ENGLISH
CONFIGURATION 3 – Zone heating -
Configuration identical to CONFIGURATION 1, with the addition
of a zone module to manage a system with up to four zones per
module, with zone valves or zone circulators. If the module is used,
parameter Pr90 must be activated in the TECHNIC SETTINGS in the
SETTINGS GENERAL page, setting the value to ON. The module
allows all thermostats to be received in input (CLEAN CONTACT)
and to activate the relevant outputs (CLEAN CONTACTS) that can
be used for zone valves or circulators. Connection between the
boiler and expansion module must include the terminal from the
module OC connector to the boiler green back panel OC terminal.
Zone module electrical power must be protected by the same circuit
breaker that powers the stove.
CONFIGURATION 5 – Puffer-
The boiler is connected to a Puffer (inert heat tank) and not directly
to the heating system. PUFFER TEMPERATURE must be set. Room
temperature control is not considered. However, make sure the
room probe type is set to THERMOSTAT in MENU 4 and that the
connection to the AMB PROBE terminal on the back of the boiler is
always electrically open.
In CONFIGURATION 5, the boiler only ensures that the temperature
probe connected to the PUFF Hi terminal meets set temperature
settings.
When the puffer temperature is met, the boiler switches to
ECONOMY mode, turning off the pump. When puffer temperature
drops 5°C (default value that can be adjusted in MENU 9 – TECHNIC
SETTINGS) under the set value, the boiler resumes operations at
the set power, turning the circulation pump back on when boiler
water temperature is higher than PUFFER TEMPERATURE.
In this configuration, the STAND-BY function is automatically
activated and turns the boiler off when in ECONOMY mode for a
period of time longer than that set in MENU 5 – SET STAND-BY, at
the DELAY OFF value.
When the boiler is in Stand-by, thus waiting to turn back on, the
only input that can turn the boiler on is the PUFF Lo probe value
which, at PUFFER SET TEMPERATURE - °C, permits restart. The
differential restart value can be set in MENU 9, password protected
for the service technician.
The zone module can be used with CONFIGURATION 5. In addition
to the room thermostats and zone valves or circulators, a secondary
circuit circulator can also be connected to the zone module.
For further information on zone module use, see the specific user
manual.
If the heat accumulator is equipped with an internal coil for DHW
production, summer mode can be set. In this mode the appliance
only considers Puffer temperature settings and ignores any zone
module and/or room requests.
For stove maintenance, if the zone module is
powered by a different mains than the stove, also cut off
module power. Electrical connections between the two
electronic parts could power the stove board even if
unplugged and vice versa. For further information on
zone module use, see the specific user manual.
WARNING
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Summary of Contents for MEC 21-18 kW
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