GENERAL
17
- Frost protection: The pumps are switched on on the
basis of outside temperature irrespective of demand
for heat.
If outside temperature drops below -4°C the pumps
are switched on. If outside temperature is between -5°
and 1.5°C, the pumps are switched on for 10 minutes
at intervals of 6 hours. If outside temperature is above
1.5°C the pumps are switched off.
- Chimney sweep: The burner is ignited to obtain
the conditions necessary for combustion analysis.
To obtain continuous burner functioning, maximum
operating temperature is set at the boiler’s maximum
setpoint.
All loads are switched off to start with, in order to bring
the boiler to its 64°C setpoint as quickly as possible.
When the boiler reaches 64°C, the heating circuits are
opened one by one to dissipate the heat and allow the
burner to continue functioning.
- Limit thermostat (parameter 2310): This function shuts
the burner down if boiler temperature exceeds the
maximum permitted limit, which coincides with the boi-
ler’s maximum setpoint (parameter 2212 = 80 °C).
- DHW charging priority: if an optional remote storage
cylinder is installed and domestic hot water is drawn
off while the central heating circuit is also in use, this
function directs boiler power mainly to the DHW circuit.
- Boiler switching differential: This establishes a mini-
mum run time for the burner, to stop it igniting and
shutting down repeatedly. The burner shuts down
only if boiler temperature exceeds a predetermined
threshold (parameter 2240).
- Solar collector protection:
- Collector frost protection (param. 3840)
- Collector overtemperature protection (param. 3850)
- Pump protection against vapour in heat transfer fluid
(param. 3860)
G1
H1
F1
C1
D1
E1
A1
3
B1
Boiler temperature
5
MAIN SCREEN
A1 - DHW production mode: ON or OFF.
Press the DHW button to (3) to switch DHW on or off
(as shown by the line under the symbol).
B1 - Central heating modes:
Press the central heating mode button (5) to activate the various modes as shown
by the line under the corresponding symbol.
C1 - Current time.
D1 - COMFORT heating mode.
E1 - Message area.
F1 - Daily heating program indicator.
G1 - Current boiler temperature
(If parameter 22 = “Permanently” the most recent information selected in
“Information mode” is displayed.)
H1 - Burner running.
Notes on functioning
The control panel on the
TAU UNIT OIL
r
boiler controls the following functions.
