Limitations Of Use - Unigas TLX2020 Installation Manual

PART III: OPERATION

LIMITATIONS OF USE

THE BURNER IS AN APPLIANCE DESIGNED AND CONSTRUCTED TO OPERATE ONLY AFTER BEING CORRECTLY CONNEC-
TED TO A HEAT GENERATOR (E.G. BOILER, HOT AIR GENERATOR, FURNACE, ETC.), ANY OTHER USE IS TO BE CONSIDE-
RED IMPROPER AND THEREFORE DANGEROUS.
THE USER MUST GUARANTEE THE CORRECT FITTING OF THE APPLIANCE, ENTRUSTING THE INSTALLATION OF IT TO
QUALIFIED PERSONNEL AND HAVING THE FIRST COMMISSIONING OF IT CARRIED OUT BY A SERVICE CENTRE AUTHORI-
SED BY THE COMPANY MANUFACTURING THE BURNER.
A FUNDAMENTAL FACTOR IN THIS RESPECT IS THE ELECTRICAL CONNECTION TO THE GENERATOR'S CONTROL AND
SAFETY UNITS (CONTROL THERMOSTAT, SAFETY, ETC.) WHICH GUARANTEES CORRECT AND SAFE FUNCTIONING OF
THE BURNER.
THEREFORE, ANY OPERATION OF THE APPLIANCE MUST BE PREVENTED WHICH DEPARTS FROM THE INSTALLATION
OPERATIONS OR WHICH HAPPENS AFTER TOTAL OR PARTIAL TAMPERING WITH THESE (E.G. DISCONNECTION, EVEN
PARTIAL, OF THE ELECTRICAL LEADS, OPENING THE GENERATOR DOOR, DISMANTLING OF PART OF THE BURNER).
NEVER OPEN OR DISMANTLE ANY COMPONENT OF THE MACHINE EXCEPT FOR ITS MAINTENANCE.
TO SECURE THE MACHINE, ACT ON THE ISOLATOR SWITCH. IN CASE OF ANOMALIES THAT REQUIRED A SHUT DOWN OF
THE BURNER, IT'S POSSIBLE TO ACT ON THE AUXILIARY LINE SWITCH, LOCATED ON THE BURNER FRONT PANEL.
IN CASE OF A BURNER SHUT-DOWN, RESET THE CONTROL BOX BY MEANS OF THE RESET PUSHBUTTON. IF A SECOND
SHUT-DOWN TAKES PLACE, CALL THE TECHNICAL SERVICE, WITHOUT TRYING TO RESET FURTHER.
WARNING: DURING NORMAL OPERATION THE PARTS OF THE BURNER NEAREST TO THE GENERATOR (COUPLING
FLANGE) CAN BECOME VERY HOT, AVOID TOUCHING THEM SO AS NOT TO GET BURNT.
WARNING: before starting the burner up, be sure that the manual cutoff valves are open and check that the
pressure upstream the gas train complies the value quoted on paragraph "Technical specifications". Be sure that
the mains switch is closed.
WARNING: never loose the sealed screws! otherwise, the device warranty will be immediately invalidate!
1 Turn to the "ON" position the main switch on the burner control panel.
2 Check the flame control device is not locked and eventually reset it.
3 Check the series of thermostats or pressure switches enables the burner to operate.
4 Check that the gas pressure in the gas network is sufficient.
5 The LMV opens, for some seconds, the EV2 valve and check, through the PGCP pressure switch (sse scheme on pag. 13), that
pressure between EV1 and EV2 is at 0 mbar. If pressure increases, it means that EV1 leaks and LMV locks out. Reset LMV (see
related manual) and check the gas valves.
5 The fan motor starts up, the actuator drives the air damper to its maximum position: the pre-purge phase starts.
6 During pre-purging, LMV opens EV1 for some seconds. Through PGCP pressure switch it checks that pressure increses and then
remains the same. Then LMV has finished the check cycle and enables the burner to operate. On the contrary, LMV will lock the
burner out. Reset the unit, see related manual.
7 Once pre-purging is accomplished, the air damper drives to ignition position (about 5°), the transformer is energised and the EV1
and EV2 main gas valves and the pilot valves are energised as well.
The flame must light in few seconds later the the gas valves opening, otherwise the LMV locks out. The burner is now oerating and the
actuator drives to high flame and stops a little higher than lo w flame position.
Some seconds after the gas valve opening, the burner drives to the load position requred by the plant.
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.
PART III: OPERATION
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