22
En
WAW systems
WAW
FIREPLACE
CH
WAW
Warm Applicable Water accumulator (boiler)
FIREPLACE
Water jacket fireplace
CH
Central heating system
T1
Upper temperature sensor of the
WAW
accumulator (option)
T2
Lower temperature sensor of the
WAW
accumulator
T3
Temperature sensor of the fireplace water jacket
P1
Pump loading
WAW
from fireplace
P2
Pump of the primary side of heat exchanger (it operates if
P1
and
P3
are activated)
P3
Circulating pump
CH
PP
Electronically controlled choke valve of the fireplace
2.1 Choke valve operation
The choke valve regulates an air supply to the combustion chamber, which allows the temperature
of the fireplace water jacket to be kept at the preset value. The task is realized by comparing the
temperature of the water jacket
(T3)
and preset temperature (the
<20>”FIREPLACE Temp.”
para-
meter) and then by gradual opening/shutting the choke valve.
The shutdown of the regulator (caused e.g. by power decline) automatically causes thechoke
valve to be set at the rest position defined by the
<50> ChokeV State OFF parameter
(Default
setting is 0% - full shut-off).
2.2 CH pump operation
If the fireplace temperature exceeds the preset value of 45 °C (the
<31> Switch-on Temp. of
PUMPS parameter)
the
CH pump (P3)
turns on. The fireplace inputs with the water jacket op-
timally operate at water temperature in the range of 45 °C - 85 °C. Most producers don’t reco-
mmend using the water jacket fireplace below the so-called dew point. The operation in such
conditions leads to emitting a lot of condensate on the surface of the furnace. The effect originates
from too much cooling down combustion gas in the combustion chamber. As a result it has a
negative impact on the cleanness of the fireplace windowpane, efficiency and life-time of the
fireplace input.
During loading the warm applicable water accumulator
WAW
, the CH pump can operate cyclically
if the
WAW
mode is set to
PRIORITY
(Limitation of the heat amount flowing into the
CH
system).
The cyclical operation is based on turning on the pump for
45 secs
and then turning off for 4mins
(the <32> Stoptime of CH PUMP parameter).
! ANTIFREEZE Function
- The control unit protects the system from freezing, automatically turning
on the circulating pump if the measured temperature is below 4 °C.
!ANTISTOP Function
- The control unit realizes the after season rundown of the pump by swit-
ching it on for 1 min if it doesn’t operate for a week.
2.3 WAW pump operation
