STIEBEL ELTRON SOM 8 PLUS - Page 52

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Heat exchange The heat exchange function can be used for transfer-
ring heat from a heat source to a heat sink.
The allocated relay is energised when all switch-on
conditions are fullled:
• the temperature dierence between the allocated
sensors has exceeded the switch-on temperature
dierence
• the temperature at the heat source sensor has
exceeded the minimum temperature
• the temperature at the heat sink sensor has fallen
below the maximum temperature
If ∆Tset is exceeded, pump speed control will come
into eect. For every deviation of 2 K [4 °Ra], the
pump speed will be adjusted by 10 %.
Sensor Source
Relay
Sensor Sink
Adjustment channel Description Adjustment range / selection Factory setting
Relay Relay selection system dependent system dependent
Sen. So. Heat source sensor selection system dependent system dependent
Sen. Sink Heat sink sensor selection system dependent system dependent
∆Ton Switch-on temperature dierence 1.0 ... 30.0 K [2.0 ... 60.0 °Ra] 6.0 K [12.0°Ra]
∆To Switch-o temperature dierence 0.5 ... 29.5 K [1.0 ... 59.0 °Ra] 4.0 K [8.0°Ra]
∆Tset Set temperature dierence 1.5 ... 40.0 K [3.0 ... 80.0 °Ra] 10.0 K [20.0°Ra]
Min. speed Minimum speed 30 ... 100 % 30 %
Tmax
Maximum temperature of the
store to be loaded
10 ... 95 °C [50 ... 204 °F] 60 °C [140 °F]
Tmin
Minimum temperature of the
store to be loaded
10 ... 95 °C [50 ... 204 °F] 10 °C [50 °F]
Funct. Activation / Deactivation Activ., Deactivated Deactivated
Arrangement / Opt. functions / Add new function... / Heat exchange
295931-36390-8667 SOM 8 plus_en.indb 52 20.10.2011 13:14:46