Unigas HR2050, Manual Of Installation - Use - Maintenance, Page: 35 / 80

PART III: OPERATION
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The user interface is made of:
1. display: it showes menus and parameters
2. ESC key (previous level): it goes back to the prevoius level menu or exits the programming mode without changing data.
3. ENTER key (next level): it confirms the data changing and jumps to the next menu/parameter.
4. SELECT keys: they select a menu item and change the parameter values.
As far as the settings, see the LMV5 related manual.
By following the “air/gas ratio” curvepoints setting procedure on the LMV5.. manual, adjusting the air and gas flow rates: check, conti-
nuosly, the flue gas analisys, as to avoid combustion with little air; dose the air according to the gas flow rate change following the steps
quoted below.
Once the throttle valve is completely opened, acting on the pressure stabiliser of the valves group, adjust the gas flow rate in the high
flame stage as to meet the values requested by the boiler/utilisation:
Start-up procedure
1 Turn the burner on.
2 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)
Main page
3 check the fan motor rotation (see related paragraph).
4 make the safety chain enabling the system to start up
5 the combustion cycle starts: the system will show the operating stages
- Prepurging (program phase no.30)
- Driving to ignition position (program phase no.36)
- Ignition position (program phase no.38)
- Fuel (the fuel solenoid valves open)
- Flame (the flame lights up)
- Driving to low flame (the actuator drives to low flame).
NOTE: the C and A , on the .
Once the ignition cycle ends, the main page is shown:
Setpoint 80°C
Act.value 78°C
Fuel GAS
Standby 12
Setpoint 80°C
Act.value 78°C
Load 24%
Flame 60%
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