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1.5.2. Description
1.6. Frost protection
1.6.1. Avaliability
1.6.3. Central heating
Domestic water
production
has
a
priority
order over
central heating. At the
moment of signaling the
Frost protection can be
also
provided
by the us
e
of
an
appropriate room thermostat. When frost
protection is controlled by room
thermostat,
please consult room thermostat manuals for more details.
1.6.2. Domestic water
If the
boiler is on for supply and heating
or both (heating and
DHW production
) are off, the
protection from freezing of
water in the central heating system switches automatically on if the water
temperature
sensor in the boiler reads the value below 8°C. In this case the temperature of water in
the boiler is maintained at
8°C, until
the conditions of possible freezing disappear.
Switching on is
signaled by the blinking display
,
as well as by the LED diode of
the heater and the boiler.
In this case, domestic water conditioning has priority.
In order for
the freezing protection system of central heating
to
operate, the room thermostat should be
in the position of freezing protection
,
too
(otherwise, the circulation pump of central heating would not
operate).
need
for
heating
up the domestic water c
ylinder
by the domestic water temperature sensor
,
the
central heating
circulation pump
is switched off and the circulation pump for domestic
hot water
is
switched on.
Heaters regulate the desired water temperature
in the
boiler that is by
25°C higher than set values of a
desired domestic water temperature (independent of the central heating curve).
The c
irculation pump for domestic water
c
ylinder
is activated
un til
the desired temperature of domestic
water is reached, upon which
,
it is switched off with the previously described and programmed time
delay.
If the central heating is off, at the moment of reaching the desired domestic water temperature, the
desired water temperature in a boiler is set to the minimum value of water temperature in the boiler (stand
by).
At repeated request for heating the domestic water c
ylinder
th e desired water temperature in the
boiler is set to 25°C higher than set values of the
desired domestic water temperature.
The domestic hot water c
irculation pump is switched on as late as the water temperature in the
boiler
reaches the same or higher temperature than the desired value of domestic water temperature.
The 5°C difference
for warm
water conditioning is programmed
.
It means that
if the desired
temperature of domestic water tank is 60°C, then central heating will be switched off and domestic
water conditioni ng switched on as late as domestic water temperature is
lower than 55°C, and heating
will be switched on and domestic water conditioning switched off when the temperature in domestic
water tank reaches 60°C and when the programmed time of supplemental
operation of domestic water
circulation pump has passed.
I
f the time for domestic
hot
water
production
is longer than 30 min, especially
if the desired temperature of
the do
mestic water
cylinder
is
not
reached
within 30 min, the process will be automatically
interrupted and
will switch
to the heating reg ime , which in this case lasts
for
at least 30 min
s
.
If the boiler is on for supply and only
domestic hot water production
is on or only heating or both,
the protection from freezing of water in
the indirect cylinder
switches on automatically when the
temperature
sensor of
indirect cylinder
rea
d
s the value below 7°C, signaling switching on by blinking
display, as
well as the LED diode of the heater and warm water conditioning, regulating the
domestic
hot water cylinder
temperature to 7°C.
