STIEBEL ELTRON SOM 9s - Manual (Page 89)

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SOM 9s
Option: Thermal disinfection (OTDIS)
OTDES / TDIS
Disinfection temperature
Adjustment range: 30...200 °F
in steps of 2 °F
Factory setting: 140 °F
OTDES / DDIS
Heating period
Adjustment range:
00:00...23:59
Factory setting: 01:00
OTDES / PDIS
Monitoring period
Adjustment range:
0 ... 30:0 ... 24 (dd:hh)
Factory setting: 01:00
Reference sensor for the thermal disinfection is S3!
It is possible to adjust this sensor in the channel
TSDIS.
This function is used for protecting the upper tank zone
against legionella by activating the backup heating. For
thermal disinfection, the temperature in the upper DHW
tank zone has to be monitored. This protection is ensured
when, during the monitoring period PDIS, the disinfection
temperature TDIS is continuously exceeded for the entire
heating period DDIS. S3 is used as the reference sensor
and displayed as TSTT.
If OTD is activated, PDIS will start as soon as the tempe-
rature at S3 falls below TDIS. The display channel CDIS
appears, counting backwards the remaining time of PDIS.
If, during the monitoring period, the temperature at S3 ex-
ceeds TDIS continuously for the duration of DDIS, thermal
disinfection is considered complete and a new monitoring
period begins.
If CDIS counts down to 00:00, relay 2 will be operated in
order to use the backup heating for thermal disinfection.
CDIS will then be replaced with a display channel DDIS
showing the adjusted heating period. DDIS will start coun-
ting down the heating period as soon as TDIS is exceeded
at S3. As long as DDIS is active, the temperature at S3 will
be displayed as TDIS instead of TSTT.
If, during DDIS, the temperature at S3 exceeds TDIS by
more than 10 °R, relay 2 is switched off until the tempera-
ture falls below TDIS + 4 °R.
If, during DDIS, the temperature at S3 falls below TDIS,
the heating period will restart. DDIS can only be completed
when TDIS is exceeded without interruption.
Due to the flexible control logic, the exact time of thermal
disinfection is not predictable. In order to set a fixed time
for the disinfection to be run, the starting delay SDIS must
be used:
When a starting time for thermal disinfection with starting
delay is adjusted in SDIS, the thermal disinfection will be de-
layed until that time, even after the CDIS has counted down
to 00:00. If CDIS ends, for example, at 12:00, and SDIS has
been set to 18:00 (6:00 p.m.), relay 2 will be operated with a
delay of 6 hours at 18:00 (6:00 p.m.) instead of 12:00.
During the waiting time, SDIS is displayed with the adjusted
starting time (flashing).
If, during the waiting time, the temperature at S3 exceeds
TDIS for the adjusted heating period DDIS, thermal
disinfection is considered complete and a new monitoring
period begins.
If the starting time is adjusted to 00:00 (factory setting), the
delay function is inactive.
Upon delivery, OTDIS is deactivated. The adjustment va-
lues PDIS, TDIS, DDIS and SDIS are displayed after the
option has been activated. After the thermal disinfection
function has been completed, the values will be “hidden”
and the monitoring period will be displayed.
OTDIS
Thermal disinfection function
Adjustment range: ON / OFF
Factory setting: OFF
OTDIS / SDIS
Starting time
Adjustment range:
00:00 ... 24:00
Factory setting: 18:00
(6:00 p.m.) full hours only
Thermal disinfection with starting delay
note:
If the thermal disinfection option OTDIS is acti-
vated, the display channels TDIS and CDIS will
be displayed. TDIS will be displayed regardless
of the temperature measured at the reference
sensor.