For The User; Instructions For Use; Lighting The Heater; Filling The Heater - A.O. Smith COF 199 Installation, User And Service Manual

3. FOR THE USER

3.1

Instructions for use

3.1.1 Lighting the heater

WARNING:
An accredited installer must install the heater and
commission it.

3.1.2 Filling the heater

1. Fit the 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 of all outlets.
3. Close all the hot-water taps. The heater is now under
pressure.

3.1.3 Commissioning

1. Check that the heater is filled with water and that the
gas supply to the heater is on;
2. Turn the temperature dial clockwise as far as it will
go;
3. Switch the supply voltage on by operating the bipolar
main switch.
4. Set the 'I/0' switch on the control box to 'I'.
5. Turn the temperature control knob to the desired
position, preferably to approx. 60°C. The ventilator
burner will now ignite.
3.2

Operation

The water temperature is controlled by the control
thermostat in the control box on the column. If the
temperature in the water heater drops below the set
value, the control will send a voltage signal to the
ventilator burner. The burner automation of the ventilator
burner will then ignite the burner and keep it burning until
the control ceases to supply voltage signals.
High water temperatures cause more calcium
precipitation in the water heater. Moreover, the stand-by
losses of the water heater are greater with higher water
temperatures.
Therefore, it is recommended to set the control
thermostat to approx. 60°C
For reasons of safety, the water heater is equipped with a
high-limit thermostat and an overheating cut-out. If the
high-limit thermostat is activated, the heater is not locked
and the control thermostat will take over the temperature
control again as soon as the high-limit thermostat is
deactivated.
If the overheating cut-out is activated, it must be reset
manually after the water has cooled down.
Upon resetting, the water heater will resume its operation
in the usual way.
22
22
3.3

Shutting down

For brief periods:
1. Turn the temperature control knob fully clockwise and
set the 'I/0' switch to '0'.
For longer periods:
1. Switch off the supply voltage
(operate bipolar main switch).
2. Close the inlet gas valve;
3. Close the water supply tap.
4. Empty the heater to prevent frost damage.
3.4

Maintenance

Maintenance should be carried out at least once a 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.