SS-200-035 1 I56-4175-002
WFDNA Series Vane-type Waterflow
Detectors
INSTALLATION AND MAINTENANCE INSTRUCTIONS
6581 Kitimat Road, Unit 6, Mississauga, Ontario L5N-3T5
1-800-SENSOR2, FAX: 905-812-0771
www.systemsensor.ca
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.
CAUTION
The model WFDNA 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 de-
tectors used in these types of systems may result in an unintended discharge
caused by a surge, trapped air or a short retard time.
WARNING
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 WFDNA’s have a pneumatically
controlled 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.
Model
Pipe Size
(inches)
Pipe
Schedule
Max. Pressure
Rating (psig)
WFD20NA
2
7 thru 40
450
WFD25NA
2.5
7 thru 40
450
WFD30NA
3
7 thru 40
450
WFD40NA
4
7 thru 40
450
WFD50NA
5
10 thru 40
450
WFD60NA
6
10 thru 40
450
WFD80NA
8
10 thru 40
450
SPECIFICATIONS
Contact Ratings:
10 A @ 125/250 VAC
; 2.5 A @ 24 VDC
Triggering Threshold Bandwidth (Flow Rate):
4 to 10 gpm
Static Pressure Rating:
See models listed below
Dimensions, Installed:
2.6 in H x 3.5 in W x 6.7 in D
Operating Temperature Range:
32°F to 150°F (0°C to 66°C)
Compatible Pipe:
Steel water pipe, schedule 7 through 40 (See chart below)
Shipping Weight:
3 to 6 lbs (according to size)
Enclosure Rating:
NEMA Type 4, as tested by Underwriters Laboratories, Inc.
U. S. Patent Numbers:
5,213,205
CAUTION
Do NOT use any of the WFDNA models on copper pipe. The clamping forces
of the mounting bolts may collapse the pipe sufficiently to prevent the detec-
tor 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
CAN/ULC S524:
Installation of Fire Alarm Systems
Other applicable Canadian and NFPA standards, local codes, and the re-
quirements 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 associ-
ated 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 accidental
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 hous-
ing and impair the operation of the detector. For vertical flow applications,
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 direc-
tion 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.
CAUTION
When drilling the hole with a hole saw, make certain that the center of the cut
does not remain in the pipe.
