System Sensor WFDN Series Installation And Maintenance Instructions

INSTALLATION AND MAINTENANCE INSTRUCTIONS
WFDN Vane-type Waterfl ow Detectors
SPECIFICATIONS
Contact Ratings:
Triggering Threshold Bandwidth (Flow Rate):
Static Pressure Rating:
Dimensions, Installed:
Operating Temperature Range:
Compatible Pipe:
Shipping Weight:
Enclosure Rating:
U. S. Patent Numbers:
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. Follow only those instruc-
tions that apply to the model you are installing.
The model WFDN is a vane-type waterflow detector for use in wet-pipe fire
sprinkler systems only. Vane-type waterflow detectors shall not be used as the
sole initiating device in both deluge and preaction systems; waterflow detec-
tors used in these types of systems may result in an unintended discharge
caused by a surge, trapped air or a short retard time.
Installation must be performed by qualified personnel and in accordance with
all national and local codes and ordinances.
Shock hazard: Disconnect power source before servicing. Serious injury or
death could result.
Risk of explosion: Not for use in hazardous locations. Serious injury or death
could result.
PRINCIPLES OF OPERATION
Vane-type waterflow detectors mount to water-filled pipes in fire sprinkler
systems. Waterflow in the pipe deflects a vane, which produces a switched
output, usually after a specified delay. All WFDNs have a pneumatically con-
trolled mechanical delay mechanism. Delays do NOT accumulate; they reset
if the flow of water stops or drops below minimum triggering flow rate before
the entire delay has elapsed.
All switches actuate when the water flow rate is 10 gallons per minute or
greater, but will not actuate if the flow rate is less than 4 gallons per minute.
This System Sensor installation manual covers the following waterflow detec-
tors for fire sprinkler/fire alarm applications.
Pipe Size
Model
(inches)
WFD20N 2
WFD25N 2.5
WFD30N 3
WFD40N 4
WFD50N 5
WFD60N 6
WFD80N 8
SS-200-025
10 A @ 125/250 VAC
4 to 10 gpm
See models listed below
2.6 in H x 3.5 in W x 6.7 in D
32°F to 150°F (0°C to 66°C)
Steel water pipe, schedule 7 through 40 (See chart below)
3 to 6 lbs (according to size)
NEMA Type 4, as tested by Underwriters Laboratories, Inc.
5,213,205
CAUTION
WARNING
Pipe Max. Pressure
Schedule Rating (psig)
7 thru 40 450
7 thru 40 450
7 thru 40 450
7 thru 40 450
10 thru 40 450
10 thru 40 450
10 thru 40 450
; 2.5 A @ 24 VDC
Do NOT use any of the WFDN models on copper pipe. The clamping forces of
the mounting bolts may collapse the pipe sufficiently to prevent the detector
from functioning properly.
Do NOT install steel or iron pipe sections in copper piping for mounting a
waterflow detector. Incompatibility between the dissimilar metals causes bi-
metallic corrosion.
INSTALLATION GUIDELINES
Before installing any waterflow alarm device, be thoroughly familiar with:
NFPA 72: National Fire Alarm Code
NFPA 13: Installation of Sprinkler Systems, Sect. 3.17
NFPA 25: Inspection, Testing and Maintenance of Sprinkler Systems, Sect. 5.3.3.2
Other applicable NFPA standards, local codes, and the requirements of the
authority having jurisdiction
NOTE: Installation methods other than those listed in this installation manual
may prevent the device from reporting the flow of water in the event the asso-
ciated fire sprinkler system is activated by a fire. System Sensor is not respon-
sible for devices that have been improperly installed, tested, or maintained.
1. Mount the detector where there is adequate clearance for installation and
removal and a clear view of it for inspections. See Figure 1 for mounting
dimensions.
2. Locate the detector 6 to 7 feet above the floor to protect from acci-
dental damage.
3. On horizontal runs, position the detector on the top or side of the pipe.
Do not mount it upside down because condensation may collect in the
housing and impair the operation of the detector. For vertical flow appli-
cations, mount the detector on pipe through which water flows upward.
Otherwise, the unit may not operate properly.
4. Mount the detector at least 6 inches from a fitting that changes the direc-
tion of water flow and no less than 24 inches from a valve or drain.
5. Be sure the direction-of-flow arrows and directional cover match the di-
rection of flow in the pipe. See Figure 6.
MOUNTING INSTRUCTIONS
1. Drain the pipe.
2. Cut a hole in the pipe at the desired location. Center the hole on the pipe,
as shown in Figure 2, and be sure the hole is perpendicular to the center
of the pipe. Before drilling, use a punch or scribe to mark the drill site to
prevent the bit from slipping. If the hole is off center, the vane will bind
against the inside wall of the pipe. Use a drill or hole saw to cut a hole of
the proper diameter. See Table 1 for hole size.
When drilling the hole with a hole saw, make certain that the center of the cut
does not remain in the pipe.
1
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
CAUTION
CAUTION
I56-4045-002R
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