Watts FS20 User Manual
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MIN 5 X D
APPRO X IM A TE L Y 1 " USE H ALF CO UP LING
MIN 5 X D
D
REPLACEMENT KIT # DESCRIPTION
RK FS10-3-1 PADDLE A, B & C
RK FS10-6 PADDLE D
RK PRP-218-3957 “O” RING
RK-PRP-124 “O” RING
RK-PRP-152 “O” RING
USA: 815 Chestnut St., North Andover, MA 01845-6098 www.watts.com
CANADA: 5435 North Service Rd., Burlington, Ont. L7L 5H7 www.wattscanada.ca
INSTALLATION INSTRUCTION - WATTS TYPE NEMA 4X FS20 FLOW SWITCH
GENERAL APPLICATION: For indoors and outdoors installation of high humidity requiring watertight, dusttight and corrosion resistant enclosures.
TYPICAL CONDITIONS: - Equipment splashing water - Leakage or hose directed water - Wind blown dust and water
- Seepage of water - Severe general condensation - Sleet or icy conditions
IMPORTANT: Electrical installation must be performed by a qualified person and in accordance with all local codes.
LOCATION: Flow switch should be installed in horizontal or vertical section of a pipe or tube where there is a straight run of at least 5 pipe diameters
on each side.
MOUNTING: Flow switch should be installed vertically upright in tees or welded fittings.
ELECTRICAL INSTALLATION: Watertight and dusttight installations require the use of rigid galvanized metal conduit and fittings. Temperature
exceeding 180°F requires electrical wiring insulation rated at 75°C or 167°F. Select required mode of operation and electrical wire in accordance with
appropriate diagram (Fig. 1 or 2). Cover flange screws should be torqued to approximately 30-40 inch pound. Following mechanical and electrical instal-
lation, test flow switch for desired operation.
VERTICAL PIPE INSTALLATIONS: Flow rates for vertical installations are not available. However, the FS20 generally operates satisfactorily when in-
stalled in a vertical pipe with either upward or downward flow provided there is no amount of dirt or sediment in the water. In order to confirm satisfactory
operation, it is advisable to hold the FS20 in position to be installed and manually check for “no flow” switch operation (by hand operation of the paddle).
If a reducing tee is not available and a standard tee
is used, install a face bushing in top opening to
keep waterflow indicator as close to tee as possible.
If a welded fitting is to be used, use only a half
coupling. (Make sure hole in main is 1-5/32" dia.
before welding coupling.)
NOTE: PADDLE LENGTH CONFORMS TO
ASTM TEE STANDARD.
USE TEMPLATE BELOW TO TRIM
PADDLE TO REQUIRED LENGTH “L”.
ACTUAL SIZE TEMPLATE TO TRIM DIMENSION “L”
Always check operation of flow switch to make sure paddle
is free to move in the tee, coupling or pipe before finishing
the installation.
“L” refers to trim length in table.
• UNDERWRITER’S LABORATORY LISTED
• MAXIMUM PRESSURE 175 PSI
• MAXIMUM TEMPERATURE 300ºF
A. FINE SENSITIVITY
1. REMOVE SWITCH COVER.
2. FOR FINER SENSITIVITY, TURN
RANGE ADJUSTING SCREW
CLOCKWISE. LOCATED ON
LEVER NEXT TO MICROSWITCH.
B. COARSE SENSITIVITY
1. REMOVE SWITCH COVER.
2. FOR HIGHER FLOW RATE, TURN
RANGE ADJUSTING SCREW
CLOCKWISE. LOCATED WITH
ADJUSTING SPRING.
3. FOR LOWER FLOW RATE, TURN
COUNTER CLOCKWISE.
ADJUSTMENT
TO ADJUST SETTINGS, FOLLOW
A OR B INSTRUCTIONS. BE
SURE FLOW SWITCH COVER IS
REPLACED BEFORE LEAVING
JOB.
