6 Functional tests
NGW 300 / LGW 300 / GBW 300
604
6.3.8.5 Checking for accumulations of oil and
condensation in the gas pressure regulator
Possible accumulations of oil and condensate must be
drained by unscrewing the drain plug on the gas pressure
regulator. If larger amounts have accumulated, testing
must be done to establish whether the quarterly draining
interval was adhered to. If the result is positive, the
interval must be shortened.
In the event that solid particulate matter is found in the oil/
condensate, the gas pressure regulator must be replaced.
After the test, the drain plug for the CNG (NGW 300) gas
pressure regulator must be screwed in with a tightening
torque of 8 ±1 Nm. The drain plug for the LPG (LGW 300)
gas pressure regulator must be handscrewed.
PLEASE NOTE
•
For installed gas pressure regulator equipment with
an overhead drain plug, the oil/condensate can be
drained by means of the gas outlet of the gas pressure
regulator (1, fig. 603 u. 604). To accomplish this,
dismount the gas hose from the gas pressure
regulator and drain the oil/condensate out of the gas
pressure regulator and the gas hose.
•
If the gas pressure regulator’s connection port is not
accessible, then the oil/condensate can be drained by
dismounting the gas hose at the heater or via the gas
hose at the inlet of the delayed-action solenoid.
Therefore, the gas hose must be directed downwards.
•
Finally, reconnect the gas hose and secure with hose
clamps.
Fig. 603 CNG (NGW 300) Gas pressure regulator test
Fig. 604 LPG (LGW 300) Gas pressure regulator test
6.3.9 Test of the delayed-action solenoid in the
gas intake pipe
Test
–
Use 24 V direct current voltage.
Target state:
the solenoid must open after a delay of 1 second.
If the time is exceeded or undershot by
0.5 seconds, the delayed–action solenoid must be
replaced.
1 Gas outlet to the heater
2 Enrichment valve
3 Water outlet
4 Drain plug (oil)
5 Water inlet
6 Safety valve
7 Gas inlet from the storage tank
8 Intake valve
8
2
7
6
5
3
1
4
1 Gas outlet to the heater
2 Drain plug (oil)
3 Water inlet
4 Enrichment valve
5 Gas inlet from the storage tank
6 Intake valve
7 Water outlet
6
4
5
3
7
1
2
