The wiring on the Daikin communication network, known as the D-III network, runs in a daisy chain configuration from the outdoor unit to the indoor fan coils on a heat pump system or to the branch selector boxes on a heat recovery system. Stranded wire has more surface area than a solid wire of the same gauge and provides for better communication. Since DC voltage runs on the outside of the conductor it is not recommended to run solid thermostat wire as the surface area is minimal and can cause communication errors as well. Having said that, if you do install shielded wire, one end of each section of the daisy chain must be grounded to the fan coil chassis. If we were to use shielded wire the shield would act as an antenna for transient voltage and can cause communication issues.
Daikin communication is a 16vdc communication circuit. I have heard various comments including “why no shield” to “why not 18-8 thermostat wire”. Daikin recommends a 16-18 gauge, stranded, non-shielded, two conductor wire. Today we will cover the Daikin control wiring basics including type of wire, system architecture, and basics of troubleshooting a communication error.įirst, let’s talk about the wiring. This is typically a simple problem to fix, but can be very time consuming to accomplish without the proper knowledge.
Over the course of the last few years I have seen an increase in the number of VRF jobs with communication errors.
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