DE DIETRICH DIETRISOL TRIO DT 250 - TRIO DT 350 - Manual (Page 14)

14
TRIO DT 250 - TRIO DT 350 17/10/12 - 300028005-001-03
„ Adjustment parameter DT - Reference
temperature difference
Adjustment range: 10 ... 20 K
Factory setting: 20 K

Switching-on difference: Non-adjustable value 10 K
Switching-off difference: Non-adjustable value 5 K
The regulator reads the temperatures measured by sensors S1 (TC)
and S2 (TS) and compares the resulting temperature difference with
the switching-on difference which is preset to 10 K. Regulation is
activated when the temperature difference
∆T is equal to or greater
than the preset value. The display shows . The LED changes to
green. When the value falls below the preset 5 K switching-off
difference, the regulator switches off. The regulator tries to achieve a
temperature difference of 20 K (factory setting) between the collector
and the tank to produce high temperature hot water as rapidly as
possible. To do this, it uses dynamic speed control.
„
Adjustment parameter SZ - Zone changeover
temperature
Adjustment range: 20 ... 80 °C
Factory setting: 55 °C
If the temperature in the collectors reaches value SZ, the relay R3
closes.
If the temperature in the collectors is lower than value SZ, the arrow
" flashes.
If the temperature in the collectors is higher than value SZ, the arrow
# flashes.

We advise you to set the domestic hot water booster
temperature to 50°C. If the customer wants a higher
temperature, parameter SZ will have to be changed. SZ is
set to 55°C in the factory and must always be 5K higher
than the DHW booster circuit temperature setting(s).
If the domestic hot water boiler circuit is set at more than
50°C, SZ must be adjusted to 5K above this DHW circuit
temperature setting.
If the booster is electric, the resistance thermostat must be
set at 50°C.
„ Adjustment parameter SX - Set temperature of the
solar calorifier
Adjustment range: 20 ... 80 °C
Factory setting: 60 °C
 Maximum tank temperature (emergency cut-off): Non-
adjustable value 80 °C
The set temperature Sx is the desired temperature for the solar
calorifier.
If the maximum tank temperature is exceeded, tank heating is
interrupted to prevent damage due to overheating. The display
shows
and (flashing) and the LED changes to flashing red/
green.
The higher the set temperature for the calorifier, the greater the
energy stored. Setting to 60 ... 75°C is suitable for normal use with
daily draw-offs.
In the event of prolonged absences (weekend, holidays):
- Reduce the calorifier temperature to 50°C
- Turn off the back-up (boiler or electrical resistance)
The installation is thus protected against overheating and the
longevity of the heat conducting fluid is conserved.