3
IOM-UpGradeKit-SentryPlusAlert2
2013
EDP# 2916013
© 2020 Watts
1. Installing the Flood Sensor
(Backfl ow RPZ Upgrades)
The Flood Sensor is installed in the discharge piping from the
RPZ relief valve. If the Flood Sensor detects water in the dis-
charge piping, it will signal the Control Box to close the valve.
1. Identify a location to mount the Flood Sensor. It can be
installed in either a 2" female NPT joint of your choice, or the
2" NPT tee included with the kit.
2. When using the supplied tee, install the sensor in the RPZ
discharge line in the HORIZONTAL position. Install the Flood
Sensor into the tee by screwing it in, ensuring that the
probes point downward as shown below.
3. Unscrew the black cap to access the sensor probes. Push
the two metal probes down until they touch the bottom of
the pipe, then pull them up at least ¼". The ends of the
sensor probes should be located between ¼" and ½ of
the pipe’s inner diameter from the pipe bottom. The probes
MUST NOT BE
less than ¼" from the pipe wall. Hand
tighten the white plastic nuts on the probes to make it
water tight.
Ensure Flood Sensor probes do not contact pipe bottom or sides.
CAUTION
!
Installation and Operation
Flood Sensor
To Floor
Drain
From RPZ
Relief Valve
(with Air Gap)
Sensor Probes
Installed
4. If the sensor probes are too long, cut off the top of probes so
they fit properly when the cap is closed. To shorten the probe,
loosen and lower the terminal block located at the top of the
probe, then cut off the excess metal.
5. It's recommended that certified electrician should wire the sen-
sor to the Control Box, as described in the next section.
6. Place the cap back on.
NOTE:
Upon installation & Wiring, terminal blocks should not
touch.
Tighten
nuts
If necessary,
cut excess
off the top of
the probe
