21
5.4.2 Utility water heater
Function:
-
ECO-B1
When the temperature of the utility water drops, it is
reheated by the built-in heat exchanger from the heat
accumulator (hydraulic switcher). The condition for this
is a relevant difference in temperature (choice of con-
trol according to temperature difference or fixed tem-
perature).
The heating periods (daily and weekly programmes)
can be set using the integrated timer.
-
ECO-B2
When the temperature of the utility water drops, it is
reheated by the built-in heat exchanger from the heat
accumulator (hydraulic switcher). The condition for
this is a relevant difference in temperature (choice of
control according to temperature difference or fixed
temperature).
The flow rate of the heating water is controlled by the
return temperature (quantity control). This produces
optimum storage stratification with long-lasting high
temperature on the storage unit flow pipe.
The heating periods (daily and weekly programmes)
can be set using the integrated timer.
Operating modes:
-
Off:
The utility water heating system is switched off.
-
Timer:
Utility water heating following clocked programme.
(The boiler is only warmed up during the heating pe-
riod.)
-
On:
The boiler is heated up when prompted for heat and
when there is sufficient system temperature.
-
Manual:
Pump on; the valve is not controlled (emergency opera-
tion).
(screen number) parameter (factory setting)
(01) Operating mode (timer)
Select operating mode
(02) Number of heating periods (1)
The weekly programme has to be entered in the form of
heating periods. Each weekly programme consists of the
heating day, start and end. A maximum of seven heating
periods is available.
(03) Heating Period 1/Heating days (MON to SUN)
Day or days on which the switching times apply. Select
the heating days with KEYS F1 (for Mon-day) to F7 (for
Sunday). Pressing the button once
selects the day,
pressing the button again
drops the day.
(04) Heating Period 1/Start (6:00)
Start, clearance, utility water heating.
(05) Heating Period 1/End (22:00)
End, clearance, utility water heating
(06-23) Heating Periods 2-7
These depend on the number of heating periods (see
screen 2), consisting of heating days, start and end.
(24) Temperature of utility water (60°C)
Set the desired temperature of the utility water.
Additional parameters for ECO-B2
(screen number) parameter (factory setting)
-
Temperature of return flow __°C higher than the tem-
perature of the utility water (20°C)
Desired set-point temperature of return flow: actual
boiler temperature plus the amount set here.
Summary of Contents for PYROT KPT 1250
Page 7: ......
