Som 7 si – STIEBEL ELTRON SOM 7 SI User Manual

Page 20

SOM 7 SI

4.1.19 Operating Mode

• HND1 / HND2

Operating mode
OFF

relay off

(blinking) +

AUTO :

relay in automatic operation

relay on

(blinking) +

HND1/HND2:
Operating Mode
Adjustment range:
OFF, AUTO, ON
Factory setting: AUTO

The thermostat function is independent from the solar loop’s
differential switching temperatures and can be used either
to control a backup heating source such as a boiler, or to
send some of the tank’s excess thermal energy to a heating
loop or heat dump. Whis one it does is dependent upon the
settings AH O and AH F.
• If AH O < AH F

The thermostat function is used to add heat to the

tank using a back up heating source.

• If AH O > AH F

The thermostat function is used to remove the tank’s

excess thermal energy.

Symbol

will be shown on the display if the second

relay output is activated.

4.1.18 Thermostat Function (Arr = 3)

Afterheating

AH O:
Thermostat

Switch-on Tem perature
Adjustment range 30 - 205°F
Factory setting 105°F

AH F:
Thermostat

Switch-off Tem pe rature
Adjustment range 30 - 205°F
Factory setting 115°F

t1 E, t2 E, t3 E:
Thermostat switch-on time
Adjustment range:

00:00 - 23:45
Factory setting: 00:00

t1 A, t2 A, t3 A:
Thermostat switch-off time
Adjustment range:

00:00 - 23:45
Factory setting: 00:00

In order to block the thermostat function for a certain time
span, there are 3 time frames t1, t2 and t3. If, for example,
the function should be activated only between 6:00 and
9:00, t1 E should be set to 6:00 and t1 A should be set for
9:00. If all of the thermostat time functions are set to 00:00,
the themostat function will be in continuous operation.
(factory setting).

4.1.20 Language

use of surplus energy

4.1.21 Units for Temperature Display

The menu unit can be adjusted:

• °FAH
• °CEL

For control and service work the operating mode of the
controller can be manually adjusted by selecting the ad-
justment value HAND, in which the following settings are
available.

The menu language can be adjusted in this channel.

• dE : German
• En : English
• It : Italian
• Fr : French

UNIT:
Temperature Display Units
A d j u s t m e n t r a n g e :
FAH, CEL
Factory setting: FAH

LANGUAGE
Language Setting
A d j u s t m e n t r a n g e :
d E , E n , I t , F r
Factory setting: En