Daikin MAGNITUDE WME-D, Installation Operation & Maintenance, Page: 40 / 56

OPERATION
MAGNITUDE WME-D MAGNETIC BEARING CHILLER DAIKIN APPLIED
40
Figure 50: Settings View - Commission
Table 17: Commission Setpoint Settings
Description Default Range PW Comments
Impeller
Type
Factory
set
096X T
Size of com-
pressor and
impeller type
IGV
Maximum
Position
100% 90 to 110% T
100% indicates
vanes are
straight
NOTICE
If both compressors have the same sequence number, they
will automatically balance starts and run-hours. User cannot
manually stage compressors as this is an internal process.
Figure 51: Settings View - Interface
Table 18: Unit Interface Settings
Descrip-
tion
De-
fault
Range PW Comments
BAS
Network
Protocol
NONE
NONE, MOD-
BUS, BACnet
IP, , BACnet
MS/TP
O
NONE: No BAS network
MODBUS: RTU - RS485
BACnet IP: IP - Ethernet
BACnet MS/TP: RS485
NOTICE
It is likely that the chiller will contain the factory settings for date
and time; therefore, it is important to verify or change these
settings when the chiller is first used on the jobsite. Failure to do
so will result in incorrectly labeled History files.
The version numbers shown towards the bottom left of the screen
are the controllers’ software identification. These numbers may
be required by Daikin Applied to answer questions about unit
operation or to assist in possible future upgrades of software.
Compressor Capacity Control
Compressor capacity is determined by the status of the leaving
chilled water temperature (LWT), which is a direct indicator
of whether the chiller is producing enough cooling to satisfy
the cooling load. The LWT is compared to the active chilled
water setpoint, and compressor loading or unloading ensues,
considering any capacity overrides that may be in effect.
Capacity Overrides
The conditions described in the following subparagraphs override
normal capacity control. Of the following limits, the one creating
the lowest capacity limit is in effect.
Low Evaporator Pressure
If the evaporator pressure approaches within 2 psi above the
Low Evaporator Pressure setpoint, the unit will inhibit capacity
increases. If the evaporator pressure approaches within 1 psi
above the Low Evaporator Pressure setpoint, the unit may unload
if chiller conditions necessitate it.
High Motor Temperature
If the highest motor stator temperature is above the limit, the unit
will adjust capacity to keep the temperature within the limits.
Demand Limit
The maximum amp draw of the compressor(s) can be limited
by a 4 to 20 mA signal on the Demand Limit analog input. This
function is only enabled if the Demand Limit Enable setpoint is
set to ON. The amp limit decreases linearly from the 100% Limit
(at 4 mA) to the Minimum Amp Limit setpoint (at 20 mA). While
this override is in effect, chiller capacity is continuously adjusted
to keep the % RLA near the requested demand limit.
Network Limit
The maximum amp draw of the compressor(s) can be limited by
a value sent through a BAS network connection and stored in
the Network Limit variable. While this override is in effect, chiller
capacity is continuously adjusted to keep the % RLA near the
requested demand limit.
Maximum Amp Limit
The maximum amp draw of the compressor(s) is always limited
by the Maximum Amps setpoint. This limit has priority over all
other functions including manual capacity control. While this
override is in effect, chiller capacity is continuously adjusted to
keep the % RLA near the limit value.