Installation Guide

Switch Definitions
NO: Connected to a Normally Opened Circuit
NC: Connected to a Normally Closed Circuit
24V: Connected to a 24V Circuit
: Connected to a
non-powered circuit.
Pre-installation checklist
Installing the Dry Contact Sensor
❶ Before you begin, turn off power to the equipment
we are monitoring.
❷ Identify the type of float switch for the HVAC unit
in the “Wiring Diagrams” section.
Wiring diagrams
Monitoring the R-wire with float switches
wired between the HVAC control board and
the thermostat
❶ Turn off power to the HVAC unit.
❷ Install or locate the existing float switches.
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