Expert area
Part 2: Overview of display values and settings
22
Switching pattern for 2-stage burners
5K
a
c
c
A
B
C
D
E
F
d
e
e
d
b
57°C
55°C
50°C
45°C
A Boiler temperature
B Time
C Boiler temperature setting
D Lock-Time (blocking time 2. burner stage)
E Hysteresis (dynamic switching hysteresis)
F Hyst Burner 2 (Hysteresis for shutdown)
a
Module 1 on
b
Start of blocking time 2. Burner stage
c
Module 2 on (module 2 enable)
d
Module 2 off
e
Module 1 off (cancel module 2 enable)
Switching behaviour of the HS with gradient
method
Parameter Gradient = On => Premature deactivation (or
deactivation in due time) of a heat generator (burnt out in
the case of pellet)
A
Min T-HS = Minimum heat
generator temperature => Switch
off point to minimum temperature
or calculated desired temperature
(here according to heat slope 1,3)
B
[(Max T-HS) – (Max reduce)] =
Earliest switch off point using
gradient procedure; takes effect
when heat consumption is low
(rapid heat generator temperature
increase)
C
Max T-HS = Latest switch off
point using gradient procedure;
takes effect when heat
consumption is high (slow HS
temperature increase)
D
T-HS Cool = When the HS
reaches this temperature, the
emergency cooling function via
the consumer circuits is activated.
!
This switching patterns is also effective for
operating two switching heat generators via the
burner relays A6 and A7.
Switch on the 1st Burner stage when temperature drops
below set temperature of the heat generator.
Switch off the 1st Burner stage when the temperature
setting is exceeded by the hysteresis.
Switch on the 2nd Burner stage
- after start of 1st Burner stage
- and temperature drops below set temperature by 5K
(= Start of the Lock-Time)
- and expiry of the Lock-Time
(= Release 2nd burner stage)
Switch off 2nd Burner stage when the temperature setting
is exceeded by the hysteresis.
Switch 2nd Burner stage when temperature drops below
set temperature of the heat generator.
Switch off the 1st Burner stage when 2nd stage enabled
after temperature setting exceeded by the value
[Hyst Hyst Burner 2]
Heat generator temperature [°C]
Outside temperature [°C]
Heat slope diagram (setting aid)
100
20
16
12
8
4
0
-4
-8
-12
-16
0.2
0.4
0.6
0.8
1.0
1.3
1.5
2.0
2.5
3.0
120
80
60
40
20
A
B
C
D