10
Operation of boiler with equithermal
control
The boiler regulates the heating water
temperature on the basis of outdoor
temperature changes. In the case of this
type of regulation it is necessary to set
the equithermal curve according to the
required heating water temperature. It
is also necessary to attach an outdoor
temperature sensor. The procedure for
setting equithermal curves is outlined on
page 6 of this manual.
Important:
The room control unit and
outdoor temperature sensor must be
connected only by an authorised service.
Note:
During all types of boiler regulation,
heating of the hot water in the tank always
has priority, i.e. when a command for
heating the hot water is sent from the
tank, the boiler automatically switches
to the mode of heating the hot water in
the tank. After heating the hot water to
the required temperature the boiler is
automatically switched to the regime of
heating the heating water into the system
and continues in the heating system.
Setting boiler output
The factory setting of the boiler is to
maximum 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). In the case of
heating the hot water in the tank up to the
required temperature the boiler always
works at full output.
Important:
Change of setting of boiler
output must be performed only by an
authorised technician.
Protection functions
Continuous output modulation
This takes place on the basis of constant
comparison of the actually attained
values with the values requested (set) by
the user; this regulation is proportional,
i.e. in the case of a larger difference of
compared values the boiler works with a
higher output and vice versa.
Protection against freezing
When the temperature of the heating water
drops below 8°C, the boiler is automatically
started and heats the heating water.
Protection of hot water tank against
freezing
When the hot water in the tank drops
below 8°C, the boiler is automatically
started and heats the tank. This function
is active only in the case that heating of
the hot water in the tank is switched off.
Pump protection
There is a possibility of blockage of the
pump due to sedimentation of sludge in
its bearings when the pump is idle for a
longer period of time. Switch the pump on
for a short time when it has been in the
room continuously for 24 hours.
Running down of pump
After the boiler is switched off by the room
control unit the pump continues to ensure
circulation of water in the heating system
for approximately 1 minute (only in heating
mode).
Anti-cycling
After the boiler has been shut down in
heating mode it cannot be restarted
sooner than 1 minute after shutdown
and the temperature of the heating water
drops by 8°C.
Note:
This does not apply when the boiler
has been switched off by the room control
unit.
Protection against overheating
The pump is switched on always when
the temperature of the heating water is
higher than was set by the user, or if the
temperature of the heating water is higher
