Selection Of Flow Temperature In Heating Mode. (Not Possible On Cascade Systems); Pump Anti-Block Function; Heating Anti-Freeze Function; Maintenance - Meridian 5.24 Installation & Operating Instructions Manual

iii. the selector from the Off position to the Reset position.
b) A number for the parameter selected with the sanitary knob is shown on the left of
the display in small digits whereas the value is displayed in large digits: maximum
heating power is adjusted with parameter 1.
c) to modify the desired parameter: turn the thermo knob. The displayed value is a
percentage of the maximum power of the generator. Therefore, an adjustment of
80 means that the heating operates at a maximum of 80% of the nominal power.
Once the value has been set, it is stored by moving the selector from the Reset to
the chimney sweep position. When it has been stored, the display digits stop
flashing. Going from one parameter to another without storing does not modify the
existing settings.
d) To quit this function, simply move the selector to the Summer, Winter or Off
position or wait 30 seconds after the last operation.
The MERIDIAN boilers are balanced to function at 18 kW for heating for MERIDIAN 5.24
and 25 kW for MERIDIAN 5.32
3.9 Selection of flow temperature in heating mode. (not possible on cascade
systems)
It's possible to choose between two temperature flow range on heating phase, making use
two cable available at the electric panel exit where connect a room thermostat for high
temperature zone and one for low temperature zone. All information is available at chapter
2.8
3.10 Pump anti-seize function
When the selector is in the sanitary position, the boiler has a function which starts the
pump at least once every 24 hours for a duration of 3 minutes in order to reduce the risk
that the circulator gets blocked because of prolonged inactivity.
When the selector is in the Heating position, the pump anti-block function is activated
every 3 hours.

3.11 Heating anti-freeze function.

When the selector is in the sanitary or heating position, the boiler pump is activated when
the boiler temperature drops below 8° C until the temperature rises to above 10° C. If the
water temperature continues to drop to below 6° C, the pump and burner are activated until
the temperature reaches 25° C; during this period, the boiler operates at minimum power.
Any operating request in Sanitary, Heating or Chimney sweep mode forcibly stops the
function in progress in order to perform the request.

3.12 Maintenance.

Once a year perform the following tests and controls:
• Check and clean the main burner
• Check the correct adjustment of the gas input in DHW and CH functions
• Check the pump
• Test sensor operations
• Check the correct function of the ionisation on the burner control unit
• Check the safety valve on the CH circuit
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