Labconco Guardian Jr. Airflow Monitor 9743200 Series - Manual (Page 9)

INSTALLATION
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10. Insert the velocity probe into the open end of the vinyl tubing and position the probe in the
3/8" diameter hole drilled in Step 9. Place the end of the airflow hose with the nozzle
inside the hose near the exhaust duct as the nozzle helps regulate airflow properly.
RTV the probe in position to complete your installation.
11. Locate caution label directly above the alarm on the appropriate corner cover.
Electrical Connections
12. Note the separate green wire that is routed with the low voltage power supply lead wires
(gray colored cable) that come from the power supply module. Route the separate green
wire to the outlet box on the hood that powers the hood lighting fixtures. Route the green
wire noted above into the rear connector on this outlet box and connect to a secure earth
screw inside the outlet box. This green wire provides earth ground to the alarm module to
make it less susceptible to electrical noise created by the fluorescent lights.
13. Route the power supply module AC voltage lead wires (black and white wires) down
between the fume hood liner and outside wall to the back of the header panel. On standard
Protector Fume Hoods, run this wiring inside the header panel through the access hole
provided in the right side corner post. Remove the header panel cover plate to gain access
for specific wiring connections. Instructions for wiring connections for each style of hood
is as follows:
Protector Hoods
115 Volt: Locate the black wire, which connects from the incoming AC power (in the
junction box) to the hood light switch. Disconnect this black wire from the light switch
terminal and connect the solid black wire in 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 the white wire, which is part of #48610. Locate the white wire that
connects to the fluorescent lamps and find the point where it connects, via removable
terminals, to the white wire from the junction box. Disconnect the removable terminal and
use the white wire (part of #48610) to reconnect the white wires. The other attached white
wire provides a connection to the air monitor power supply module.
230 Volt: Locate the black wire, which is connected to the hood blower switch.
Disconnect this black wire from the blower switch terminal and connect to the blue wire of
#48611 using the attached terminal. Reconnect the remaining terminal of the blue wire
(part of #48611) to the original blower switch terminal. Locate the white wire on the
blower switch, which is adjacent to the blue wire just connected above. Disconnect this
white wire from the blower switch terminal and connect to the brown wire in wiring
harness #48611. Reconnect the remaining terminal on this brown wire to the blower
switch terminal where the white wire was originally removed.