STIEBEL ELTRON SOM 9s - Manual (Page 85)

© Stiebel 11091_SOM_9s.mon
us.ind
d
85 |
SOM 9s
LLOGI/DTOVR
Adjustment range: 0.0 ... 40.0 °R
Factory setting: 10 °R
note:
The overrun function is only available, if both
Grundfos sensors (VFS and RPS) are used.
The system cooling function aims to keep the solar system
operational for a longer time. The function overrides the
maximum tank temperature to provide thermal relief of
the collector field and the heat transfer fluid on hot days.
If the tank temperature is higher than the adjusted maximum
tank temperature and the switch-on temperature difference
DTCO is reached, the solar system remains activated or
is switched on. Solar loading is continued until either the
temperature difference falls below the adjusted value DTCF
or the collector emergency shutdown temperature CeM
is reached.
If the system cooling function is active, is shown on the
display (flashing).
System cooling
CooL / OSYC
System cooling option
Adjustment range: ON / OFF
Factory setting: OFF
COOL / DTCO
Switch-on temperature diff.
Adjustment range: 2.0 ... 60.0 °R
Factory setting: 40.0 °R
COOl / DTCF
Switch-off temperature diff.
Adjustment range: 1.0 ... 59.0 °R
Factory setting: 30.0 °R
note:
This function will only be available if the collec-
tor cooling function, the heat dump function, and
the drainback option are deactivated.
Tank cooling
When the tank cooling function is activated, the controller
aims to cool down the tank during the night in order to
prepare it for solar loading on the following day.
If the adjusted maximum tank temperature (S MAX /
S1MAX / S2MAX) is exceeded and the collector tempe-
rature falls below the tank temperature, the system will be
reactivated in order to cool down the tank.
Reference temperature differences are DT O and DT F.
COOl / OSTC
Option tank cooling
Adjustment range: ON / OFF
Factory setting: OFF
note:
If the temperature at the tank sensor reaches
200 °F, all cooling functions will be blocked. The
switch-on hysteresis is 10 °R.
Cooling functions Different cooling functions can be activated: system cooling,
tank cooling and heat dump.
COOl / OTCL
Overtemperature collector
Adjustment range: 150 ... 320 °F
Factory setting: 230 °F
Heat dump
COOL / OHDP
Heat dump function
Selection: ON / OFF
Factory setting: OFF
If the heat dump function OHDP is activated, the selected
relay is energized with 100%, if the collector temperature
reaches the adjusted collector overtemperature OTCL.
If the collector temperature falls by 10 °R below the adju-
sted collector overtemperature OTCL, the relay will be
switched off.
A selection can be made between pump logic and valve logic
(OTPUM On = pump logic, OTPUM OFF = valve logic).
If pump logic is selected, the relay for solar loading switches
off and the relay for heat dump remains switched on.
The relay for the heat dump function can be selected in the
HDReL channel.
note:
The adjustable value OTCL is locked against
the collector emergency temperature CeM
by 20 °R. The heat dump will only be available
if the collector cooling function, the system
cooling function, and the drainback option are
deactivated.
COOL / OTPUM
Pump or valve logic
Selection: ON / OFF
Factory setting: OFF
COOL / HDREL
Relay heat dump function
Selection: system dependent
Factory setting: 3