CAUTION
Drain the appliance and the installation if mains power has
been interrupted and there is a possibility of freezing.
1. Drain the appliance at the drain tap.
2. Drain the installation at the lowest point.
3. Close the main cock for the water supply to the DHW section.
4. Drain the appliance by removing the DHW couplings below the appliance.
9.3.1 Frost protection
•
To avoid freezing of the condensate drain pipe the appliance must be installed in a
frost-free area.
•
To avoid freezing of the appliance it is equipped with frost protection. If the
temperature of the heat exchanger becomes too low, the burner switches on until the
temperature of the heat exchanger is sufficient. If there is a possibility of the
installation (or part of it) freezing, an (external) frost thermostat must be installed at
the coldest point of the return pipe. This must be connected in accordance with the
wiring diagram (See chapter 13).
Note
If an (external) frost thermostat has been fittted to the installation and connected to the
appliance, this will not be active when the appliance is switched off at the operating
panel (
-
on service display).
10 SETTING AND ADJUSTMENT
The functioning of the appliance is determined primarily by the (parameter) settings in
the boiler controller. Part of this can be set directly via the operating panel; another part
can only be adjusted using the installer code.
10.1 Directly via the operating panel
The following functions can be operated directly:
10.1.1 Appliance on/off
The appliance is started using the key.
When the appliance is in operation the green LED above the key will light up. When
the appliance is off a single dash lights up on the service display (
-
) to indicate that
supply voltage is present. In this mode the pressure in the CH installation (in bar) can
also be read on the main display.
10.1.2 DHW comfort
The ‘DHW comfort function’ can be operated with the DHW comfort key and has the
following settings:
•
On: ( LED on) The appliance’s DHW comfort function is switched on continuously.
In this mode the heat exchanger will be kept on temperature to assure instant
delivery of hot water.
•
Eco: ( LED on) The appliance’s DHW comfort function is self-learning. The
appliance will adapt to the pattern of use of hot tap water. As a result, the
temperature of the heat exchanger will not be maintained during the night or in the
case of long absence.
•
Off: (Both LEDs off) The temperature of the heat exchanger is not maintained, as a
result of which the delivery of hot tap water takes a little time. If there is no need for
hot tap water or its immediate delivery, the DHW comfort function can be switched
off.
10.1.3 Resetting
When a lock-out is indicated by means of a flashing LED above the
key and a code
on the main display, the appliance can be restarted by pressing the key. Check the
nature of the fault on the basis of the fault codes in § 11.1 and resolve the cause of the
fault if possible before resetting the appliance.
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