Unigas G335A, Installation Manual

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38
Warm setting
1 Once pressed button
“
enter
”
and the chain thermostats open (X5-03 terminals), the LMV.. show Ph12.Then close the chain
termostat and the unit performs the prepurge cycle (see “Phases List”) and stops at the ignition point P0 without ignition anyway.
2 By pressing “+”, the burners lights abd the air/fuel ratio can be properly set in presence of flame.
3 By pressing “+” again, the next point P1 is shown (eqaul to P0 as the unit automatically set P0=P1);
4 By pressing “+” again, the “Calc” message will be displayed: the unit is processing the sir/fuel ratio curvepoints until point P9, pre-
viuosly set. Once the processing is perfomed the calculated point P2 is shown.By pressing “+” again, the “Calc” message will be
displayed: the unit is processing the sir/fuel ratio curvepoints until point P9, previuosly set. Once the processing is perfomed the
calculated point P2 is shown.
5 By pressing “+”, it is possible to go through the processed curve until point P9 is reached.
Note:
if the point doesn’t blink, servomotors are still running.
6 n order to set P9 with the gas flow rate according to the generator needs, follow this procedure:
Note: the purpose is to fully open the gas throttle and later on to adjust the gas flow rate through the gas pressure governor.

Operate smoothly opening by just a few degrees the air damper and later on increasing the gas throttle opening it by a few
degrees. Keep monitoring the flue through the flue analyser. Keep the air excess inside normal figures (from 3% to 7% residual O2)
operating by means for the air damper servomotor;

Keep increasing the air damper opening and then the gas throttle, as done in the sequence above, remebering to get the full firing
rate wih the gas throttle fully open (or the oil pressure regulator at its maximum pressure position).
See example below:

If, while opening the gas throttle, the gas flow rate was too high, reduce it only through the gas governor and keep opening the
throttle until the
60÷70
° position is got.

If the gas train is equipped with a governor and a valve with an adjustable gas flow rate, fully open also this last valve, smoothly!
The gas flow rate is always set by means of the governor.
7 As soon as all the devices are fully open, set the gas flow rate through the governor.
8 Set the air damper position in order to get the reccomended air excess (3÷4.8% O2 on gas and 2.9÷4.9 % on oil).
Note1
: on high flame, if the gas flow rate is changed by means of the governor, all the other points below high flame must be checked
again.
9 After having set the high flame point P9, keep “-” pressed for some seconds unitl “Calc” is displayed in order to have the LMV recal-
culating all the points:
10 the unit will automatically reach point P8 processed: check the combustion values in this point and, if necessary, change it.
11 Press “-” to go down to the lower points and check the combustion values, change the points if necessary.
Note:
if in an intermediate point (for example P5), the change of the actuators position is important according to the processed point
Fuel
Air