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7.10.10 Sweeper Mode
Sweeper mode enables burner-operation independent to CH
or DHW modes. Burner can be operated at maximum or min-
imum capacity at sweeper mode.
Boiler operates at central heating during sweeper mode (The
diverter valve will switch over to CH position).
Before activating the sweeper mode, gas analyzer device
should be mounted to read the flue gas values.
To activate the sweeper mode follow the instructions below:
Press 'Menu/Enter'
and 'Cancel/Back' but-
tons at the same time
for 5 seconds (in any
mode sweeper mode
can be activated).
To quit the sweeper mode, press 'Menu/Enter' and 'Cancel/
Back' buttons at the same time for 5 seconds.Sweeper mode
will be deactivated and boiler will turn to normal operation
mode.
D2CND028A1AA + D2CND028A4AA + D2CND035A1AA +
D2CND035A4AA + D2TND028A4AA + D2TND035A4AA
Wall-mounted condensing boiler
ESIE17 - 09 / 2017.11
'TST' caption and
capacity percentage
will appear on the
screen.
When first sweeper
mode
is
activated,
boiler will operate at
maximum capacity. To
switch between maxi-
mum and minimum ca-
pacities, press 'Mode/
Reset' button.
8
SAFETY OPERATION FUNCTIONS
8.1 Low Water Temperature (LWT) Function
Aim of this function is to fill the condensate trap in case con-
densate water is evaporated, due to no operation for long
time. If water inside the trap is evaporated, this may cause
gas leakage from the condensate trap.
When Low Water temp function is active;
1. CH set value is constant and set to 45°C.
2. Pump runs at 100% capacity.
Function is active for 10 minutes of burner operation. After
function is ended, boiler operates according to central heating
setpoint adjusted by the customer and pump modulates ac-
cording to flow-return temperature difference, as usual.
While function is active,
icon blinks independent of burner operation during LWT func-
tion.
There are two conditions for Low Water Temperature Function
(LWT) to be active;
1. After power ON; where the boiler has been disconnected
from mains (230 V) for at least 3 seconds.
2. After each 90 days.
LWT function is only activated if operation mode is "Winter"
or "CH only" and room thermostat is closed, in other words, a
central heating demand is present. This is valid for both two
conditions defined above.
INFORMATION
Sweeper Mode and DHW Mode have higher
priority than LWT function; i.e. LWT function is
interrupted in case water is being tapped, but
after tapping is finished, LWT function continues
its operation.
INFORMATION
The LWT function duration 10 minutes is the time
that burner is active. If burner stops during LWT
operation (i.e. 45°C + P18 'CH Hysteresis' is
exceeded), counter also stops and waits for next
burner operation. Counter also stops during water
tapping and sweeper mode.
8.2 Temperature Gradient Supervision
The burner will be blocked for at least 60 seconds, if the tem-
perature gradient of the flow-sensor exceeds the limit 5K/s.
Note: Temperature gradient supervision is not active while
sweeper mode is active.
8 Safety operation functions
icon blinks. Please note that Info
Servicing manual
37
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