Scott Safety AFU 2, Руководство пользователя

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6 AFU 2 & AFU 4
CHECK AFU
CHECK VENTS
Depress the small black plastic hose
tail on the underside of housing and
ensure that it operates correctly, (there
should only be light spring-pressure
resistance). If the vent valve is sticking,
the AFU must be sent for Servicing. The
weeping of liquid from the vent valve
indicates a malfunction of the auto-
drain valve. If this is the case, the AFU
should be sent for Servicing.
CHECK HOUSING
Check the housing for signs of abrasion,
corrosion or damage. If a fault is found,
the unit must be withdrawn from service
and the fault rectified in accordance
with the Service Manual.
CHECK PRESSURE
GAUGE
Check inlet pressure gauge to ensure
that it is un-damaged and functioning
correctly.
WARNING:
An inoperative pressure gauge may
result in hazardous dismantling of the
unit whilst it is still pressurised.
ROUTINE
MAINTENANCE
FIRST STAGE (AO) AND
SECOND STAGE (AA)
FILTER REPLACEMENT
CAUTION:
DO NOT use solvents to clean any part
of the equipment.
Note:
The numbers shown below in brackets,
eg (1), refer to item numbers on the
spare parts list contained in Section -
Spare Parts of this manual.
For part number information, please
refer to Section - Spare Parts of this
manual.
The first and second stage filter
elements will operate indefinitely
when only removing liquids from the
supply. However, the build-up of solid
contaminants becoming trapped will
lead to a pressure drop across the filter
element, indicated by the red ‘warning’
indicator operating.
It is recommended that filter elements
are renewed after a maximum period of
6000 hours in use or every 12 months,
whichever is sooner.
Isolate the AFU from compressed-air
supply.
Depress the small plastic hose tail
at the bottom of housing to de-
pressurise.
Unscrew lower housing anti-clockwise
from yoke, (a warning whistle will
sound if the housing has not been
fully de-pressurised). If this occurs,
re-tighten housing and repeat the step
above before re-commencing.
Unscrew filter element (1) or (2) and
discard. Fit replacement element,
ensuring that replacement O-Ring is
also fitted. Ensure that filters are fitted
in the correct position, ie: AO Filter (1)
is on the left side, (as illustrated) and
AA Filter (2) is on the right.
Fit new O-Ring to filter housing.
Lubricate O-Ring with silicone grease
if required.