Protherm 24(12) KTO Operation And Installation Manual - Protection Functions
10
On/OFF regulator
The boiler maintains the selected Heating
Water temperature. Operation of the boiler
is interrupted (switched on/off) according
to the internal temperature of the room
where the room control unit is installed.
Regulator with selected output
modulation function
The room control unit regulates the out-
put of the boiler into the heating system
continuously on the basis of the internal
temperature.
Operation of boiler with equithermal
regulation
The boiler regulates the Heating Water
temperature on the basis of changes in
the outside temperature. In the case of
this type of regulation it is necessary to
use a regulator with an equithermal regu-
lation function (Protherm Thermolink B,
Thermolink P or Thermolink RC) and con-
nect an outside temperature sensor.
Caution:
By setting the maximum tempe-
rature of the heating water on the control
panel of the boiler you may infl uence the
activity of equithermal regulation. In addi-
tion, the temperature of the heating water
selected on the control panel of the boiler
is also the limit temperature. In its require-
ment, the room regulator cannot exceed
the temperature limit of the maximum
permitted temperature of the heating
water as set on the control panel of the
boiler. Appropriate setting of the heating
water temperature on the control panel
of the boiler is one of the means of pro-
tection against exceeding the maximum
permitted temperature into the heating
system (fl oor heating). Nevertheless, we
recommend installation of the heating
system with an additional safety armature,
which shall prevent undesirable increases
in temperature.
Protection functions
Setting boiler output
The factory setting of the boiler is to maxi-
mum output. In case of necessity it is
possible to adjust the output of the boiler
according to requirement (with regard to
the properties of the boiler).
Important:
Change of setting of boiler
output must be performed only by an
authorised technician.
Protection against freezing
The boiler has inbuilt antifreeze protecti-
on, which prevents the boiler (but not the
heating system and hot water distributors)
from freezing. When the temperature of the
heating water drops below 8°C, the pump
is automatically started without regard to
the requirement of the room control unit
or without regard to the setting of sum-
mer mode. If the temperature of the hea-
ting water in the boiler rises and reaches
10°C, the pump is automatically switched
off. If the temperature of the heating water
continues to drop and reaches the tempe-
rature of 5°C, the boiler is started up and
heats the heating water to 35°C.
Important:
During active function of anti-
freeze protection, the three-way valve is
switched to central position, thus activa-
ting heating of the heating water and hot
water.
Protection of hot water tank against
freezing (for types KTO and KOO
with connected external hot water
tank)
When the hot water in the tank drops
below 10°C, the boiler is automatically
started and heats the tank to 15°C. This
function is active only in the case of con-
nection of an external tank equipped with
an NTC sensor.