EUROSTER UNI4
–
USER MANUAL
12
5. CONTROLLER OPERATION
CAUTION! Once the controller is switched on the Anti-Stop algorithm is activated
(pump and mixer outputs are switched on for 30 seconds). The Anti-Stop mode is
repeated every two weeks, regardless of the heating season.
5.1. Feeding temperature
The UNI4 controller uses the feeding relay 1 (boiler relay output) to control the operation of
the main heating source in order to achieve the required temperature at the S1 feeding
sensor.
There are 2 heating source operation modes available in the "Settings"
–
"Feeding no.1"
–
"Boiler relay output" menu:
◼
AUTO
–
the preset temperature is established automatically according to the demand
for heat from CH1, and CH2 zones, and DHW circuit and increased by the value of the
"Allowance” setting. Additionally,
the time of heating source operation may be selected.
◼
TEMP
–
feeding temperature is maintained at a constant level. Additionally, the time of
heating source operation may be selected.
5.2. Heating zones
Heating in the selected zone is active if:
◼
a given CH zone is active,
◼
the heating season (WINTER) is switched on,
◼
the current time is selected in the schedule of the zone,
◼
the room thermostat demands heating or operation with room thermostat is switched
off,
◼
DHW tank is heated or DHW priority is switched off,
◼
feeding temperature exceeds the required one.
CH circulation pump is switched on if heating is active and the mixer is not closed. However, if
“maintenance operation” –
“continuous operation” was activated, t
he pump operates without
interruption, and the room temperature is controlled by opening or closing the mixer, taking
into account the
“Temperature reduction”
parameter.
CAUTION!
The temperature
preset
for a given CH zone
is not displayed
if:
◼
The CH zone is switched off,
◼
The room thermostat achieved a target temperature and switched the zone off,
◼
There is an idle time set up in an operation schedule of the selected zone,
◼
DHW priority function is active.
5.3. DHW circuit
DHW tank heating is on if:
◼
DHW circuit is switched on,
◼
The current time is selected in the DHW schedule.
◼
The temperature of the tank is too low,
◼
The feeding temperature is adequate (higher than the DHW).
5.3.1. Disinfection of the DHW system
Maintaining low DHW temperature (at the level of 40
ºC) facilitates the development of
bacterial flora in the system. In order to perform disinfection, take the following steps:
◼
Switch on disinfection in the DHW menu,
◼
Ensure the feeding temperature is not lower than shown by the controller
–
heating of
the tank and circulation circuit starts,
◼
Open the taps and flush the system with hot water (take necessary precautions against
possible burning).
5.4. DHW circulation
The circulation circuit is active, when:
◼
The circulation circuit is switched on,
◼
The current time is selected in the circulation schedule
◼
The system is being disinfected.
