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Set Up the Valve
The freeze sensor shown here is installed on a Watts 800M4 PVB. The installation steps are the same for any Watts valve that
has a freeze sensor.
1. For retrofit installation only. Snap the mounting clip with
freeze sensor over one of the test cocks.
2. Remove the insulation from the freeze sensor leads.
3. Use the wire stripper to cut ½" insulation off both ends
of the 2-conductor cable connecting the sensor to the
activation module.
Connect Wiring to the Activation Module
1. Use a #2 Phillips screwdriver to remove the cover of
activation module.
2. Unscrew the 2-part vent and install the larger piece into
the exterior side of the hole in the module housing, then
attach the nut to the vent thread on the interior side.
3. Thread the sensor cable from the valve through the
gland and insert one wire into the NTC+ terminal and
the other wire into the NTC– terminal.
4. Thread the power adapter cable through the gland then
connect the positive wire (black with white stripes) to
the 5V IN spring terminal and the ground wire (all black)
to the 0V IN spring terminal.
5. Use the wire stripper to cut ½" insulation off both ends
of the conductor cable connecting the activation module
to the building or irrigation management system. (If
using both relay terminals, prepare two 2-conductor
cables or one 4-conductor cable.)
SYSTEM CABLE Connect at least one RLY
terminal to the BMS/IMS input. Each relay has
a fixed threshold: RLY1, 37°F; RLY2, 32°F.
To activate a relay terminal, connect one wire to
the COM terminal and the other wire to either
the NO terminal or the NC terminal.
4. Connect the freeze sensor leads to one end of the cable
using the weather-proof wire nuts provided.
5. Use the tie to strap the first segment of the cable to
the valve.
6. Thread one end of the system cable through the gland
to connect the RLY1 terminal for threshold 37°F or the
RLY2 terminal for threshold 32°F.
Open the levers of the selected terminal and connect one
wire to the COM terminal and the other wire to either the
NO (normally open) or the NC (normally closed) terminal,
depending on the controller specification.
Clamp the levers to secure the wires. (If using both relay
terminals, repeat this step to connect the other terminal.)
7. Follow the manufacturer's instructions to connect the
other end of the cable to the building or irrigation
management system.
8. Plug the power adapter into a 120VAC, 60Hz,
GFI-protected electrical outlet.
SENSOR CABLE Connect one
wire to the NTC+ terminal and the
other wire to the NTC– terminal.
3
POWER ADAPTER Connect the wires
to the voltage IN spring terminals.
Connect the positive wire to 5V and
the ground wire to 0V.
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