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TECHnICaL InFORMaTIOn
2.9
Parameters to be set
Parameter 7 (2AH) – set value, DHW charging –
• Operation without controller:
Set value is used as DHW set value for the automatic
function device.
• Operation with RS-OT:
Set value cannot be increased by RS-OT, but it can be
decreased.
• Operation with TTT/N or TTT-WEZ:
Set value can be increased from TTT/N or TTT-WEZ up
to the value of parameter 9 (2AJ). The DHW setpoint
temperature can also be reduced below the value set in
the parameters here.
Parameter 8 (2AI) – pump follow-on time for DHW –
Here, you can define the follow-on time for the pump after
the end of DHW demand.
The after-run time runs out before the change to heating
mode and the change to standby mode (RS-OT, TTT/N
or TTT-WEZ) or OFF mode (automatic function device).
Parameter 9 (2AJ) – anti-legionella period –
Periodic heating to the temperature set under Parameter
5 (2AF) takes place to realise anti-legionella protection.
The interval at which this takes place must be set here. At
a setting of 0, the anti-legionella function is deactivated.
Parameter 10 (2AK) – Maximum fan speed in DHW
mode –
This parameter defines the maximum speed of the fan in
DHW operation.
Parameter 18 (2BH) – Maximum heating temperature
(at minimum outside temperature) –
The value set here defines the flow temperature applied
when the outside temperature falls below the "minimum
out side temperature" specified in Parameter 19 (2BI) or
if no outside sensor is connected. If the OT bus transmits
a set value to the automatic function device, this value is
li mi ted by the value defined here.
Parameter 19 (2BI) – minimum outside temperature –
This parameter defines the minimum outside temperatu-
re, i.e. if the outside temperature falls below this value,
the flow temperature should equal the temperature defi-
ned under parameter 18 (2BH).
Parameter 20 (2BJ) – minimum heating temperature
(at maximum outside temperature) –
If the outside sensor measures the value set under pa-
rameter 21 (2BK), the parameterised minimum heating
temperature is applied. If the temperature measured by
the outside sensor is above the parameterised value, the
heat demand is reset.
Parameter 21 (2BK) – maximum outside temperature –
If the maximum outside temperature defined here is ex-
cee ded, heat demand is no longer applied. As soon as
the parameterised value is reached, the minimum heating
temperature defined under parameter 20 (2BJ) is applied.
Parameter 22 (2BL) – switching delay after tempera-
ture block during heating operation –
After shutdown of the boiler as a result of a temperature
ele vation, i.e. after a set value plus the set offset is excee-
ded, start-up of the boiler in response to a future heat
de mand is delayed for a time defined with this parameter,
in de pen dent of whether the value is within the hysteresis.
Parameter 23 (2BM) – switching delay after heat de-
mand in heating operation –
Directly following a heat demand, renewed start-up of the
boiler is delayed. This means that if the set value to the
automatic firing device is reset via the OT bus and the
boiler switched off as a result, the downtime of the boiler
when a new set value is applied is at least equal to the
time set here.
Parameter 24 (2BN) – pump follow-on time heating
operation –
The time set here defines the pump follow-on time after
the end of heating operation.
Parameter 25 (2BO) – maximum fan speed in heating
operation –
This parameter defines the maximum fan speed which
can be applied in heating operation in %.
Parameter 60 (2GE) – Waiting period after opening of
the main gas valve or activation of the boiler room fan –
If a burner request is pending, boiler start-up is delayed
by the time set here. During this waiting period, which is
re quired for opening the main gas valve or for pre-ventila-
tion via the boiler room fan, the display reads "0".
Parameter 61 (2GF) - external main gas valve
(possibly LPG valve) / boiler room fan present –
This parameter defines whether an external main gas val-
ve or a boiler room fan is connected.
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