18
3
FOR THE USER
3.1
INSTRUCTIONS FOR USE
3.1.1 Warning:
An accredited installer must install and commission the
heater for the first time
3.1.2 Filling the heater
1. Fit drain cock and check that it is closed
2. Open the cold-water tap to the heater and all hot-
water outlets in order to remove all air from the
system. The heater has been filled when cold water
runs out at all outlets.
3. Close all the hot-water taps. The heater is now under
mains pressure. The relief valve may not release any
water at this pressure, which can be read on the
manometer.
3.2
COMMISSIONING
ADMP MODELS:
1. Switch the electricity supply to the control box off by
switching off the main switch.
2. Check that the heater is filled with water and that the
gas supply heater is on.
3. Tum the temperature dial anti-clockwise as far as it
can go.
4. Press the white control button on the gas control
block and keep it pressed in while pressing the
piezo ignition a number of times until the pilot light is
lit. The pilot light can be seen through the inspection
window above the burner assembly.
5. Press the white control button for about 30 seconds.
When it is released the pilot light must remain lit. If it
does not wait 5 minutes before repeating the ignition
procedure.
6. Switch on the electricity supply by switching on the
main switch.
7. Set the 1/O button to I. The control light on the switch
will light up.
8. Turn the temperature control dial to the desired
position, position 3 (approx. 60ºC) is recommended.
The burner ignites; the heater will now operate
automatically.
3.2
OPERATION
The temperature is regulated by the control box. The
control thermostat in the control box automatically
switches the gas supply to the burner via the gas control
box. This means that the gas supply to the burner is
opened when the water temperature reduces and that it
is closed when the set temperature is reached. The
temperature is indicated by the position of the
temperature dial:
Position 1 = approx. 40ºC
Position 2 = approx. 50ºC
Position 3 = approx. 60ºC
Position 4 = approx. 70ºC
Calcium deposition increases at high temperatures. In
addition, standby losses are greater when the
temperature is high. Therefore, we recommend that the
control thermostat is set at 60ºC. For safety reasons, the
heater is equipped with a high-limit and overheat
thermostat. The pilot light continues to burn when the
high-limit thermostat is activated. The pilot light is
extinguished when the overheat thermostat is activated.
The pilot light must be relit before the heater can be
operational once again.
3.3.
SHUTTING DOWN
ADMP models:
For brief periods:
1. Turn the temperature control dial anti-clockwise as
far as it will go and set the I/O switch on O. The pilot
light will continue to burn.
For longer periods:
1. Press the red button on the gas control block (pilot
light goes out)
2. Close the gas tap in the feeder piping
3. Close the water inlet tap
4. Switch off the electricity supply
5. Empty the heater in case of imminent frost
3.4
MAINTENANCE
Maintenance should be carried out at least once per
year in accordance with the recommendations of
A.O.Smith. Failure to carry out adequate maintenance
may render the warranty void. We recommend that you
take out a maintenance contract with your installer.