ClimaCool UCR 30, 50 and 70 tons Manual - Manual (Page 58)

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58
Torque Specifi cations
Clamped Lid Models: CS strainer models 3CS and 4CS have
“over-center latch clamp” lid designs. The over-center
clamp does not require adjustment when installing or
removing the lid. The lock washer is set at the factory for
proper clamp compression and normally requires no fi eld
adjustment. Minor tightening may be necessary over time.
The lids are installed as follows:
1. Place the clamp around the strainer lid.
2. Latch the T-bolt with the receiver and push the latch
handle towards the strainer body until the safety catch
engages.
Bolted Lid Models: CS strainer models 6CS, 8CS and 10CS
have “bolted” lid designs. Grade 5 zinc-plated bolts, nuts
and washers are used to attach the lids to these strainers.
See Table 1 for proper lid bolt size and torque rating for each
strainer. (Exercise care when tightening the lid bolts so as
not to damage the strainer lid or housing).
It is important to follow the torque specifi cations as over-
tightening may result in premature failure of the bolts. It
is equally important to follow a star wheel torque pattern
when tightening the lid bolts (see Figure 2). The strainer lid
may not be seated down completely after the fi rst torque
sequence (this is especially evident on the larger strainers
such as the DS-8 and larger). A second torque sequence
should be adequate to seat the lid securely to the body.
Strainer Operation
Periodically, it will be necessary to fl ush 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 fl ush port (or drainage port)
extending inside the strainer. When it becomes time to
clean the strainer, the fl ush port valve should be opened
while the strainer is in operation (while pressurized and
with water fl owing). A thorough fl ushing of the strainer
reservoir will depend upon the length of time the fl ush valve
remains opened. This fl ush time will typically range from 15
to 60 seconds depending on the fl ow, 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 fl ushing.
For example, the 4CS model can be fl ushed with inlet water
pressures as low as 15-20 PSI, while the 6CS can be fl ushed
with 30-35 PSI. The 8CS and 10CS models should be fl ushed
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 diff erential
between the inlet and outlet sides of the strainer. When this
pressure diff erential 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 following steps 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.
Table 1
Strainer Bolt Size Recommended Torque
3CS 5/16” - 18 60 - 80 in. lbs.
4CS 3/8” - 16 15 - 25 ft. lbs.
6CS 1/2” - 13 45 - 55 ft. lbs.
8CS 1/2” - 13 45 - 55 ft. lbs.
10CS 5/8” - 11 80 - 100 ft. lbs.
Figure 2 Recommended
Torquing Sequence