ICI Caldaie NEOX125 Manual Of Installation - Use - Maintenance Download

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PART III: OPERATION

ADJUSTING AIR AND GAS FLOW RATES

Adjustments - brief description

The air and fuel rates adjustments must be performed at the maximum ouptput first (“high flame”): see the LMV5.. related manual..



Check that the combustion parameters are in the suggested limits.



Check the flow rate measuring it on the counter or, if it was not possible, verifying the combustion head pressure by means of a dif-
ferential pressure gauge, as described on par. “Measuring the gas pressure in the combustion head”.



Then, adjust the combustion values by setting the “gas/air” ratio” curvepoints (see the LMV5.. related manual).



Set, now, the low flame output, in order to avoid the low flame output increasing too much or that the flues temperature gets too low
to cause condensation in the chimney.

(First) Start-up preliminary operations - gas supply

Recommended actions to be carried out in sequence:
1

Check the burner and all its components are installed correctly

Check that all electrical and mechanical parts are connected correctly

Check that there is water or other vector fluids in the generator

Check that the ventilation gates/dampers in the plant are open and the stack is free

Connect the gauges used to adjust and check pressures on the incoming line and on the head, air and fuel side.

Open the thermostatic series and the safety chain

Turn the main switch on the panel front with the "MAN/AUTO" selector to position "0".

Select the GAS mode with the fuel selector on the front of the panel (if any)

Check the phase and neutral position is correct

10 Open the manual shut-off valves slowly, in order to prevent any water hammers that might seriously damage valves and pressure

regulator

11 Check the sense of rotation of the electrical motors
12 Bleed the line, getting rid of all the air in the pipe as far as the main gas valve
13 Ensure the pressure entering the main valves is not excessive due to damage to or wrong adjustment of the line pressure regulator
14 Ensure the gas supply minimum pressure is at least equal to the pressure required by the pressure curves - burnt gas flow

Start-up procedure

Turn the burner on.

the LMV control box starts the system test cycle: the AZL display shows the

System Test

message; at the end of the test, it shows

the main page and the system stops (the safety chain is open) waiting for the startup enabling signal (standby - Program phase no.
12)

WARNING! During commissioning operations, do not let the burner operate with insufficient air flow (danger of
formation of carbon monoxide); if this should happen, make the fuel decrease slowly until the normal combustion
values are achieved.
WARNING! the combustion air excess must be adjusted according to the values in the following chart.

Recommended combustion parameters

Fuel

Recommended (%) CO

Recommended (%) O

Natural gas

9,0 ÷ 10

3,0 ÷ 4,8

LPG

11 ÷ 12

2.8 ÷ 4,3

DANGER! Venting the air from the piping must take place in safe conditions, avoiding dangerous concentrations

of fuel in the rooms. You must therefore ventilate the rooms and wait long enough for the gases to dissipate out-