Unigas HRX92R-FGR, Руководство по установке, использованию и обслуживанию, Страница: 25 / 132

PART II: INSTALLATION
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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.
Integrated proving system (burners equipped with LME7x, LMV, LDU)
OIL TRAIN CONNECTIONS
Hydraulic diagrams for light oil supplying circuits
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.
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.
PS
EV1 EV2
10 68 /1210
EV2
EV1
PGCP
1
3
2
Key
1 Manual valve
2 Light oil filter
3 Light oil feeding pump
4 One way valve
5 Flexible hoses
6 Relief valve
NOTE: in plants where gravity or ring feed systems are provided,
install an automatic interception device.
RING CIRCUIT GRAVITY CIRCUIT
SUCTION CIRCUIT