Unigas R75A, Руководство по установке, использованию и обслуживанию

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PART II: INSTALLATION
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3.5 Gas Filter (if provided)
The gas filters remove the dust particles that are present in the gas, and prevent the elements at risk (e.g.: burner valves, counters and
regulators) from becoming rapidly blocked. The filter is normally installed upstream from all the control and on-off devices.
3.6 Integrated proving system (burners equipped with LME7x, LMV, LDU)
This paragraph describes the integrated proving system operation sequence:
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At the beginning both the valves (EV1 and EV2) must be closed.
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Test space evacuating: EV1 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: EV1 closes and keep this position for a preset time (test time td1). The
pressure switch PGCP has not to detect a rise of pressure.
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Test space filling: EV2 opens and keep this position for a preset time (td3), in order to fill the test space.
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Test gas pressure: EV2 closes and keep this position for a preset time (td2). The pressure switch PGCP has not to detect a pres-
sure 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 parameterized to take place on startup, shut-
down, or both.
On LME73.831BC the valve proving is parameterized to take place on startup only.
ATTENTION: it is reccomended to install the filter with gas flow parallel to the floor in order to prevent dust fall
on the safety valve during maintenance operation.
PS
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EV1
EV2
PGCP