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7 Operation
7.10.6.1 Weather compensation calculation
The required central heating temperature is calculated ac-
cording to the outside temperature and the virtual room tem-
perature set point, which is adjusted by left dial.
Note: If the outside temperature falls, the central heating tem-
perature will be increased.
Following parameters have impact to weather compensation
calculation:
•
•
Outdoor sensor correction (Parameter P02 )
•
Building estimation (Parameter P01)
•
Heating slope (Parameter U01)
•
Virtual room temperature set point
Calculation of CH temperature set point in principal is shown
below;
b
a
a Outdoor Temperature
b ODS correction P02
c Building estimation P01
d CH water temp. calculation
e Target CH water temperature
f Heating slope U01
g Virtual room temp. setpoint
Explanations of parameters related with weather compen-
sation are given in "Service parameters" and "User settings
menu" sections.
7.10.6.2
Effect of Heating Slope to CH
Temperature
The effect of heating slope is illustrated on the graph below;
Room set point 22 (ºC)
Array of heating slopes
(30)
(24)
(20)
20
10
0
Outside temperature (ºC)
7.10.7
Scot Parameters (C) Safety combustion
technology system
The PCB of the appliance provides continuous control of com-
bustion efficiency and combustion performance by means of
SCOT system. Due to SCOT system, gas valve operation is
independent of fan, so there is no need to gas valve adjust-
ment for gas/air ratio optimization.
Ionization electrode senses a current from the flame which is
on the surface of the burner, and transmits the current to the
PCB at the level of µA.
Servicing manual
34
c
d
=
+
+
+
f
g
max. (ºC)
(16)
(12)
(10)
(8)
(6)
(5)
-10
-20
min. (ºC)
PCB evaluates the transmitted current as a "point" value. This
value is defined as the "ion" in SCOT software.
By controlling ionization continuously, SCOT system ensures
the fuel / air mixture homogenously for each gas type.
SCOT PARAMETER SETTINGS
Parame-
Description
ter No
C00
Gas type
Adjustment of gas
C01
start offset
Adjustment of startup
C02
capacity
C03
Flue duct adjustment %
Adjustment minimum
C04
capacity
C05
Gas control offset
e
Flame ionization
C06
signal
Gas valve control
C07
PWM
C08
Actual capacity value %
C09
Ionization base value pts
Minimum start ioniza-
C10
tion value
C11
Ignition time
Reducing ion base
C12
value
Reducing ion at mini-
C13
mum capacity
CE
Password entry
INFORMATION
Frequently occuring combustion and ignition
80
related errors can be resolved by optimizing the
parameters. C parameters are explained in detail
70
at following section.
60
WARNING
When the flue duct is not installed properly, SCOT
50
system breakdown errors occur often. Make sure
that flue duct is mounted properly on the boiler for
40
smooth operation.
30
-30
7.10.7.1
Detailed Explanations of C Parameters
C00: This parameter is used to switch between fuel types. If
natural gas is to be used as supply gas, parameter must be
adjusted to "0" (zero). If LPG is to be used as supply gas, pa-
rameter must be adjusted to "1" (one).
C01: If a gas valve is at the limits of production tolerances,
starting gas/air ratio will be far from average value which may
also result in ignition problems (delayed or loud ignition). If
such problems are present, C02 parameter must be optimized
first. If C02 parameter change is not helping the ignition prob-
lem, offset parameter can be the real reason. Increasing the
offset value will enrich the starting gas mixture which will help
delayed ignition problems.
Unit
none 0
%
%
%
%
pts
%
pts
s
pts
pts
none -
D2CND028A1AA + D2CND028A4AA + D2CND035A1AA +
D2CND035A4AA + D2TND028A4AA + D2TND035A4AA
Wall-mounted condensing boiler
Fac-
tory
Range
setting
0 - 1
0
-9 - 20
0
-8 - 7
0
-5 - 10
0 - dyn.
0
max.
29.3
17 - 44
-
0 - 100
-
0 - 100
-
0 - 100
-
0 - 255
-
0 - 255
-
0 - 4.5
-
-5 - 10
-
-5 - 10
0 - 999
ESIE17 - 09 / 2017.11
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