Connect Water Float Switches to Vertex Ducted Central Split (DYC-18) SystemsUpdated 11 days ago

Introduction

This article explains how to connect a water float switch to Vertex Ducted Central Split (DYC-18) systems. 

Water float switches are critical safety devices that prevent water damage by automatically shutting down the air conditioner if the condensate drain line becomes clogged and the overflow pan fills up. 

RS-485 Communication Mode

The indoor and outdoor units connect to three communication lines, P, Q, and E. Connect the water float switch between the Terminal P communication line. The Terminal P communication line of the indoor unit first passes through the water float switch, then to the Terminal P of the outdoor unit. 

24V Communication Mode

The indoor and outdoor units connect with R/C/Y/B/G via the 24V thermostat. The R terminal is a 24V power supply. Connect the water float switch to the R signal between the thermostat and indoor unit. When the water float switch experiences an overcurrent, it will disconnect the 24V power supply (R) and compressor signal (Y). This causes the compressor to stop operating.