Valve percentage
Flow rate
Front
Rear
INST
ALLA
TION
47
PULSE Installation, Commissioning and Servicing Manual - Revision 19
7.4 LPG Stack Test - Version 1.11
When installation is complete and fuel is available on site, perform a flow test for each
LPG hose to clear out all air and vapour from the supply lines, meters, internal pipework
and fittings and delivery hoses as follows:
1. Couple the LPG nozzle to the return line fitting and open the ball valve. Hold the
nozzle trigger open.
2. Put the dispenser in Service Mode (see Servicing - Section 12.1) and enter Stack
Test for Grade 1 (Servicing - Section 12.14).
3. Start the LPG pump by pressing the
1
key.
4. The valve percentage will show 40 (High Flow).
5. Open the valve by pressing the
3
(front valve) or
9
(rear valve) keys. Fuel flow
should be heard and flow rate registered in the bottom row of the grade 1 price
display. Wait while any ‘gassy’ noises cease and the flow settles to a steady value.
The flow rate displayed will be the high flow rate in L/pm.
6. Press
8
to adjust the valve percentage to 35 (low flow). The indicated flow rate
should drop to about 2 or 3 L/min.
7. Connect the other hose and repeat the procedure from 4.
8. Close the return line ball valve when finished. Press
C
to exit Stack Test.
9. If the expected flow rates are not achieved or all air and vapour is not properly
purged, then the cause must be investigated and rectified before proceeding to the
Trade Measurement Verification.
Check to ensure there are no leaks during the fuel flow test.
