HYDRAULIC CONFIGURATION 4 (four) - SCHEME 1

Configuration Description

The Hydraulic Configuration 4 involves connecting the Aqua stove/boiler to a technical water thermal storage system (buffer) equipped with a temperature probe S1.

Activating the configuration requires:

• correct parameter settings on the electronic control unit;
• electrical connection of the NTC-10K probe to the dedicated input (IN10).

SCHEME 1 – Thermal storage system (buffer) with a single temperature probe (S1)

The system regulation occurs through direct reading of the buffer temperature via an NTC 10K probe connected to the control unit.
 

Control Unit Parameters

A temperature differential is provided (default 5 °C); for control unit PSYSL01000263 (MB250), the parameter to check as Boiler Probe - Buffer Probe Differential is T37=5°C

Operational Notes: 

P26=4 Selects hydraulic configuration 4
P73=9   Enables buffer temperature probe S1 for stoves/boilers
Ih58= 2 °C   default  - Buffer thermostat hysteresis (Value subtracted from the buffer setpoint to determine the generator reactivation threshold in standby condition).
D23= 4 °C   default  - Delta to add to the boiler setpoint for switching from modulation to standby at the end of time T43 (10 s default)
Th81= 5 °C   default  -  Boiler Probe - Buffer Probe Differential

Technical Note

It is recommended to set the boiler/stove setpoint to a temperature higher than the buffer setpoint to ensure proper energy transfer.

Verification of the Buffer Probe Configuration

Access the menu Information → Buffer Temp. and check the displayed value.

• Buffer Temp. = 0 °C: the buffer probe input is not enabled. Verify that the hydraulic configuration is set to P26 = 4 (configuration with buffer).
• Buffer Temp. = -10 °C: the buffer probe input is enabled (P73 = 9), but no probe is detected. Verify that an NTC 10k probe is installed, correctly connected to input S1, and that the hydraulic configuration is set to P26 = 4.

Buffer Temperature Probe Connection (S1)

Stoves with rear connectors:

• TECNIKA TURBO GLASS, TECNIKA FOR HOME, TURBO TOP, TURBO GLASS, PRESTIGE, EXCLUSIVE, TECNIKA EXCLUSIVE
• Probe S1 is connected on the control unit to output IN10 (Probe: NTC-10K; Moretti Item: MFSONDC)

Stoves without rear connectors:

• ALADINO, ELEGANCE, CLESSIDRA, ERGONOMIC, COMPACT, VISION, SLOT VISION, DOLBY
• Connect the S1 probe cables directly to the control unit at PIN 52 – PIN 53 GND (output IN10) (Probe: NTC-10K; Moretti Item: MFSONDC)

Verification of Buffer Temperature Probe Connection

To verify the correct connection and reading of the Buffer Temperature Probe, proceed as follows:

1. Access the remote control.
2. Enter the User Menu.
3. Select the “Information” item.

Within this screen, the temperature detected by probe S1 is displayed once activated (P73=9).

To change the buffer setpoint, proceed as follows:

1. Access the remote control.
2. Enter the User Menu.
3. Select the “Thermostats” item.
4. Select the “Buffer” item.

In this section, it is possible to set the buffer temperature setpoint.

Technical Verification:

• If the temperature is displayed correctly and matches the actual buffer temperature, the connection is correct.
• If the value is missing, fixed, or inconsistent, verify:
  • correct wiring on the control unit;
  • integrity of the probe (NTC 10K);
  • correct enabling of parameters in the control unit (P26 and P73).

Operating Logic:

Example_1:
 

· STAND-BY upon reaching the buffer setpoint
The boiler/stove enters standby mode when the buffer reaches the set temperature.

· Circulator (pump P1) shutdown 
The circulator (pump P1) is deactivated only when the difference between the boiler temperature and the buffer temperature falls below the value set by parameter Th81 (default: 5 °C).

Operating example:

Temperature difference:
Boiler temperature (probe reading) − Buffer temperature (probe reading) = ΔT

Boiler temperature (probe reading) = 70 °C
Buffer temperature (probe reading) = 63 °C

ΔT= 7 °C → Pump P1 is operating 
When ΔT reaches 5 °C  (equal to Th81), water circulation stops.

· WARNING: The boiler enters standby mode when the set temperature (boiler setpoint) plus the differential D23 (default: +4 °C) is reached. 
A boiler temperature set too low may prevent the buffer from reaching its setpoint. This can cause continuous on/off cycles, resulting in suboptimal product performance.