Manual De Dietrich DIETRISOL TRIO DT 350 (page 15 of 24) (English)

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16/07/2015 - 300028005-001-04 TRIO DT 250 - TRIO DT 350

 Adjustment parameter CX - Maximum collector

temperature

Adjustment range: 100 ... 125 °C

Factory setting: 100 °C



Maximum collector temperature (overheating safety): Non-

adjustable value: 130 °C.

If the temperature in the collector rises above its maximum

temperature CX even though the solar circuit is stopped (tank set

storage temperature reached), the solar pump (R1) switches on and

cools the collector (system cooling). In these conditions, the tank

temperature rises, but it can't exceed 85 °C (safety cut-off).

If the calorifier reaches the maximum temperature of 80°C (safety

shutdown), the regulator switches off the solar pump.



The collectors may reach a temperature of 160 ... 200°C, which

is normal for a solar installation.

The cooling functions allows heat to dissipate; the system thus

remains operational longer during hot summers. When it leaves the

factory, the collector's maximum temperature is preset to 100 °C;

however, it is possible to change this within the range 100 ... 125 °C.

If the maximum collector temperature is exceeded, the display shows

, and (flashing).



Adjustment parameter tu - Self-calibration phase

Adjustment range: 1 ... 5 minutes

Factory setting: 3 minutes

When the solar collector reaches a minimum temperature of 30 °C

and a preset temperature difference of 10 K from the tank

temperature, the regulator switches on the solar circulating pump at

full speed for the time period set by parameter tu. During this phase,

any air bubbles present in the solar collectors or the pipes are moved

to the complete solar station by the high circulation speed in the pipes

and eliminated by the Airstop system (manual bleed degasser).

After this phase, the regulator changes to "matched flow" mode. The

remaining self-calibration time is displayed with parameter tc.



Adjustment parameter PN - Pump minimum

speed

Adjustment range: 20 ... 100%

Factory setting: 30%

Adjustment parameter PN sets a minimum value for the solar pump

speed at the relay R1 output. The lower the pump regime, the lower

its flow.



Adjustment parameter POMP - Pump command

mode

Adjustment range: OnOF / PuLS / PSOL

Factory setting: PSOL

The POMP parameter is used to select the correct command

program for the solar pump, according to the type of pump

used.PSOL control (default setting) is designed for PWM solar-

controlled heating pumps, PuLS control for conventional frequency-

modulation heating pumps and OnOF control for "ON/OFF heating

pumps.



Adjustment parameter FT - Tubular solar collector

function

Adjustment range: 0/1

Factory setting: 0

0: no

1: yes

If the regulator detects a temperature rise in the collector of 2 K

compared to the last measurement, the solar pump runs at full speed

for 30 seconds to measure the current average temperature.

The measured temperature thus becomes the new reference

temperature.

If the measured temperature (new reference) then increases again

by 2 K, the solar pump starts again for 30 seconds.

The regulator switches automatically to solar heating mode if the

temperature difference between the collector and the calorifer

exceeds the switching-on temperature difference when the solar

pump is operating or the system is stopped.

If the collector temperature falls by 2 K while the system is stopped,

the tubular solar collector activation temperature is rechecked.

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De Dietrich DIETRISOL TRIO DT 350 Manual

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