English (GB)
16
6.4 Possible faults
7. Maintenance
Rates for cleaning and maintenance:
• at least every 12 months
• in case of malfunction
8. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
Fault
To be recognized by
Cause
Correction
Gas leakage
Gas odour
Formation of mist at the connections
when checking the tightness
Connections not tight
Check connections and retighten them
Gas escapes at the overpressure
line while the plant is not running
Inlet valve not tight
Call the service
Loss of pressure at the manometer
while the plant is not running and
the gas supply is closed
Inlet valve or connections
not tight
Call the service
Overpressure valve not
tight
Vacuum present in the overpressure
line while the plant is running (to be
felt by putting on a finger)
Spring corroded or soiled
Call the service
O-ring (19) defective
Replace o-ring (19)
Diaphragm defective
Call the service
Disturbed regulation
Vibrations and booming of the
device
Diaphragm distored or
mounted incorrectly
Call the service
Desired dosing flow is
not
reached
Vacuum present in the overpressure
line while the plant is running (to be
felt by putting on a finger)
Diaphragm damaged
Call the service
Pressure gauge of the vacuum
regulator
Admission pressure too low
(< 2 bar)
Call the service
Gas container empty
Replace gas containers by full ones
Shut-off valves in the
pressure lines closed or not
perfectly open
Open the shut-off valves
Re-liquefaction of the
gas
Formation of ice on filter or pressure
line connection during start-up,
damages of PVC enclosure parts
(only visible when the device is
open)
Temperature at the pressure
line connection lower than
the temperature of the other
pressure gas lines
Wrap a heater band around the filter and/
or the pressure line connection and warm
them up. Close gas supply before the
filter, adjust the gas dosing system to
minimal dosing flow and start the plant
Heating of the liquid trap not
connected or defective
Call the service
Vacuum regulator without
liquid trap used with gas
drum
Use a vacuum regulator with a liquid trap
Warning
Do not open the device!
Cleaning, maintenance and repair only by authorized
personnel!
Warning
Switch off the whole plant before doing cleaning and
maintenance work!
Danger of gas break-out!
Warning
Check the tightness before restarting!
Danger of gas break-out!
