Routine Maintenance - Pall UR629 Serie Notice D'entretien

Ultipleat
R E T U R N L I N E F I LT E R S
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 vent valves are closed.
(b) Open left hand housing vent port.
(c) Position change-over valve to the left, to allow flow through left
hand housing.
(d) 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. Pressurize system fully and check for
leaks; if leaks occur refer to section 5.
(e) Open right hand housing vent port.
(f) 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.
(g) Fully pressurise and check for leaks. If any leak is apparent shut
down, depressurise and rectify leak before proceeding.
(h) 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.
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. 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.
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.
SRT
®
UR629/649/669/689 Series
s e r v i c e i n s t r u c t i o n s
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'.
Figure 1 - Switch Circuit Diagram
A or white
or tag 1
B or red
or tag 3
3
LOW DIFFERENTIAL PRESSURE
C or black or tag 2
HIGH DIFFERENTIAL PRESSURE