Installation
36 Instruction manual GWV
3is
4. If you do not need to make any more connections:
- Fit the protector plate onto the electrical connector block.
3.10.5 Connecting an external on/off switch
There is an option 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. Pass the power cable through the left-hand strain relief.
2. Connect the cables (X7 and X6) to terminals 17 and 18 according to the
table(3 .10.2 "Preparation").
3. Connect the wires up to the external switch.
4. If you do not need to make any more connections:
- Fit the protector plate onto the electrical connector block.
3.10.6 Connecting an alarm signal ('Alarm OUT')
Alarm OUT is a potential free terminal that is switched when an error is
detected. This can be used to signal errors, for example with a bulb. A 230V
circuit can be powered directly. For other voltages, a specific relay prescribed
by AO Smith is required.
1. Pass the lead through the strain relief.
2. Connect the phase cables (X2 and X3) up to terminals 12 and 13 according
to the table on page 34. If required, connect earth ( ) to terminal 11.
3. Connect the wires up to the fault sensor.
4. If you do not need to make any more connections:
- Fit the protector plate onto the electrical connector block.
3.10.7 Sensor wiring
Four connectors are fitted to the left-hand side of the appliance. These
connectors connect four components up to the electronic controller. From top to
bottom, these are:
• Flow-through switch
• Storage tank
• Cold water in
• Hot water out
The wiring to these components is assembled in the factory. Only the wire to the
storage tank still needs connecting up to the sensor.
3.11 Checking the supply pressure and burner pressure
Note
Before starting the appliance and/or checking the supply pressure and
burner pressure, you must fill (5 "Filling") the appliance.
Caution
Before starting up for the first time or after conversion, you must always
check the supply pressure and burner pressure.
Note
The easiest way to check the gas pressures is by using two pressure
gauges. This procedure assumes that these two gauges are available.