Technical data

16
6.4.3 Air heater
Function (ECO-L):
The air heaters are supplied at maximum flow
temperature from the boiler plant storage system.
The fans are connected by switches or controllers
provided by the customer. The flow rate of the
heating water is controlled by the temperature of
the return flow and thus adjusted to the air
heater's thermal output (quantity control). This
produces optimum storage stratification with long-
lasting high temperature on the storage unit flow
pipe. The heating periods (daily and weekly pro-
grammes) can be set using the integrated timer.
Operating modes:
- Off:
The air heater is switched off
- Day/Off:
Heating operation according to clocked pro-
gramme. During the day the system is ad-
justed to the set point value for return flow, and
at night it is off.
- Day:
Adjusted to the set point value for return flow
(continuous operation).
- Manual:
Pump on; the valve is not controlled (emer-
gency operation).
(mask number) parameter (factory setting)
(01) Operating mode (Day/Off)
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
Æ selects the day, pressing the button again Æ
drops the day.
(04) Heating Period 1/Start (6:00)
Time to switch on air heater.
(05) Heating Period 1/End (22:00)
Time to switch off air heater.
(06-23) Heating Periods 2-7
These depend on the number of heating periods
(see Mask 2), consisting of heating days, start
and end.
(24) Temperature of return flow (60°C)
Desired temperature of return flow
(25) ECOcircuit (YES)
The ECO automatic savings system makes the air
heater switch on and off as required.
(26) Switch off below system temperature (NO)
Should the air heater group be switched off when
a minimum system temperature is fallen short of?
(27) Frost protection function (YES)
With the frost protection function switched on, the
room heating unit is turned on when there is a
danger of frost.
(28) Carry off excess heat (NO)
If the PYROT is at risk of overheating, there is the
option of the excess heat being carried off. The
group adjust to "Flow temperature/Maximum".