Som 7 si – STIEBEL ELTRON SOM 7 SI User Manual

Page 16

SOM 7 SI

4.1.6 Operating hours counter

The operating hours counter adds up the solar operating

hours of the respective relay (h P / h P1 / hP2). The total

amount of hours which the relay has been active is shown

on the display.
The operating hours total can be reset. As soon as the oper-
ating hours channel is selected, the symbol

is displayed

solid. To reset the operating hours press and hold the middle

key (key 3) for approximately 5 seconds. The set symbol

blinks. Press key 3 again and the operating hours counter

is reset to 0.
In order to interrupt the RESET-procedure, don’t press

any button for about 5 seconds. The controller returns

automatically into the display mode.

h P / h P1 / h P2:
Operating Hours Counter
Indication channel

4.1.7 Energy Production Measurement

OHQM: Energy Production
Measurement. Adjustment
range: OFF/ON
Factory setting: OFF
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: Type of antifreeze
Adjustment range 0 - 3
Factory setting 1

MED%: Concentration of
antifreeze 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.

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