Unigas LMV5 Series Manual Of Installation - Use - Maintenance page 22

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 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.
22
PS
EV2 EV1
EV1
EV2
PGCP
/