A.O. Smith SGS - 100 Installation & Service Manual page 40

3
3.12.7
3.12.8
3.12.9
40
Installation
Connecting communication cable
Note
>The communication cable must always be connected, otherwise neither
the appliance nor the solar heating system controller will run.
1. Connect the double connector to J16.
2. Fit the cable in the strain relief.
3. Connect the other end of the communication cable to the terminal block of
the appliance. See:
- connecting communication cable to appliance
communication cable to solar heating system")
- electrical diagrams
4. Connect the optional head pump
QT sensor (3.12.9 "Connecting Q/T
5. If you have no more connections to make:
- Fit the cap on the electrical terminal block.
- Fit the plastic covers onto the appliance.
Connecting extra head pump
Note
This pump is essential if a greater head is required. When the system has
such a high resistance (>110 kPa) that the pump in the pump station is
insufficient, you can connect a second (ON/OFF) pump to the solar heating
system controller.
1. Connect earth ( ), live and neutral to terminals 7 through 9.
2. Fit the cable in the strain relief.
3. If you need to connect an extra head pump continue
Q/T sensor"), otherwise:
- Fit the cap on the terminal block.
- Fit the covers onto the appliance.
Connecting Q/T sensor
Note
You can optionally add a Q/T sensor to the installation. This enables you to
calculate the energy contribution of the system. For more information or to order
the Q/T sensor, please contact your supplier.
1. Connect the 5V to J12-1.
2. Connect sensor S to J12-2.
4
3. Connect earth to J12-3.
4. Connect the "flow signal" to J12-4.
5. Fit the cable in the strain relief.
6. If you have no more connections to make:
- Fit the cap on the electrical terminal block.
- Fit the plastic covers onto the appliance.
(17.3 "Electrical diagram for the
(3.12.8 "Connecting extra head pump")
sensor").
Instruction manual SGS
is
(3.11.8 "Connecting
appliance").
or
(3.12.9 "Connecting