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Unless stated otherwise, all flow-
sensing devices must be
field-supplied. Be sure to follow the
manufacturer's recommendations
for device selection and installation.
Also, review the general flow switch
installation guidelines listed below.
1. Mount the flow switch upright in a
horizontal section of pipe. Allow at
least 5 pipe diameters of straight,
horizontal run on each side of the
switch.
Avoid locations adjacent to
elbows, orifices and valves
whenever possible.
2. To assure that the flow switch
operates as designed, adjust the
length of the flow switch paddle to
compensate for the pipe diameter
and the height of the coupling tee
used to install the switch.
3. Install the flow switch using a
coupling that is large enough to
allow the insertion of a bushing
one pipe diameter larger than the
flow switch base (Figure 12). This
will prevent interference with the
flow switch paddle.
Figure 12 – Flow Switch Installation
Pipe half coupling
5 pipe diameters
26
Water Piping
4. Verify that the direction-of-flow
arrow on the switch points in the
same direction as actual water
flow through the piping circuit.
5. Remove all air from the piping
circuit to prevent possible flow
switch "fluttering".
6. Adjust the flow switch to open
when water flow is less than
normal.
Evaporator and Condenser
Water Piping
Figures 13 and 14 illustrate the
typical water piping arrangements
recommended for the evaporator
and condenser.
Note: It is strongly recommended
that the piping contractor refrain
from piping closer than 3'-0"
minimum to the equipment. This will
allow for proper fit-up upon arrival of
the unit at the job-site. Any
adjustment that is necessary can be
made to the piping at that time.
Example Flow Switch
5 pipe diameters
Water piping connection sizes are
identified in Tables 3 and 4.
Remember that entering and leaving
evaporator and condenser water
must be piped in accordance with
the nameplate entering and leaving
orientation.
IMPORTANT
Water flows must be piped in
accordance with nameplate
designation.
Note: To assure that the evaporator
water piping is clear, check it after
the chilled water pump is operated
but before initial chiller start-up. If
any partial blockages exist, they can
be detected and removed to prevent
possible tube damage resulting from
evaporator freeze-up or erosion.
For applications that include an
"infinite source" or "multiple-use"
cooling condenser water supply,
install a valve bypass "leg"
(optional) between the supply and
return pipes; see Figure 14. This
valve bypass allows the operator to
short-circuit water flow through the
cooling condenser when the supply
water temperature is too low.
Note: To prevent operating
problems, pressure differential
between condenser and evaporator
should not fall below 3 psid.
To accommodate lifting apparatus,
lifting holes are provided in the
1 Pipe size larger
stiffening ribs of each evaporator
bushing to avoid
water box to enable attachment of a
paddle interference
swivel clevis (field-supplied).
Condenser water boxes are provided
with welded nuts that allow
installation of the eyebolt included in
the unit's loose parts-box.
CDHF-SVN01B-EN
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