Series DAFA Air Flow Indicator and Alarm
NE
FACTORY VANE
®
Specications - Installation and Operating Instructions
Bulletin AQ-DAFA
The Series DAFA Air Flow Indicator and Alarm alerts users of low or no air ow
conditions in pipes utilizing a thin, eld trimmable vane to sense the air ow rate.
An 85 dB audible buzzer alternates with a bright red LED to alert users when the air
ow rate drops, indicating low or no ow in the pipe. The DAFA is battery powered to
provide versatility for where it can be installed, and offers a yellow LED to indicate a
low battery. This device is ideal for monitoring radon mitigation systems by detecting a
loss of air ow in the pipe and providing a signal to homeowners if the fan has stopped
operating.
MOUNTING
Step 1: Drill a 3/4˝ hole in the system pipe
Step 2: Clean the area of the pipe where the air ow monitor will be mounted.
Step 3: If necessary, trim the vane as seen in Figure 1 for a 3˝ pipe.
Step 4: Attach the vane to the body of the air ow indicator and alarm.
Step 5: Peel the protective covering from the gasket.
Step 6: Slide the vane through the 3/4˝ hole in the pipe and seal the gasket to the
pipe.
Step 7: Install the battery following the instructions in the Battery Replacement
section of the manual.
NOTICE
changes in the actuation / deactuation points.
The ow switch has been designed to work in vertical pipes with
the ow
traveling upwards. Other congurations can lead to
5-1/8 [130.00]
1-15/32
[37.47]
3/4 [19.05] 3-33/64
SPECIFICATIONS
Service: Clean air.
Actuation Point: 15 CFM (4˝ pipe); 10 CFM (3˝ pipe) on decrease in ow.
Audible Alarm: At least 85 dB @ 1 foot distance.
Visual Alarm: Red LED for no ow alarm; Yellow LED for low battery.
Wetted Materials: ABS, polycarbonate, rare earth magnet.
Power Requirements: 3 V CR2450 lithium battery, included, user replaceable.
Battery Life: 5 years steady state; 48 hours during alarm state.
Temperature Limits: 32 to 122°F (0 to 50°C).
Mounting Orientation: Vertical.
Weight: 4 oz (113.4 g).
Agency Approvals: CE.
ALARM POINT
Visual and audible alarm cycle activates on decrease in ow at the points noted in
Table 1.
Table 1: Alarm Points
Pipe Size Alarm Point
3˝
4˝
10 CFM
15 CFM
[89.32]
2-3/32
[53.00]
4˝ PIPE INSTALLATION
Figure 1: Trimming Vane for 3˝ Pipe
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3˝ PIPE INSTALLATION
TRIM ALONG INDENTATIONS IN VA
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OPERATION
A
LOW/NO FLOW
A
The DAFA Air Flow Indicator and Alarm detects the air ow in a pipe by sensing the
position of the vane. When the fan is operating normally, the ow will lift the vane in
the upward position as depicted in Figure 2. As the air ow rate decreases the vane
will drop down as depicted in Figure 3. If the air ow rate drops below 15 CFM in a 4˝
pipe (10 CFM in a 3˝ pipe), the red LED on the front of the device will illuminate to give
a visual alert. If the ow does not regain within 30 s, the red LED will turn off and the
audible alarm will sound for 10 s. The visual and audible indicators will alternate in this
same pattern until air ow is regained or the battery is removed/drained.
LARM INDICATORS = OFF
AIR FLOW
Figure 2: Vane Position Under Normal Flow Conditions
AUDIBLE INDICATORS
No Air Flow: Off for 30 s; beeping for 10 s.
Low Battery: Chirp every 5 minutes
LED INDICATORS
No Air Flow: Solid red LED for 30 s; off for 10 s.
Low Battery: Flashing yellow LED.
TROUBLESHOOTING
• If fan appears to be operating and the DAFA Air Flow Indicator and Alarm is in the
alarm state, check to see if the vane was installed properly. The vane should be able
to travel in the direction of the air ow arrow.
• Next verify that there is no debris, moisture, or dust built up on the vane.
• Then check to see if the vane is hitting the wall of the pipe. If so, the vane may need
to be trimmed.
BATTERY REPLACEMENT
When the battery is low, a yellow warning LED will begin to ash and an audible alarm
will sound every 5 minutes to alert that it is time to replace the battery. Using a large
at head screw driver, turn the battery cover 1/4 turn in the direction of the arrows on
the cover. Remove the battery cover by lifting it up. Remove the coin cell battery from
its compartment. Insert a new 3 V CR2450 coin cell lithium battery in the compartment
with the positive (+) side of the battery facing up. Replace the cover and twist the cover
using the large at head screw driver in the opposite direction of the arrows.
MAINTENANCE/REPAIR
Upon nal installation of the Model DAFA, no routine maintenance is required. The
Model DAFA is not eld serviceable and is not possible to repair the unit. Field repair
should not be attempted and may void warranty.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sale” in our catalog and on our website. Contact
customer service to receive a Return Goods Authorization number before shipping the
product back for repair. Be sure to include a brief description of the problem plus any
additional application notes.
LARM INDICATORS = ON
Figure 3: Vane Position Under No Flow/Alarm Condition
Printed in U.S.A. 4/18 FR# 444428-00©Copyright 2018 Dwyer Instruments, Inc.
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