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MODEL WMC CHILLERS
18 www.DaikinApplied.com
Communication Setup for
Multiple Chillers
On multi-chiller Model WMC applications, up to four Model
WMC chillers can be LAN interconnected by field RS485
interconnecting wiring (refer to Lines 165-174 on
“Figure 12:
Wiring Index”
) with the addition of an accessory communication
isolation board between each chiller connected. (The total
number of isolation boards needed is one less than the number
of chillers connected.) The isolation board can be purchased
with the unit or separately, during or after chiller installation.
N-1 boards are required.
In order for interconnection to function properly, some of the
chiller control settings will need to be modified. Interconnection
between chillers should be made at startup by the
McQuay International technician.
NOTE:
Chillers connected via pLAN MUST share the same
software revision. WMC B and C vintage chillers are
compatible for interconnection via pLAN. If trying to
connect WMC A vintage chillers to eachother or to B
or C vintage chillers, consult a McQuay International
service representative. WMC chillers cannot be
pLAN interconnected with WSC, WDC, WCC or WME
centrifugal chillers.
Long Term Storage
This information applies to new units being stored waiting
for startup or to existing units that may be inoperative for an
extended period of time.
The chiller must be stored in a dry location indoors and
protected from any damage or sources of corrosion. A
McQuay International service representative must perform
an inspection and leak test of the unit on minimum quarterly
schedule, to be paid by the owner or contractor. Daikin
Applied will not be responsible for any refrigerant loss during
the storage time or for repairs to the unit during the period of
storage, or while moving the unit from the original location to
a storage facility and back to any new installation location. If
there is concern about the possibilities of damage and loss
of charge during storage, the customer can have the charge
removed and stored in recovery cylinders.
CAUTION
If the temperature of where the chiller is located is expected to
exceed 104°C (40°C), then the refrigerant must be removed.
For additional tasks required, contact McQuay International
service.
