Labconco Guardian Jr. Airflow Monitor 9743200 Series - Manual (Page 11)

INSTALLATION
7
terminal on the white wire wiring harness #48610 by removing the terminal, stripping the
wire and installing a wire nut.
Locate the yellow wire on the hood blower switch. Remove the yellow wire from the
blower switch and connect the black wire #48615 to the blower switch terminal where the
yellow wire was located. Reconnect the yellow wire to one of the remaining terminals of
the black wire #48615 and connect the black/white wire from #48610 to the final remaining
terminal of the black wire #48615.
Radioisotope Hoods
115 Volt: Locate the black wire, which connects from the incoming AC power (in the
junction box) to the light switch. Disconnect this black wire from the light switch terminal
and connect to the solid black wire, which is part of wiring harness #48610. This black
wire will have two extra terminals attached – one of these terminals should be reconnected
to the light switch terminal. The other terminal should be connected to the unused blower
switch terminal located near the center of the blower switch. Next, connect the black/white
wire, which is a part of harness #48610 to the remaining blower switch terminal. The final
wiring step involves connecting the white wire in the wiring harness #48610 to the terminal
of the supplied white wire labeled #48616. After this is done, route the stripped end of this
white wire along with the yellow blower switch into the junction box following the same
path as the yellow blower wires. Tie this white wire inside the junction box to the other
white wires from the blower, lights, etc., using a wire nut.
Initial Adjustment/Set-up
Each alarm module and fume hood is unique and needs to be individually calibrated in the field.
The procedure for the adjustment is as follows:
1. Double check the installation to make sure that monitor and power supply are properly
installed.
2. Allow 10 minutes for the monitor to warm up once power has been connected.
3. Determine the low flow set point for your monitor. This is the value where the monitor
will first indicate a low flow condition. The red light will be on for this value. Refer to
your industrial hygiene officer for the proper low flow set point.
4. Adjust your fume hood airflow to the low flow set point as been previously determined.
5. Using a properly calibrated thermoanemometer, determine the velocity through the face of
the fume hood by taking a detailed velocity traverse. Divide the face area of the fume hood
into equal increments. One reading per square foot of face area is normally recommended
for an accurate traverse. Compute the average velocity for this area.
6. If the red light alarm is on, slowly turn the adjustment screw counterclockwise until the
green light is activated. If the green light is on, slowly turn the adjustment screw clockwise
until the red light comes on. Slowly turn the adjustment screw back counterclockwise until
the green light is activated. It is important that these adjustments be done in small