3
ENGLISH
RETURN LINE FILTERS
s e r v i c e
i n s t r u c t i o n s
UR629/649/669/689 Series
Athalon
®
4.8 Ensure the valves immediately upstream and
downstream of the filter assembly are closed.
Commission filter assembly as follows:
NOTE: For UR649, UR669 or UR689 units, the following
procedure applies to each housing.
(a)
Ensure that drain and commuter valves are closed.
(b)
Open left hand housing vent port.
(c)
Open commuter valve (three full turns max) purge all
air (16).
(d)
Position change-over valve to the left, to allow flow
through left hand housing.
(e)
Bleed filter by opening the vent plug (10) on the cover
(5) of the filter one and one half turns. Jog system and
fill filter until all air bleeds through the plug (filter can be
optionally filled using the fill port (12)), then tighten plug.
Close commuter valve (16). Pressurize system fully and
check for leaks; if leaks occur refer to section 5.
(f)
Open right hand housing vent port and commuter valve.
(g)
Open commuter valve (three full turns max) purge all air
(16).
(h)
Position change-over valve to right, to allow flow through
right hand housing. Close vent port when bubble free
fluid issues from port and torque tighten to 12 ft/lb or 16
Nm. Close commuter valve (16).
(i)
Fully pressurise and check for leaks. If any leak is
apparent shut down, depressurise and rectify leak
before proceeding.
(j)
On completion of test sequence, position change-over
valve to place selected housing on stream.
NOTE: Cover the visual warning device and nameplate if
painting of the assembly takes place.
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. Body assembly is
permanently assembled at the factory: do not attempt to
disassemble the head (1), body tube (2), center post (3),
change-over valve (14) or check valve (15).
5.3 Differential pressure devices actuate when the filter
element (8) 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.
5.5 Make sure element change labels are clean and
undamaged. Replace illegible labels with the appropriate
new labels.
6
Differential pressure devices
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 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, replace element.
NOTE: Option ‘P’ visual indicator has thermal lockout and
manual reset. No signal below 0° C (32° F), signal above
27° 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.
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 decreasesbelow the pre-set value,
continuity returns to ‘C’ - ‘A’.
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.
CAUTION:
Continued operation of 629 series bypass filters (valve
options A, B and G), with differential pressure device
actuated, can allow unfiltered flow downstream.
Continued operation of 629 series non-bypass filters
(valve options W or N may cause collapse or premature
fatigue failure of the plugged filter element, which could
allow contaminant and unfiltered flow downstream.
Refer to element change instructions in section 7.
