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ADJUSTING THE TEMPERATURE OF THE HIGH TEMPERATURE HEATING SYSTEM
To avoid frequent starting and stopping, raise the minimum temperature setpoint of the boiler in the heating mode by setting
parameters 740, to not less than 45°C, using the procedure described in point B.
TEMPERATURE ADJUSTMENT ON LOW TEMPERATURE HEATING SYSTEM
For a low temperature system (such as underfloor heating), reduce the maximum CH temperature setpoint on the boiler by setting
parameter 741 (point B) to a value not greater than 45°C.
11.2.2 EXTERNAL SENSOR
To connect this accessory, see figure to side (terminals 4-5) and
the instructions supplied with the sensor.
With the External Sensor connected,
control panel move the set climate curve Kt in parallel (see
annex "SECTION" E and parameter P03 in the table in section
14). To increase room temperature press +, to decrease press -.
SETTING THE "Kt" CLIMATE CURVE
To set the required kt climate curve, proceed as follows:
• Access the menu as described in section 14.
• Select parameter P03.
• Select the climate curve from among those available, see the curve chart in annex "SECTION" E at the end of this manual
(the preset curve is 1.5).
KEY TO CURVE CHART Kt - "SECTION" E
Flow temp
11.2.3 HEATING SYSTEM PUMP
Install the system pump downline from the hydraulic separator. Choose the pump according to the required system capacity/head
characteristics (see annex "SECTION" F).
A 250Vac/250Vac relay with a minimum current rating of 16A and able to withstand a starting current of above 100A is
required to connect the external pumps.
11.2.4 EXTERNAL STORAGE BOILER
The boiler can be electrically connected to an external storage boiler. A diagram of the hydraulic connection of the external storage
boiler is shown in annex "SECTION" F. Connect the storage boiler pump to terminals 9-10 of the M3 terminal block (see annex
"SECTION" B). Install the storage boiler downline from the hydraulic separator. Use the sensor supplied as an accessory and
connect it to terminals 9-10 of terminal block M2 (see annex "SECTION" B). Make sure that the exchange capacity of the storage
boiler coil is appropriate for the power of the boiler.
A 250Vac/250Vac relay with a minimum current rating of 16A and able to withstand a starting current of above 100A is
required to connect the external pumps.
EXTERNAL SYSTEM MANAGEMENT MODULES
The boiler can independently manage up to three heating circuits by using external accessories such as room units, remote
controls and external modules (AGU 2.550, AVS 75.391 and AVS 75.370). The boiler electronics also comprises a wide range of
functions for personalising and managing various system types. To assure correct system operation, a number (from 1 to 3) must
be assigned to each accessory in order to allow the boiler board to recognise it. Consequently, carefully read the instructions
provided with the accessories. The external module AVS 75.370 can be used to control modulation of 2 pumps: a zone pump and/
or the storage boiler pump.
11.2.5 MIXED ZONES ("SECTION" F)
A mixed zone can be managed using the AVS75 external module, supplied as an accessory. This accessory can manage: a zone
pump, a mixing valve, a temperature sensor, a limit thermostat and a room thermostat. To connect the components and adjust the
system read the manual provided with the accessory.
11.2.6 BOILERS IN A CASCADE CONNECTION ("SECTION" F)
The AVS75 external unit, supplied as an accessory, is used to manage a heating system with up to 16 boilers connected in a
cascade arrangement and a possible separate storage boiler providing domestic hot water. This accessory, connected to one of
the cascade boilers, can directly control the circuit components up to a maximum of 3 independent relay outlets, 2 temperature
sensors, 1 high voltage limit thermostat connector and one 1 control input (e.g.: room thermostat). The system also requires an
OCI 345 interface on each boiler comprising in the cascade arrangement. To adjust boiler parameters see section "PARAMETER
SETTINGS". To connect the components and adjust the system read the manual provided with the accessory.
11.2.7 SOLAR PLANT ("SECTION" F)
Use the AGU 2.550 external unit, supplied as an accessory, to manage a solar plant. To connect the plant, see the instructions
supplied with the accessory.
THE HYDRAULIC DIAGRAMS OF THE CASES DESCRIBED CAN BE CONSULTED IN ANNEX "SECTION" F AT THE END OF
THIS MANUAL
7690785.01 (2-07/18)
on the boiler
Outside temp
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