Ariston microGENUS 27 MFFI Manuale di istruzioni per l'installazione - Pagina 17

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Ariston microGENUS 27 MFFI Manuale di istruzioni per l'installazione

3.4. I

NITIAL

TART

3.5

PERATIONAL

DJUSTMENTS

HE CHECKS TO BE RUN BEFORE INITIAL START

1. Make sure that:

- the screw on the automatic air valve has been loosened when the

system is full;

- If the water pressure in the system is below 1 bar, bring it up to the

appropriate level;

- Check to see whether the gas cock is closed;

- Make sure that the electrical connection has been made properly and

that the earth wire is connected to an efficient earthing system;

- Supply power to the boiler by turning the On/Off switch "A" (see F

- the L.E.D. "D" will illuminate - turn the selector knob "C" to the winter

/central heating position. This will start the circulation pump. After 7

seconds, the boiler will signal a shutdown due to ignition failure. Leave

the boiler as it is until all of the air has been bled from the lines.

- Loosen the cap on the head of the pump to eliminate any air pockets;

- Repeat the procedure for bleeding the radiators of air;

- Open the taps for a brief period;

- Check the system pressure and, if it has dropped, open the filling loop

again to bring the pressure back up to 1 bar.

2. Check the exhaust flue for the fumes produced by combustion.

3. Make sure that all gate valves are open;

4. Turn on the gas cock and check the seals on the connections, including

the one for the burner, making sure that the meter does not signal the

passage of gas. Check the connections with a soap solution and

eliminate any leaks.

5. Press the reset button "A" for the lighting system; the spark will light the

main burner. If the burner does not light the first time, repeat the

procedure.

6. Check the minimum and maximum pressure values for the gas going to

the burner; adjust it if needed using the values indicated in the table in

section 4 (See the relative section for burner pressure adjustment within

the servicing manual).

(See section 3.2 for references) it is possible to:

Set the temperature of the heating system by adjusting the knob "C"

Set the temperature of the domestic hot water by turning knob "B"

The selector knob "G" allows the user to choose the economy mode

(position "E") or the comfort mode (position "C").

The economy mode is the normal state for the operation of the boiler,

since the domestic water is heated up only when a tap is turned on.

The comfort mode is a special operating state, because the water

contained in the secondary exchanger and in the primary exchanger is

kept in a preheated condition, thereby allowing a quicker delivery of

domestic water when required. The latter is therefore the more

convenient choice.

To access the areas in which adjustments are made, it is necessary to open

the control panel, as indicated in section 3.3, then remove the rear

inspection cover by unscrewing the two screws. Access is thereby provided

to the P.C.B. and to the following components:

1. the power supply cable connector;

2. the fuses;

3. the soft-light potentiometer the setting for which can range from the

minimum thermal power to the maximum;

4. the maximum thermal heating power potentiometer adjustable by the

minimum to maximum power (already calibrated in the factory to 70% of

the maximum thermal power);

5. the potentiometer for adjusting the ignition delay (anti-cycling) feature,

which can be set from 0 to 2 minutes (set in the factory at one minute);

6. the time clock connector.

UP ARE AS FOLLOWS

.3.1)