89
11.3.5 H
EATING AND HOT WATER SWITCHING TIME
This function can only be used for an “indirect” programmed boiler (parameter P4 AA = 1).
In case there is a heating demand and the unit is operating for this heating demand, also a hot water demand can
be activated. A hot water demand always has priority, this means that the unit will switch to hot water operation.
When the hot water demand remains for a longer period, there will be no heat supply for/to the central heating system
during this period. Not supplying any heat for/to the central heating system might cause undesirable temperature
fluctuations. The following parameters can be used to program the preferred settings.
P5 CL
Low Flow temperature time DHW (display B4)
The period in which the set point of the water flow temperature (to the heating coil(s) of the calorifier) will switch from
“low” to “high”.
P5 CF
Max Runtime DHW during CH demand
The programmed period for the boiler to operate for DHW demand in case of a CH demand. After this period, the
boiler will continue to operate for CH demand, even when there is still a DHW demand.
P5 CM
Max Runtime CH during DHWi demand
The programmed period for the boiler to operate for CH demand in case of a DHW demand. After this period, the
boiler will continue to operate for DHW demand, even when there is still a CH demand.
The standard factory setting for this function is that the hot water demand always has priority and that no switching
between the heat and hot water demand happens, when both are active.
11.3.6 H
EATING AND HOT WATER SWITCHING TIME AT A SUDDEN TEMPERATURE DROP
This function can be used to detect indirect water tank/calorifier heat demand in case of a sudden temperature drop
within the range between the set point and the (minimum) value at which the boiler is normally switched on. For this
parameter is chosen the value of the temperature drop detected within one second, at which an immediate indirect
hot water demand is activated.
P2KH
Gradient heat demand detect Dhw tank temperature (display BG)
See the given explanation.
The standard factory setting for this function is “OFF”.
The parameter acts in this
temperature range
BOILER OFF
SET POINT
ALLOWED TO
MODULATE
O
FF
S
E
T
P
ROP
O
RTION
A
L
B
A
ND
HY
S
T
E
R
E
S
IS
BOILER
ON
SET POINT + OFFSET
