting the mains voltage
The appliance is supplied without a power cable and isolator.
Note
In order to receive electrical power, the appliance has to be connected to the
mains power by means of a permanent electrical connection. A double-pole
isolator with a contact gap of at least 3 mm must be fitted between this
permanent connection and the appliance. The power cable must have cores of
2
at least 3 x 1.0 mm .
Warning
Leave the appliance isolated until you are ready to start it up.
1. Connect phase (L), neutral (N) and earth ( ) of the power cable to terminals
22 through 24 of the connection block as indicated in the
table (3.11.2 "Preparation").
2. Fit the power cable in the strain relief.
3. Connect the power cable to the isolator.
4. If you have no more connections to make:
- Fit the cap on the electrical terminal block.
- Fit the plastic covers onto the appliance.

Isolating transformer

An isolating transformer should be used if there is a case of 'floating neutral'.
1. Refer to fitting instructions provided with the isolating transformer. (Contact
the supplier for details of the correct isolating transformer.)
2. Connect phase (L), neutral (N) and earth ( ) to terminals 16 through 21 of
the terminal block as stated in the table
3. Fit the cables in the strain relief.
4. If you have no more connections to make:
- Fit the cap on the electrical terminal block.
- Fit the plastic covers onto the appliance.
5. Connect the power cable to the isolator.
Connecting a program-controlled pump
1. Connect live (L), neutral (N) and earth ( ) to terminals 10, 11 and 12 as
indicated in the table (3.11.2
diagram.
2. Fit the cable in the strain relief.
3. If you have no more connections to make:
- Fit the cap on the electrical terminal block.
- Fit the plastic covers onto the appliance.
Connecting an extra ON mode switch ("Tank ON")
Tank ON is a facility for connecting an external ON/OFF switch. In the OFF
position, the programmed operating state is active. In the ON position, the
programmed operating mode is overruled, and the "ON mode" is active.
1. Connect cables (X and X
1
table (3.11.2 "Preparation").
2. Fit the cable in the strain relief.
3. If you have no more connections to make:
- Fit the cap on the electrical terminal block.
- Fit the plastic covers onto the appliance.
(3.11.2 "Preparation").
"Preparation"). This is for pump 8 in the
) to terminals 5 and 6 as indicated in the
2
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