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UR229
D U P L E X F I L T E R A S S E M B L Y
(d)
Jog system and fill filter until all air bleeds through the
plug, then tighten plug. Pressurize system fully and
check for leaks; if leaks occur shut down, depressurize,
and repair leak before proceeding. Refer to section 5.2.
(e)
Depressurize the system.
(f)
Open right hand bleed plug a minimum of one and one
half turns.
(g)
Position change-over valve to allow flow through right
hand housing. Jog system and fill filter until all air bleeds
through the plug, then tighten plug.
(h)
Fully pressurize and check for leaks, if leaks occur shut
down, depressurize, and repair leak before proceeding.
Refer to section 5.2.
(i)
On completion of commissioning, position change-over
valve to select on-line side of housing.
CAUTION:
Failure to bleed the filter housing adequately will
increase the dissolved air content of the system fluid
which will shorten fluid life and may cause other
problems in the system.
5
Routine maintenance
5.1
Pall filters do not normally require special attention
except for periodic monitoring of the differential pressure
warning device. Schedule replacement of filter element
every six months or sooner, and have ample supply of
spare elements available.
5.2
If external leakage is noted, replace O-ring at leak. If
leakage persists, check sealing surfaces for scratches or
cracks; replace any defective parts.
5.3
Differential pressure devices actuate when the element
needs changing or because of high fluid viscosity in
'cold start' conditions. If 'cold start' conditions exist, see
Section 6.2 and 6.3.
5.4
A dirty system can quickly plug a new filter element,
especially with Pall high efficiency filter media. It may
require one or two initial element changes to stabilize
element life. If element life is short or differential
pressure is excessive, filter may be undersized; refer to
the sizing and selection section of the product literature
or contact your local Pall representative.
6
Differential pressure devices (optional)
Reference should be made to product literature for dimensions,
operating parameters, part numbering, ordering information
and specifications.
6.1
Differential pressure devices actuate when the element
needs changing or because of high fluid viscosity in
'cold start' conditions.
6.2
If a visual indicator is fitted and actuates during 'cold
start' (red button extends 5mm, 3/16"), reset by
depressing the button when the normal operating
temperature is reached. If indicator actuates after
resetting at normal operating temperature, replace
the element
NOTE: Option 'P' visual indicator has thermal lockout
and manual reset. No signal below 0°C (32°F), signal
above 29°C (80°F).
6.3
If the electrical switch actuates (e.g. red light comes on)
during cold start, continue operating until the signal (red
light) goes out as system warms to normal operating
temperature. This feature can be used as 'warm up'
indication in operating procedures. If the warning signal
(red light) remains or appears when system is warm,
replace the filter element.
UR229 Series
s e r v i c e i n s t r u c t i o n s
6.4
Use of both positive indication (green light) and negative
indication (red light for dirty element) is recommended to
effectively monitor filter element life.
Electrical connections and ratings for all differential
pressure switch options:
110 VAC
=
4A (inductive),
4A (resistive)
220 VAC
=
4A (inductive),
4A (resistive)
28 VDC
=
3A (inductive),
5A (resistive)
48 VDC
=
1A (inductive),
1.5A (resistive)
125 VDC
=
0.25A (inductive),
0.5A (resistive)
Maximum inrush - 24 amps.
Underwriter's lab. Inc. listed ratings of pressure switch
(Microswitch) options are:
4 amps at 250 VAC
0.25 amp resistive at 220 VDC
0.50 amp resistive at 110 VDC
Electrical differential pressure switch operation:
When preset differential pressure is exceeded continuity
switches from 'C' - 'A' to 'C' - 'B'.
When differential pressure decreases below the pre-set value
continuity returns to 'C' - 'A'.
Figure 1 - Switch Circuit Diagram
A
or white
or tag 1
B
or red
or tag 3
7
Filter element servicing
During servicing the external surfaces of the filter assembly
must be cleaned to remove any dust deposits. Servicing
must be conducted using suitable tools that do not present
a hazard. Do not service when a potentially explosive
atmosphere is present.
CAUTION:
Filter elements should be replaced upon indication or
at specified intervals, six months maximum. Failure to
change the element will cause the filter to go into bypass.
Refer to Pall Product Literature for item numbers for applicable
replacement element series. Remove and replace element as
follows:
WARNING:
FAILURE TO DEPRESSURISE THE FILTER BEFORE
SERVICING ELEMENT COULD RESULT IN EXPLOSIVE
LOSS OF FLUID, DAMAGE TO EQUIPMENT AND
POSSIBLE PERSONAL INJURY.
3
LOW DIFFERENTIAL PRESSURE
C
or black
or tag 2
HIGH DIFFERENTIAL PRESSURE
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