HYDRAULIC CONFIGURATION 2 (two)

Description:
Hydraulic configuration number 2 consists of the Aqua stove connected to a boiler via a three-way valve, as well as heating terminals.

To activate this configuration, it is necessary to modify specific parameters on the control unit and correctly connect probes and the three-way valve.

Control Unit Parameters

Operational notes:
P26= 2 Selects hydraulic configuration 2
P83= 31 Enables the DHW probe “S3” for stoves/boilers
Ih79= 2 °C DHW Probe Thermostat Hysteresis (the hysteresis to be subtracted from the DHW thermostat to request boiler restart if it is on standby)

Verification of Puffer probe configuration

Access the menu Information → T. Puffer and check the displayed value.

• T. Puffer = 0 °C: the Puffer probe input is not enabled. Verify that the hydraulic configuration is set to P26 = 2 (configuration with puffer).
• T. Puffer = - 10 °C: the Puffer probe input is enabled (P83 = 31), 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 = 2.

DHW Probes (S3) Connections

Stoves with rear connectors:

• TECNIKA TURBO GLASS, TECNIKA FOR HOME, TURBO TOP, TURBO GLASS, PRESTIGE, EXCLUSIVE, TECNIKA EXCLUSIVE
• Probe S3 is connected on the control unit to output IN12 (Probe: NTC-10K; Moretti Part: MFSONDC)

Stoves without rear connectors:

• ALADINO, ELEGANCE, CLESSIDRA, ERGONOMIC, COMPACT, VISION, SLOT VISION, DOLBY
• Connect directly on the control unit to PIN 56 – PIN 57 (output IN12) (Probe: NTC-10K; Moretti Part: MFSONDC)

Three-way valve connection (Electrovalve P2)

Control Unit Pin                                   Connection                          Voltage

16 (N) – 17 (Foff)                              Towards system                          230 V – 50 Hz

16 (N) – 18 (Fon)                              Towards DHW kit                             230 V – 50 Hz

Room Thermostat (R.T.) Configuration

Main parameters:

Operational notes:

• Parameter P99 defines the logic of the thermostat contact (N.O. or N.C.).

P99 = 1 (default)  Room Thermostat in standard mode (N.O., normally open)

P99= 0  Inverts R.T. contact from N.O. to N.C. (normally closed)

• Parameter A01 defines the control unit behavior regarding the R.T., with options for modulation, stand-by, or pump block.

A01=0 Not recommended: On/Off 

A01=1 (default) Operating state: Normal → Modulation

A01=2  Operating state: Normal → Stand-by

A01=3 Not recommended: Pump Block

A01=4  Operating state: Normal → Stand-by + Pump Block

Warning: use only the recommended settings; values A01 = 0 or 3 may cause malfunctions or pump blocks.

• Parameter T45 must be set to 1 to properly activate the R.T. function.

T45= 1 Enables the Room Thermostat function

Example:

Thermostat Parameters 

Operating Logic

Heating

1. Activation of pump P1
   Pump P1 activates when all of the following conditions are met:
   • Boiler temperature T_boiler​ ≥ Th20 (50 °C)
   • Boiler temperature T_boiler​ ≤ Th79 (55 °C)
   • Difference between boiler probe (S) and DHW probe (S3) [T_boiler − T_DHW​] ≥ Th57 (8 °C)
2. Additional condition
   Pump P1 also activates if:
   • T_boiler​ ≥ Th19 (53 °C)
3. Frost protection
   • Pump P1 activates if T_boiler​ ≤ Th18 (5 °C)
4. Overtemperature safety
   • Pump P1 remains active if T_boiler​ ≥ Th21 (72 °C)

Sanitary

1. Switching three-way valve (P2) towards sanitary boiler
   The three-way valve switches towards the boiler when:
   • T_boiler​ ≤ Th79 (55 °C)
   • T_boiler​ ≥ Th20 (50 °C)
2. Boiler overtemperature safety
   • The three-way valve switches towards the system if T_boiler​ ≥ Th21 (72 °C)