STIEBEL ELTRON SOM 6 SI - Manual (Page 10)

SOM 6 SI
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3.1.6 Energy Production Measurement
OHQM: Energy Production
Measurement. Adjustment
range: OFF/ON
Factory setting: OFF A measurement of the system’s energy production is pos-
sible in conjunction with a flowmeter and an additional
sensor which measures the heat exchanger’s return tem-
perature. Activate this option by changing the value of
OHQM to “on”.
Adjust this setting to the maximum flow rate of the system
in liters per minute. This is necessary in order to calculate
the system‘s actual energy output. Some controllers have
an additional parameter, FMXG, which is the flow rate in
gallons per minute.
Type of antifreeze:
0 : water
1 : propylene glycol
2 : ethylene glycol
3 : Tyfocor ® LS / G-LS
FMAX:
Volumetric flow rate in l/min
Adjustment range 0 - 20
in steps of 0.1
Factory setting 6.0
kWh/MWh:Energy produc-
tion in kWh / MWh
Display channel
MEDT: Antifreeze Type
Adjustment range 0 - 3
Factory setting 1
MED%: Antifreeze
Concentration in (Vol-) %
MED% is blinded out by
MEDT 0 and 3.
Adjustment range 20 - 70
Factory setting 45
The energy produced by the system is measured by the
calculation of the volume of heat exchanger fluid moved
through the system and a comparison of the temperature
of the fluid leaving the collector (S1) with that of the fluid
exiting the storage tank‘s heat exchanger (S4). It is shown
in kWh in one channel and MWh in another.
The total energy produced can be reset. As soon as one of
the display channels of the heat quantity is selected, the sym-
bol
is displayed solid. To reset the total energy produced
press and hold the middle key (key 3) for approximately 5
seconds. The set symbol blinks. Press key 3 again and the
total energy produced is reset to 0..
In order to interrupt the RESET-procedure, no button
should be pressed for about 5 seconds. The controller re-
turns automatically into indication mode.
3.1.7 ∆T-regulation
Please note: Switch-on temperature difference DT O must
be at least 2 °F higher than the switch-off tempe rature-
difference DT F.
DT O:
Switch-On Temperature
Differential
Adjustment range
2.0 - 40.0 °F
Factory setting 12.0
DT F:
Switch-Off Temperature
Differential
Adjustment range
1.0 - 38.0 °F
Factory setting 8.0 °F
Primarily, the controller works in the same way as a standard
differential controller. If the switch-on difference (DT O)
is reached, the pump is activated. If the adjusted switch-off
temperature is measured (DT F), the controller switches
off.