Install Instructions

IS-FS-204-W
Instructions for Installing FS-204-W
General Purpose Liquid Flow Switch Indoor/Outdoor
Sizes: 1" – 6"
The Watts FS-204-W Flow Switch is used to start or stop
electrically operated equipment such as burners, pumps or
alarms by detecting liquid flow through piping. It is designed for
use in water media applications and is not intended for use in
hazardous or corrosive fluids. The FS-204-W is suitable for wet
locations.
WARNING
!
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information
can result in death, serious personal injury, property
damage, or damage to the equipment.
Keep this Manual for future reference.
Flow Switch Location
The preferred installation of the FS-204-W is in a horizontal pipe with a straight run of at
least 5 pipe diameters on each side of the paddle (Figure 1). There should be no restric-
tions from elbows, valves, orifices, etc. Refer to Table 1 below for flow rates.
The Flow Switch can be installed in a vertical pipe only if the flow direction of
the liquid is upward. Table 1 does not apply to vertical installations.
WARNING
!
Electrical shock hazard. To prevent electrical shock,
death or equipment damage, disconnect power supply
before installing or servicing control.
Local building or plumbing codes may require modifica-
tions to the information provided. You are required to
consult the local building and plumbing codes prior
to installation. If the information provided here is not
consistent with local building or plumbing codes, the
local codes should be followed. This product must be
installed by a licensed contractor in accordance with
local codes and ordinances.
WARNING
!
CAUTION
!
• To prevent serious burns, boiler should be thoroughly cooled
before installing or servicing control.
• The FS-204-W is designed as an operating control. It is the
responsibility of the installer to provide safety or limit control on
installations where an operating control failure would result in
personal injury and/or property loss.
• The FS-204-W is not intended for use in explosive environments.
FIGURE 1
Dimensions
3.375
5.656
2.5
TABLE 1 FLOW SPECIFICATIONS
PIPE SIZE 1" 1
1
⁄4" 1
1
⁄2" 2" 2
1
⁄2" 3"
FLOW
INCREASES 4.5 8.1 11.8 16.5 25 33 51 85
*
120
*
FLOW DECREASES 2.2 6.8 7.6 9.3 19 22 38 75
*
100
*
FLOW INCREASES 14.8 22.1 25.7 32.3 75 90
*
110
*
170
*
240
*
FLOW DECREASES 13.8 20.1 23.7 30.5 72 85
*
100
*
155
*
220
*
*Calculated for various pipe sizes. Flow rates may vary ±10% from values above.
MINIMUM
ADJUSTMENT
MAXIMUM
ADJUSTMENT
4" 5" 6"