MCZ Duo HYDRO AIR - Manual (Page 21)

21
12-SETTINGS MENU
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• External probe
It makes it possible to work with system temperature adjustment. If installing an external probe on terminals 1 and 2 (NTC 10KOhm at
25°C b=3435) water temperature is automatically calculated by the electronics based on the external temperature according to the curves
shown below.
The external probe must be installed on an external wall exposed towards North or North-West. If necessary, it is possible to correct the
value read by the probe of + 5 -5°C.
• Boiler probe
To activate this option, connect a probe (NTC 10KOhm at 25°C b=3435) to points 1 and 2 of the back 9 pole terminal board.
The heat request occurs when the boiler probe reads a temperature that is 2°C below the one set by the accumulation temperature marked
by a tap in the temperature menu.
In this configuration the aux output is configured as a potential free contact to control the 3-way valve (contact 7-8-9 of the back 9 pole
terminal board)
• Boiler thermostat
To activate this option, connect a Normally Open (N.O.) contact thermostat to points 1 and 2 of the back 9 pole terminal board.
The heat request occurs when boiler thermostat closes the contact.
Even with this configuration the Aux output is configured as a potential free contact to control the 3-way valve (contact 7-8-9 of the back
9 pole terminal board).
• Puffer probe
To activate this option, connect a probe (NTC 10KOhm at 25°C b=3435) to points 1 and 2 of the back 9 pole terminal board.
The heat request occurs when the boiler probe reads a temperature that is 2°C below the one set by the accumulation temperature marked
by a radiator in the temperature menu.
During the installation with puffer, stove operation is only and exclusively determined by the puffer probe and not by the room probe. The
purpose of the room probe on the stove is only to control the heating system pump controlled by the potential free contact N.O.: (max 5
ampere, not suitable for brushless pumps with upper start-up current) on terminals 8-9.
Example of operation with Hydro Air On or Auto:
• if the puffer is satisfied but the room probe is not, with eco stop active the stove shuts off (continuing to disburse heat through the
room fan up until shut-off)
• if the puffer is satisfied but the room probe is not, with eco stop deactivated, the stove remains on at minimum power. In this case
hot water from the puffer is used through the pump to heat the front radiator
• if the puffer calls for heat and the room probe does not, the fan behaves based on “Hydro Air” and “Ventilatore” (Fan) settings.