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De Dietrich DIETRISOL TRIO DT 250 Manual

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TRIO DT 250 - TRIO DT 350 16/07/2015 - 300028005-001-04
5 solar regulator
Always fitted to installation type 1 (Parameter ANL 1).
Z
See next page (Start-up).
5.1 General description of how the unit operates
In automatic mode, the regulator operates in accordance with the
following principles:
` The sun's irradiation heat the transfer fluid in the collector. For
the regulation process to be triggered, a minimum temperature
of 30 °C is required in the collector and there must be a
temperature difference of 10 K by comparison with the tank.
` During the self-calibration phase that follows (adjustment
parameter tu, factory setting: 3 minutes), the solar pump (relay
1) operates at full speed (100 %).
` Subsequently, the solar pump regime is calculated dynamically
depending on a difference between the reference temperature
(parameter DT, factory setting 20 K) and the calorifier
temperature.
` When the zonal reversal temperature is reached in the
collectors (adjustment parameter SZ, factory setting 55°C), the
relay R2 switches the reversal valve to the upper zone in the
calorifier. The user therefore has immediate access to domestic
hot water at the set temperature.
` When the zonal reversal temperature is reached (adjustment
parameter SZ, factory setting 55°C), the set reference
temperature difference is lowered from 20 K to 10 K.
` Depending on the heat available, the system heats up the solar
tank and cuts off when the tank storage temperature is reached
(adjustment parameter SX, factory setting: 60 °C).
` When the temperature in the collectors reaches the maximum
value (adjustment parameter CX, factory setting 100°C), the
solar pump is triggered to cool the collectors. The pump
continues to operate until the temperature in the collectors is
lower than 5 K at parameter CX and/or the maximum storage
temperature (85°C) is reached in the hot water storage tank. As
soon as the temperature in the collectors drops below the
temperature in the calorifier, the calorifier is cooled down to its
set temperature. The installation is thus protected against
overheating and repeated stoppages, allowing thus the
prolonged absence of the user even in the summer period.
` The amount of heat transferred from the collectors to the tank
is displayed as parameter AH. The value is cumulative and is
constantly updated.
` The regulator (installation 2- ANL2 with heating back-up)
includes an additional function: A temperature sensor S3 is
located on the heating return.
- If the heating return temperature is equal to or greater than the
temperature of the solar tank, heating return is direct to the boiler.
- If the temperature in the solar tank is higher than the heating
return temperature, heating return passes via the solar tank. The
energy coming from the sun's rays or from a biomass boiler is thus
exploited to heat the home.
Installation 1
Installation 2
5.2 Start-up
%
If the temperature in the solar collectors is higher
than 130°C, the control system operates in safety mode.
Wait until the evening before start-up or cool down (cover)
the solar collectors.
… 10 …


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