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View Full Version : Daikin Piping Layout Confirmation and BS Box Count


R.J.
30-01-2021, 06:28 AM
Unit is a RWEYQ72PCTJ with three AHUs and one BS Box. This was my first commission with a heat recovery Daikin and received a UF error. I suspect the system may be piped incorrectly and attached some layout diagrams. Anyone confirm?

Also, I was able to count the number of AHUs and 3 were confirmed via the LEDs. When I entered the mode to count the BS Box, the LEDs showed 3 boxes when only one is installed. Very odd as HP7 should only be illuminated. Bug perhaps?
frank
30-01-2021, 01:27 PM
Error UF comes up as Indoor Unit failed to get address from Outdoor Unit.

Sounds like a wiring issue rather than a piping issue.
R.J.
31-01-2021, 04:42 AM
When all of the equipment is turned on, Daikin finishes the addressing procedure when the HP2 LED goes out, right? I was able to initiate the first test run but it obviously failed.
frank
31-01-2021, 12:30 PM
If the outdoor unit cannot 'handshake' the indoor unit then that is due to a lack of communication. This could be caused by a lack of power supply to the indoor unit, a fault in the F1 F2 wiring or failed indoor pcb.

A piping error would show up when the initial 'Test' run is carried out.

The initial addressing proceedure will only address indoor units the outdoor can 'see'.