Servicing Instructions; First Start-Up Tests; Settings (Stand Alone Settings) - Meridian 5.24 Installation & Operating Instructions Manual

3 SERVICING INSTRUCTIONS

3.1 First start-up tests.

Before starting up the boiler, check that:
♦ the fuel delivery line complies with current standards;
♦ the boiler is supplied with natural gas;
♦ it is connected to a 230V-50Hz network, has L-N polarity and earth connection;
♦ the boiler start-up occurs regularly;
♦ the regular amount of CO
♦ the maximum and minimum gas flow rates follow the standards;
♦ the main switch is working correctly;
♦ air/flue ducts terminals are not obstructed;
♦ the regulation components are working properly;
♦ the hot water production is regular and all hydraulic connections are completely sealed;
Do not start up the boiler if the controls do not satisfy the requirements.
3.2 Settings (stand-alone settings)
The wiring diagram and the layout of the electronic card are representing in fig 4.
The electric section is included into ABS control panel while the electrical connection is
included into the plastic box placed on the boiler lower side opening directly. On back
bottom there is a supply transformer.
Setpoint. The sanitary and thermo setpoints are adjusted using taps 40 and 41 on the
control panel respectively as shown in Fig. 1 and their value is shown on the
display for 5 seconds before returning to the normal display.
Boiler parameters. The taps are used to set the following parameters:
1) maximum heating power "01" –
2) frequent anti cycles "02" –
3) thermo post-circulation "03" –
4) Enabling solar control unit (0=OFF, 1= enabled ON) [to enable only if you use
the kit 2 Solar System probes optional]
This parameter enables the operation of solar integrated control unit. When it is
in position 1 the solar system is switched on and regulated by the control unit
also with the boiler selector in OFF. When set to a 0 the solar system is switch
off .
5) Differential ignition solar circulator
This parameter adjusts the ignition of the solar circuit pump(if the parameter 4
is set to 1). The pump starts when there is the difference in degrees between
the temperature of the solar collector and the temperature of hot sanitary
water.
For example: If you have chosen a temperature differential of 10° C and and
tank + 40° C, the pump will start when the solar collector will reach 50° C. If the
solar collector temperature is less than 20 ° C never will start the solar system
circulator.
6) Safety temperature tank (75-95)
in the flues is at the maximum and minimum flow rate;
2
34
set to 100%,
set to 10%
set to 30%.
Adjustment range 5 : 25
Adjustment range 75 : 95