Unigas TP90A-TP91A, Руководство по установке, использованию и обслуживанию

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PART I: INSTALLATION MANUAL
25
ADJUSTING AIR AND GAS FLOW RATES
Gas Filter
The gas filters remove the dust particles that are present in the gas, and prevent the elements at risk (e.g.: burners, counters and regu-
lators) from becoming rapidly blocked. The filter is normally installed upstream from all the control and on-off devices.
Integrated proving system (burners equipped with LME7x, LMV, LDU)
Fig. 4
Keys
1 Gas filter
2 Gas proving system
3 Gas valves
4 Combustion head adjusting screw
5 Adjusting cam
6 Actuatori
3
4
5
1
2
6
PS
EV1 EV2
/
EV2
EV1
PGCP
This paragraph describes the integrated proving system operation sequence:

At the beginning both the valves (EV1 and EV2) must be closed.

Test space evacuating: EV2 valve (burner side) opens and keep this position for a preset time
(td4), in order the bring the test space to ambient pressure.Test atmospheric pressure: EV2 clo-
ses and keep this position for a preset time (test time td1). The pressure switch PGCP has not to
detect a rise of pressure.

Test space filling: EV1 opens and keep this position for a preset time (td3), in order to fill the test
space.

Test gas pressure: EV1 closes and keep this position for a preset time (td2). The pressure switch
PGCP has not to detect a pressure drop down.
If all of the test phases are passed the proving system test is successful, if not a burner lockout
happens.
On LMV5x and LMV2x/3x and LME73 (except LME73.831BC), the valve proving can be parameteri-
zed to take place on startup, shutdown, or both. On LME73.831BC the valve proving is parameteri-
zed to take place on startup only.