ClimaCool UGW Manual - Manual (Page 56)

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54
Strainer Operation
Periodically, it will be necessary to flush out the debris that is
collected and settles to the bottom of the strainer reservoir .
CS-3 strainers must have a valve installed on the drainage
port. The larger CS strainers (4CS, 6CS, 8CS and 10CS) are
equipped with a flush port (or drainage port) extending inside
the strainer . When it becomes time to clean the strainer,
the flush port valve should be opened while the strainer is
in operation (while pressurized and with water flowing). A
thorough flushing of the strainer reservoir will depend upon
the length of time the flush valve remains opened. This flush
time will typically range from 15 to 60 seconds depending
on the flow, inlet water pressure and the amount of debris
collected by the strainer . As a general rule, the larger strainers
will require higher inlet water pressures in order to achieve
a complete flushing. For example, the 4CS model can be
flushed with inlet water pressures as low as 15-20 psi, while
the 6CS can be flushed with 30-35 psi. The 8CS and 10CS
models should be flushed with inlet water pressures greater
than 40 psi . Note: When shutting down the chiller for
extended periods of time, the strainer should be isolated
and completely drained.
Strainer Element Cleaning
If your strainer assembly is equipped with optional pressure
gauges, you will be able to monitor the pressure differential
between the inlet and outlet sides of the strainer . When this
pressure differential reaches 5-10 psi the strainer element
may require cleaning .
Caution: Prior to dismantling the strainer for cleaning, it
is imperative that the strainer assembly is isolated and
completely de-pressurized.
Follow the steps below when cleaning the CS strainer
element:
Step 1. (Bolted Lid Models): Remove the top of the
strainer by removing the Grade 5 Zinc plated bolts
from the lid .
Step 2. (Clamped Lid Models): Remove the top of the
strainer by taking off the band-clamp assembly.*
Step 3. Lift the strainer element (conical screen) out of
the strainer body .
Step 4. Carefully scrub down the strainer element with
a rigid nylon brush until all matter is loosened .
Do not use a steel brush.
Step 5. Wash the strainer element off with clean water.
It is preferable to use a hose with a significant
amount of water pressure .
Do not use a pressure washer.
Step 6. Wash all matter from the strainer gaskets and
clean the inner-ring where the bottom of the
strainer element rests .
Step 7. Make sure the U-shaped gasket is fitted securely
to the bottom of the strainer element .
Reposition the strainer element into the body of
the strainer .
Step 8. Make sure the strainer head gasket is secure
on top of the strainer body . On V-band models,
O-rings should be seated completely in the body
flange. Reposition the strainer lid back on the
strainer body . Tighten the lid securely either with
the bolts or with the band-clamp.
* For clamped models, opening and closing is achieved
without adjusting the lock nut . It is tightened at the
factory to the correct compression. (Minor tightening
may be necessary if the gasket loses memory over time .)
To open the clamp, depress the safety latch and pull the
over-center lever outward . To close the clamp, make
sure the T-bolt is seated in its receiver and push the
over-center lever back toward the strainer housing .
Be sure that the safety latch is engaged before putting
the unit to use.
What is Water Hammer?
Water hammer is a phenomenon that can occur in fluid
systems with long pipes . Water hammer is a rapid change
of pressure caused by a rapid change in velocity. If the flow
has been abruptly shut off downstream, the pressure in the
entire system is raised very quickly .
Figure 21 - Recommended Torquing Sequence
Note: The 3CS strainer torque is in lbs (not ft. lbs).
Table 1
Strainer Bolt Size
(inches)
Recommended
Torque
(ft. lbs)
3CS 5/16 - 18 60 - 80
4CS 3/8 - 16 15 - 25
6CS 1/2 - 13 45 - 55
8CS 1/2 - 13 45 - 55
10CS 5/8 - 11 80 - 100
Table 2
Stainless Steel Strainer Option