Expert area Part 2: Overview of display values and settings
36
Installation
Designation Value range Default IV
HYSTERESIS 5 K – 20 K 5 K
HYST TIME 00 min – 30 min 00 min
LOCK TIME 00 min – 30 min 00 min
HYST BURNER 2 2 K – 20 K 2 K
BOILER SEQ 0 h – 250 h 0 h
Cooling function
HS COOL-FCT 00 – 01 00
T-HS COOL 30 °C – 120 °C 95 °C
See following pages for continuation
HYSTERESIS (dynamic switching hysteresis)
HYST TIME (Hysteresis time)
Function for optimising heat generator operation with dif-
fering heat generator loads.
The effective switching hysteresis is reduced linearly after
the burner is switched on from the set HYSTERESIS to the
minimum hysteresis (5 K) during the hysteresis time
"HYST TIME".
Low heat consumption
If the system consumes little heat, the heat generator
quickly reaches the set temperature. In this case the high-
er HYSTERESIS setting takes effect. Short run-times and
frequent burner operation are prevented.
High heat consumption
During longer periods of burner operation (high heating
load) the hysteresis is automatically reduced to 5 K. This
prevents the heat generator from heating to unnecessary
high temperatures. The energy consumption of the heating
system is optimised.
! The set value of "00“ produces a constant hysteresis
value.
Operation with two-stage heat generators or with 2
heat generators
LOCK TIME (blocking time 2. burner stage)
! 00 = 10 sec.; Please consider the internal block
times of the connected burner controllers to make
the correct settings.
HYST BURNER 2 (hysteresis 2. burner stage)
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 set-
ting is exceeded by the HYSTERESIS.
Switch on the 2nd burner stage
- after start of 1st burner stage
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