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Figure 8-10 - Water sensors curve
8 - MAINTENANCE
8.10 - Procedure for draining
the water heater
To empty the appliance proceed as follows (see gure 5-5):
1.- close the isolation valves “10” and “3”;
2.- connect a drain pipe to drain valves “4”;
3.- open the drain valves “4”;
4.- if there is a risk of freezing it is recommended to empty
all the water in the exchanger by blowing air into a tap
with a compressor (pressure less than 3 bar).
8.11 - Fan test mode procedure
Switch-on of the fan only can be generated, accessing the
parameter 2010 situated inside the “Installer menu” (see
section 7.8) and set it on FAn. To go back to normal operating
conditions, set parameter 2010 again to 0FF.
8.12 - Gas burner minimum and
maximum power test mode procedure
Appliance operation can be forced to its own minimum,
maximum power. Proceed as follows:
1.- access parameter 2010 found in the “installer menu”
(see section 7.8);
2.- set the parameter 2010 at the following value:
a) LOu to force the appliance to minimum power;
b) Ign to force the appliance to ignition power;
a) HIgH to force the appliance to maximum power;
a) rEg to force the appliance to maximum power.
4.- to end forcing, take the parameter 2010 to the 0FF
value and press the RESET key.
8.13 - Checking the ionisation current
In any operating status, also during verications of minimum
and maximum power stated in section 8.12, the ionisation
current value can be consulted on parameter 1008 present
in the “User menu” (section 7.7). This value must be between
1.5 and 3 uA (microampere) at minimum power and between
5 and 8 uA at maximum power.
8.14 - Water temperature
sensor testing procedure
The temperature sensors are positioned on the appliances
exchanger body. The electric resistance existing between
the two contacts of the sensor, must correspond with that
stated in gure 8-10.
The temperature sensors are: 1001, 1002, 1005,
1006 and 1007, the positioning of which can be
veried in gures 3-1, 3-3 and 3-4.
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