Unigas G258A Manual Of Installation - Use - Maintenance page 24

PART II: INSTALLATION
Integrated proving system (burners equipped with LME7x, LMV, LDU)
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 closes 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
parameterized to take place on startup, shutdown, or both.
On LME73.831BC the valve proving is parameterized to take place on startup only.
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EV2 EV1
EV1
EV2
PGCP
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