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C
W
HECKING
ATER
Before the water heater is first started, be sure that the pump is functioning and that there is water flow over the heat exchanger. Check the
electrical power supply of the water heater. When this is connected correctly, the display will show:
Display message
Reason
Water heater is not active. To activate the water heater press [ON/OFF] button for 6
seconds.
Display message
Reason
Water heater is not active. To activate the water heater press [ON/OFF] button for 6
seconds.
Activate the water heater by pressing the ON/OFF button for at least 6 seconds. After this the following display will appear:
Display message
Reason
Water heater is active, but there is no heat demand.
When there is no water present in the water heater or the water pressure is too low, the water heater will go into lock-out and will show a
corresponding message in the display.
Display message
Reason
Water pressure is too low or too high.
By pressing the [SERVICE] button of the water heater, the water heater can be started without a demand. The water heater will start to fire
and also the pump will start to run. Firing of the water heater without water flow (but filled with water!) will cause the so called "boiling noises".
During this "service function" you should also check the flow and return temperatures of the water heater by pressing the [◄] button once.
The temperature difference of the flow and return must be at least 13ºC and maximum 25ºC. This temperature difference indicates that there
is enough water flow over the water heater; this water flow prevents the heat exchanger being damaged by a thermal overload.
If the temperature difference is outside the parameters shown above the commissioning must be aborted until a
satisfactory flow rate has been established or damage will occur to the heat exchanger which would be outside the
scope of the water heater warranty.
F
M
LOW
ONITORING
Another safety feature of the water heater, to make sure that there is enough water flow over the water heater, is the monitoring of the flow
and return temperatures (T1 and T2). When the temperature difference (delta T) between flow and return exceeds a certain (set) value (load
dependent), the following warning messages will be shown in the display.
Display message
Reason
Temperature difference T12-T2 has exceeded the blocking value, as set in the parameters.
Display message
Reason
The temperature difference between flow and return has exceeded the blocking value
When this temperature difference exceeds the lock-out setting, the water heater will switch off and the following lock out code will be shown
at the display.
Display message
F16
Reason
Temperature difference between flow and return exceeds limitation value,
or 'dT Direct block' has occurred three times.
F
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85
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