6720892984 (2019/02) US
SSB
38 | Main control
Legionella_Setpoint
the control switches ON the pumps, when the
Anti_Legionella_Sensor
temperature is above
Anti_Legionella_
Setpoint
+ 5°C the control stops the pumps.
When DHW Mode 1 is selected the burner setpoint will be at
Anti_
Legionella_Setpoint
+
DHW_Store_Supply_Extra
, for DHW
Mode 6&7 the burner setpoint will be at
Anti_Legionella_Setpoint
.
If the supply temperature drops below the burner setpoint the burner is
started as well.
The burner is PID controlled towards the burner setpoint. When the
supply temperature rises above burner se
DHW_Supp_
Hysterese_Up
the burner is switched OFF.
When the
Anti_Legionella_Sensor
is above
Anti_Legionella_
Setpoint
– 3°C for
Anti_Legionella_Burn_Time
the controller
goes into post pumping and ends the Anti-Legionella demand. When the
controller has powered up, the
Anti_Legionella_Sensor
temperature
must reach a temperature of
Anti_Legionella_Setpoint
(for
Anti_Legionella_Burn_Time
) within 2 hours, otherwise the burner is
forced into Anti-Legionella demand.
Every time an Anti-Legionella demand has ended the
Anti_
Legionella_Active_Counter
is incremented to indicate how many
Anti-Legionella actions have been performed. This counter can be found
in the screen Boiler History in the epHS diagnostic tool LabVision. Also
the Anti Legionella Wait Time is started to delay the next anti legionella
cycle.
This diagnostic tool can also override the wait time for Anti-Legionella.
When this demand is forced by LabVision, the timer will be set to 0 and
Anti-Legionella demand will start immediately. Then the demand must be
completed successfully before the wait timer is set again.
The anti-legionella demand has priority over any DHW and CH demand.
However when the anti-legionella protection is active and there is no heat
or burn demand because the
Anti_Legionella_Sensor
is already at
a high enough temperature CH/DHW demand will be accepted as normal.
Relevant variables
Specific
Parameters
Level
(Default) Value Settable
°C
°F
°C
°F
Anti_Legionella_
Setpoint
Setpoint for Anti-Legionella
demand
3: Factory 60
140
50...90 122...194
Anti_Legionella_
Burn_Time
[min]
3: Factory 30
5..120
Anti_Legionella_
Wait_Time
Wait time for Anti-Legionella
demand
120 min after cold start, 168 hr
after first successful Anti-Legionella
demand
5 .3 .14
De-Air sequence (Rev 3.0.0.0)
The De-Air sequence it is a safety function starting at every power ON
and is used to remove the air from the heat-exchanger.
The De-Air sequence does not start after a general reset (such as the
locking error reset or 24 hour reset).
The display will show “dAir” indicating that the controller is performing the
De-Air sequence to purge the heat exchanger of air, by sequencing the
circulator OFF and ON. The user can cancel the De-Air sequence when
he presses a specific key-button combination from the display.
By default “De-Air” sequence takes around 14 minutes.
• 1st cycle: the 3 ways valve moves to CH position and the general
pump is activated for 10 seconds, deactivated for 10 seconds,
activated again for 10 seconds and then deactivated again for 10
seconds (
DAir_Repeation_OnOff
, which means ON/OFF/ON/OFF
each time for 10 seconds = 40 seconds in total).
• 2nd cycle: it starts when 1st cycle is ended. The 3 ways valve is
moved to DHW position and repeats the same cycling of the pump
(
DAir_Repeation_OnOff
, which means ON/OFF/ON/OFF each
time for 10 seconds = 40 second in total).
This sequence (1st 2nd cycles) is performed
DAir_Number_
Cycles
times (if
DAir_Number_Cycles
is 10 “de-air” sequence lasts
(10 x 40) x 2 = 800 seconds).
During De-Air sequence no demand will be served.
When the water pressure is too low or pressure sensor is in error, the De-
Air sequence will be suspended until water pressure / sensor pressure
is stable again. In that case the De-Air sequence will last longer than the
estimated 14 minutes.
The following scheme below shows the behaviour of the 3 way valve
and general pump during one whole cycle of De-Air sequence with a
DAir_Repeation_OnOff
set to 2.
Содержание SSB1000 SA
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