Table 7. Chiller Unit Controller Setup Variables - McQuay MicroTech II Operation Manual

Table 7. Chiller Unit Controller Setup Variables

Chiller Controller Variable
Protocol
Source
Mode
Start Delta
Max Pull Down
Soft Load
Evap Pump Recirculate Timer
(MTII Centrifugal Chillers)
During the network commissioning process, set the chiller unit controller's SOURCE variable to "Switches" to disable
the chiller. If the network is being commissioned before a particular chiller has been commissioned, that chiller's
SOURCE must be set to "Switches" to prevent it from starting.
OM 780-2
Value Description
Lon The CSM communicates with MTII chillers through the chiller's L
communication module
Network The chiller must allow the L
Cool (not Ice or Cool/Ice) The CSM does not support the Heat, Ice or Cool/Ice modes
1°F (0.6°C) Reduce the temp difference required for starting in this multiple chiller system
2°F (1.1°C)
Off Soft Load control is supplied through the CSM
0.5 min (this is the default) A compressor must transition from Off to Starting within 3 minutes after being
enabled or the CSM will consider it off-line
CAUTION
W network control
ON ORKS
W
ON ORKS
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