Installation manual

IM 1029-2 Magnitude™ Frictionless Centrifugal Chillers – Model WMC 45
Multiple Chiller Setup
WMC units have their control components factory wired to an internal network (LAN) so that the components
can communicate with each other, within the chiller itself.
On multi-chiller Model WMC applications, up to four Model WMC chillers can be LAN interconnected by
field RS485 interconnecting wiring, with the addition of an accessory communication isolation board(s)
485OPDR (Daikin P/N 330276202) between each chiller (one less than the number of chillers connected), and
some MicroTech II control settings. The 485OPDR isolation board can be purchased with the unit or
separately, during or after chiller installation. N-1 boards are required. WMC chillers canno
t be LAN
interconnected with WSC, WDC, WCC or WME centrifug
al chillers. Interconnection should be made at startup
by the Daikin technician.
!
IMPORTANT NOTE
Chillers connected via pLAN connections MUST share the same software revision. WMC A-vintage models
may not be LAN interconnected to WMC B-vintage models. WMC chillers cannot be LAN interconnected with
WSC, WDC, WCC or WME centrifugal chillers.
Communication Setup
Figure 28, Communication Wiring
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