STIEBEL ELTRON SOM 7 PLUS, Operation And Installation

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Evacuated tube collector function
O TC:
Evacuated tube collector
function
Adjustment range: OFF / ON
Factory setting: OFF
Note:
If the drainback option
ODB is activated, TCRU
will not be available. In that case, the runtime
is determined by the parameters
tFLL and tSTB.
TCEN:
Tube collector function
ending time
Adjustment range:
00:00 ... 23:45
in steps of 00:15
Factory setting: 19:00
TCST:
Tube collector function
starting time
Adjustment range:
00:00 ... 23:45
in steps of 00:15
Factory setting: 07:00
TCRU:
Tube collector function
runtime
Adjustment range: 5 ... 500 s
in steps of 5 s
Factory setting: 30 s
TCIN:
Tube collector function
standstill interval
Adjustment range: 1 ... 60 min
in steps of 1 min
Factory setting: 30 min
This function helps overcome the disadvantages caused by the
non-ideal sensor position with some tube collectors.
This function operates within an adjusted time frame
(beginning at
TCST and ending at TCEN). It activates the
collector circuit pump for an adjustable runtime (
TCRU)
between adjustable standstill intervals (
TCIN) in order to
compensate for the delayed temperature measurement.
If the runtime TCRU is set to more than ten seconds, the pump
will be run at 100 % for the first ten seconds of the runtime.
For the remaining runtime, the pump will be run at the
adjusted minimum speed
nMN.
If the collector sensor is defective or the collector is blocked,
this function is suppressed or switched off.
In system layout 7 (Arr = 7) both collectors are operated
independently from each other by means of this function.
If the tank is being loaded by one collector, the other one is
nevertheless operated after the adjusted standstill time.
Energy metering
OHQM: Energy metering
Adjustment range: OFF / ON
Factory setting: OFF
If OHQM is activated, the heat quantity gained can be
calculated and displayed. Energy metering is possible on
Arr. 1, 3, 4, 5 and 10 if a flowmeter is used. To enable energy
metering, proceed as follows:
Î Read the flow rate (l/min) from the flowmeter at maximum
pump speed and adjust it in the
FMAX channel
Î Adjust the heat transfer fluid and the concentration of the
antifreeze in the channels
MEDT and MED%.
FMAX: Flow rate in l/min
Adjustment range: 0.5 ... 100.0
in steps of 0.5
Factory setting: 6.0
MEDT: Heat transfer fluid
Adjustment range: 0 ... 3
Factory setting: 1
MED%: Antifreeze ratio
in Vol-% (MED% is hidden
when MEDT 0 or 3 is used.)
Adjustment range: 20 ... 70
in steps of 1 %
Factory setting: 45
Heat transfer fluid:
0 : Water
1 : Propylene glycol
2 : Ethylene glycol
3 : Tyfocor
® H -30 L/LS
Note:
If the system layout 10 has been selected and
OHQM is activated, energy metering will be
interrupted when the 3-way-valve switches to
the heat dump.
WARNING! Danger of injury and system damage
through pressure surges!
If a drainback system is filled due to
the tube collector function and the
heat transfer medium enters very hot
collectors, pressure surges can occur.
Î If a pressure-less drainback system
is used, TCST and TCEN must be
adjusted such that the system
will not be filled during times of
potentially strong irradiation!