PIPE
SIZE
INSTALLATION USING
ASTM TEE
INSTALLATION USING
WELDED FITTING
PADDLE
TEE SIZE PADDLE
1” 1” x 1” x 1” 1”A Segment
1-1/4”
1-1/4” x 1-1/4” x 1”
1”A Segment &
Trimmed
2”B Segment
1-5/8”
1-1/2”
1-1/2 x 1-1/2” x 1”
1”A Segment &
Trimmed
2”B Segment
1-3/4”
2” 2” x 2” x 1” 1”A Segment &
2” B Segment
1”A Segment & 2”B Segment
2-1/2”
2-1/2” x 2-1/2” x 1”
1”A & 2”B
Segments &
Trimmed 3”C
Segments
1”A & 2”B Segments &
Trimmed 3”C Segments
2-3/4”
3” 3” x 3” x 1” 1”A, 2”B, & 3”C
Segments
1”A, 2”B, & 3”C Segments
4”
1”A, 2”B, 3”C, and
Trimmed 4”D Segments
4-1/4”
5”
1”A, 2”B, 3”C, and
Trimmed 4”D Segments
5-1/4”
6”
1”A, 2”B, 3”C, 4”D Segments
TRIMMED
DIMENSION
“L”
IMPORTANT:
Mount flow switch in position so that the paddle assembly is at a right angle to the flow. The stamped arrow on bottom plate mounting and label arrow on body must both
point in direction of flow.
1-1/8”
1-3/4”
1-5/8” 2-1/8” 2-3/4” 3-1/4” 4-1/4” 5-1/4”
6-1/4”
FLOW
FLOW RATES REQUIRED TO ACTUATE No. FS20 FLOW SWITCH IN HORIZONTAL PIPE
Flow rates in U.S. gallons per minute (GPM). Velocity in feet per second (FPS).
*Equipped with extended paddle trimmed to pipe size
*Flow rates for these sizes are calculated.
PADDLE LENGTH: Included with each flow switch are four paddles. Shortest paddle (A) can be used for 1" pipe size only.
Second shortest paddle (B) can be used as is with paddle (A) for 2" pipe size; but must be trimmed for 1-1/4" and 1-1/2" pipe size.
Third shortest paddle (C) can be used as is with paddle (A) and (B) for 3" pipe size, but must be trimmed for 2-1/2" pipe size.
Longest paddle (D) can be used as is with paddle (A), (B) and (C) for 6" pipe size, but must be trimmed for 4" and 5" pipe size.
(A) (B) (C) (D)
Extended
Paddle
Pipe Size in Which
Flow Switch Installed
1”
1-1/4”
1-1/2”
2”
2-1/2”
3”
*4”
*5”
*6”
Factory or
Minimum
Flow Setting
ACTIVATION
FLOW
GPM 5.2 7.9 10.0 13.2 20.9 30.0 39.0 58.0 79.9
FPS 2.01 1.74 1.62 1.29 0.92 1.30 1.0 0.94 0.88
DEACTIVATION
GPM 2.0 3.2 5.3 8.1 9.9 12.0 19.0 29.0 39.6
FPS 0.77 0.71 0.86 0.79 0.44 0.52 0.50 0.47 0.44
Maximum
Flow Setting
ACTIVATION FLOW
GPM 11.5 18.0 18.0 34.1 53.9 52.0 73.5 115.0 166.0
FPS 4.44 3.98 2.91 3.33 2.38 2.26 1.86 1.85 1.84
GPM 8.5 14.6 15.1 29.2 44.4 46.1 64.0 92.0 123.0
FPS 3.28 3.23 2.44 2.85 1.96 2.00 1.67 1.48 1.37
DEACTIVATION
Extended
Paddle
IS-FS20
EDP# 5003207 rev 3
COARSE
SENSITITY
ADJUSTMENT
FINE
SENSITITY
ADJUSTMENT
OPTIONS: “L” Pilot Light
“BSP” British Threaded Body
REPAIRS AND REPLACEMENT
PADDLES AND COVER MAY BE REPLACED IN THE FIELD. OTHER FIELD REPAIRS MUST NOT BE MADE. REPLACEMENT FLOW SWITCHES MAY BE
OBTAINED FROM THE NEAREST WATTS DISTRIBUTOR OR WHOLESALER. WHEN ORDERING A REPLACEMENT SWITCH, SPECIFY PRODUCT NUMBER
AS SHOWN ON THE FLOW SWITCH.
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Summary of Contents
Page 1 - (A) (B) (C) (D)
MIN 5 X DAPPRO X IM A TE L Y 1 " USE H ALF CO UP LINGMIN 5 X DDREPLACEMENT KIT # DESCRIPTION RK FS10-3-1 PADDL
Page 2
PIÈCES DE REMPLACEMENT DESCRIPTION RK FS10-3-1 PALETTES A, B & C RK FS10-6
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