System Sensor WFDT and WFDTH User Manual
Wfdt/wfdth vane-type waterflow detectors, Installation and maintenance instructions
N770-05-00
1
I56-0480-013R
WfDT/WfDTh vane-type Waterflow Detectors
insTaLLaTion anD mainTenance insTrUcTions
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
specificaTions
Contact Ratings:
Two sets of SPDT (Form C); 10 A @ 125/250 VAC
; 2.5 A @ 24 VDC
Triggering Threshold Bandwidth (Flow Rate):
4 – 10 GPM
Static Pressure Rating:
250 PSI (Max.)
Dimensions, Installed:
WFDT – 4
5
⁄
16
in H × 3
3
⁄
4
in W × 6
3
⁄
4
in D; WFDTH – 4
5
⁄
16
in H × 3
9
⁄
16
in W × 6
3
⁄
4
in D
Operating Temperature Range:
32°F to 120°F (0°C to 49°C)
Shipping Weight:
2.6 lbs
Enclosure Rating:
WFDT – NEMA Type 4, as tested by Underwriters Laboratories, Inc. (UL) (IP56)
WFDTH – Indoor use only, as tested by UL (IP10)
The WFDTH can be installed between 2×4 stud wall construction.
U.S. Patent Number:
5,213,205
imporTanT
Please Read Carefully And Save
This instruction manual contains important information about the installation
and operation of waterflow detectors. Purchasers who install waterflow detec-
tors for use by others must leave this manual or a copy of it with the user.
Read all instructions carefully before beginning.
CAUTION
Use vane-type waterflow detectors in wet-pipe systems only. DO NOT USE IN
DRY-PIPE, DELUGE, OR PRE-ACTION SYSTEMS. The sudden inrush of water
in such systems may break the vane off or damage the mechanism. Do not use
in potentially explosive atmospheres. Do not leave unused wires exposed.
principLes of operaTion
Vane-type waterflow detectors mount to water filled pipes in sprinkler sys-
tems. Water flow in the pipe deflects a vane. Deflection of the vane produces
a switched output, usually after a specified delay.
All WFDTs have a pneumatically controlled mechanical delay mechanism. De-
lays are noncumulative; they reset if the flow of water stops before the entire
delay has elapsed. All detectors will activate on a sustained flow of water
greater than 10 gallons per minute (gpm) but will not activate if the flow rate
is less than 4 gpm.
compaTibLe pipe Tees/risers
The WFDT and WFDTH fit 1- to 1
1
⁄
2
-inch NPT threaded ferrous and brass,
1- to 2-inch sweat brass, 1
1
⁄
2
-inch polybutylene plastic and 1-inch pvc plastic
tees having a 1-inch threaded NPT branch (see Figure 1 and chart for recom-
mended tee depths). For 2-inch cast and malleable threaded tees use 2-inch
paddle (p02-0023-000) provided. The WFDT and WFDTH also fits 1-, 1
1
/
2
-,
and 2-inch Reliable riser manifolds when used with paddle tree P02-0103-000
(purchased seperately). Use 1-inch CPVC paddle when installing detector on a
NIBCO 1-inch slip x 1-inch slip x 1-inch FPT.
APPROXIMATE TEE DEPTH REQUIREMENTS (SEE FIGURE 1)
Tee Depth
Threaded
Sweat
Poly B CPVC
CPVC/Spears/
Victaulic
CPVC/Tyco
1 Ч 1 Ч 1˝
2
1
/
8
˝
1
3
/
4
˝
N/A
2
1
/
4
˝
2
15
/
32
˝
2
13
/
16
˝
1
1
/
4
Ч 1
1
/
4
Ч 1˝
2
1
/
2
˝
2
1
/
6
˝
N/A
N/A
N/A
N/A
1
1
/
2
Ч 1
1
/
2
Ч 1˝
2
3
/
4
˝
2
1
/
4
˝
2
1
/
2
˝
N/A
N/A
N/A
2 Ч 2 Ч 1˝
3
1
/
4
˝
2
3
/
4
˝
N/A
N/A
N/A
N/A
figUre 1. moUnTing Dimensions:
INSTALLATION GAGE
END OF PADDLE TREE MUST
FIT BETWEEN TOP OF TEE
AND BOTTOM OF FLANGE
TEE FITTING
PLASTIC VANE
TEE DEPTH
REFER TO TEE
DEPTH TABLE
TEE
ADAPTER
3
3
/
4
˝
(WFDT)
3
9
/
16
˝
(WFDTH)
3˝
4
5
/
16
˝
W0126-00
insTaLLaTion gUiDeLines
Before installing any waterflow alarm device, be thoroughly familiar with:
NFPA 72: National Fire Alarm Code
NFPA 13: Installation of Sprinkler Systems
NFPA 25: Inspection, Testing, and Maintenance of Water-based Fire Protec-
tion Systems, Section 5.3.3.2
NFPA 13D: Standard for 1 and 2 Family Dwellings and Manufactured Homes
NFPA 13R: Standard for Multi-family Dwellings
Also, follow other applicable NFPA standards, local codes and the require-
ments of the authority having jurisdiction.
I56-0480-0
13R