Compac CNG Service Manual page 37

Dispenser Operation
Fixed Pressure Refuelling Process
Compac Industries Ltd.
The technical operation of a fixed pressure refuelling dispenser is as
follows:
1. Press the start button or remove the nozzle from the holster to
initiate a fill.
The display will show
the gas and value totals will display
2. Connect the refuelling nozzle to the vehicle
3. The refuelling valve is opened and the filling commences as
follows:
 If the vehicle tank pressure is less than low bank pressure,
gas flows from the low bank.
 When the vehicle tank pressure equals the low bank
pressure but is less than the medium bank pressure, gas
flows from the medium bank.
 When the vehicle tank pressure equals the medium bank
pressure but is less than the high bank pressure, gas flows
from the high bank.
4. When the flow rate drops below the minimum flow rate (LFA or
LFB
while filling from the high bank, the flow ceases, ending the
fill.
The sequencing rate between banks can be varied for
Fast, Normal or Slow rates using the Parameter menu. The factory
setting is normally set to Fast. Refer to Sequencing Rate (see page
22)
The vehicle fill pressure is restricted to the regulator set
pressure, this is normally set at 200 bar in the factory.
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and then clear, at this point both
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Refuelling a Vehicle