Daikin BRR9B1V1, Installation Manual

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7 | Electrical installation
Installation manual
17
BRR9B1V1
Communication box
4P617761-1 – 2020.04
7.2 Field wiring: Overview
Field wiring consists of:
▪ power supply (including earth),
▪ DIII transmission wiring between communication box and outdoor unit,
▪ RS‑485 transmission wiring between communication box and monitoring system.
NOTICE
▪
Be sure to keep the power line and transmission line apart from each other.
Transmission wiring and power supply wiring may cross, but may NOT run
parallel.
▪
In order to avoid any electrical interference the distance between both wirings
should ALWAYS be at least 50 mm.
Transmission wiring
7‒1 DIII weak current – Transmission wiring between each unit except monitoring system
Transmission wiring specification and limits
(a)
Vinyl cords with 0.75 to 1.25 mm² sheath or cables (2‑core wires)
Maximum wiring length 1000 m
Total wiring length ≤2000 m
(a)
If the total transmission wiring exceeds these limits, communication errors might occur.
7‒2 RS-485 weak current – Transmission wiring between monitoring system and communication
box
Transmission wiring specification and limits
(a)
Vinyl cords with 0.75 to 1.25 mm² sheath or cables (2‑core wires)
Maximum wiring length 1200 m
(a)
If the total transmission wiring exceeds these limits, communication errors might occur.
7.3 Guidelines when connecting the electrical wiring
Keep the following in mind:
▪ If stranded conductor wires are used, install a round crimp-style terminal on the
end of the wire. Place the round crimp-style terminal on the wire up to the
covered part and fasten the terminal with the appropriate tool.
b a
a Stranded conductor wire
b Round crimp-style terminal
▪ Use the following methods for installing wires: