Waterflow Alarm Switch
Installation and
O
peration
I
nstruction
1
supply@bernofire.com
www.bernofire.com
Waterflow Alarm Switch(WAS)
1-
Product Overview
The Waterflow alarm switch usually installed in the main pipe or branch
pipe of the pipe system. This Switch is an important part of the automatic
sprinkler system. When the Paddle detects the water flow, the water flow
signal will be converted to electrical signal, and then switch on the alarm
system, at the same time, the fire zone will be indicated.
UL Listed, Vane-type Waterflow Alarm Switch mount to water-filled pipes
in fire suppression systems.
Waterflow Alarm Switch in the pipe deflects a vane, which produces a
switched output usually after a specified delay. Most of the Waterflow
Alarm switches have a pneumatically controlled mechanical delay
mechanism.
Waterflow Alarm Switch usually installed in the main pipe or branch pipe
of the sprinkler pipe system. When the vane detects the water flow, the
water flow signal will be converted to electrical signal, and then switch on
the alarm system or start the fire pump directly, at the same time, the fire
zone will be indicated.
Standard Specifications
Static Pressure Rating
450 PSI
Operating Temperature Range
32°F to 120°F (0°C to 49°C)
Maximum Surge
18 Feet Per Second (FPS)
Enclosure Rating
indoor use
Triggering Threshold
Bandwidth (Flow Rate)
4–10 GPM
Cover Tamper Switch
Standard with UL models
Conduit Entrances
Two openings for ½˝ conduit. One
open, one knock-out type
Compatible Pipe
Steel water pipe, schedule 10
through 40
Contact Ratings
Two sets of SPDT
(Form C) 10.0 A, ½ HP @ 125/250 VAC 2.5 A @ 6/12/24 VDC
NFPA-13
NFPA-13D
NFPA-13R
Service Use:
Automatic Sprinkler
One or two family dwelling
Residential occupancy up to four stories
National Fire Alarm Code
NFPA-72
CAUTION
Do not trim the paddle. Failure to follow these instructions may prevent the device from operating and will void the warranty. Do not
obstruct or otherwise prevent the trip stem of the Waterflow alarm switch from moving when water flows as this could damage the
Waterflow alarm switch and prevent an alarm. If an alarm is not desired, a qualified technician should disable the alarm system.
WARNING
- Please read the instructions carefully before installation, any damage caused by improper installation will not be liable for the
manufacturer.
- Before installation, check the nominal diameter, nominal pressure, temperature range and fluid of the Waterflow Alarm Switch, do not
install if the technical parameter of Waterflow Alarm Switch don't match the requirement of the pipe system.
- The Waterflow Alarm Switch can be mounted on horizontal or vertical pipe. On horizontal pipe it should be on the top of the pipe or the
side of the pipe, do not at the bottom of the pipe. On vertical pipe it should be mounted on the pipe which the water flow is upward.
- The pipe length before and after the Waterflow Alarm Switch must be no less than 5 times the pipe diameter, and choose the correct
Waterflow Alarm Switch according to the pipe nominal diameter technical parameter table.
- Waterflow Alarm Switch direction must be same as the arrow direction, must not be installed in opposite direction.
- Leave enough space for easy installation and maintenance.
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.
