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8.1 - Unit start/stop control
The unit state is determined based on a number of factors,
including its operating type, active overrides, open
contacts, master/slave conguration, or alarms triggered
due to operating conditions.
The table given below summarizes the unit control type
[ctrl_typ] and its running status with regard to the
following parameters:
• Operating type: This operating type is selected using
the Start/Stop button on the user interface.
LOFF Local o
L-C Local on
L-SC Local schedule
Rem Remote
Net Network
Mast Master unit
• Start/stop force command [CHIL_S_S]: Chiller start/
stop force command can be used to control the chiller
state in the Network mode.
- Command set to stop: The unit is halted.
- Command set to start: The unit runs in
accordance with schedule 1.
• Remote start/stop contact status [Onoff_sw]: Start/
stop contact status can be used to control the chiller
state in the Remote operating type.
• Master control type [ms_ctrl]: When the unit is the
master unit in a two-chiller master/slave arrangement,
the master unit may be set to be controlled locally,
remotely or via network.
• Start/stop schedule [chil_occ]: Occupied or
unoccupied status of the unit.
• Network emergency stop command [EMSTOP]: If
activated, the unit shuts down regardless of the active
operating type.
• General alarm: The unit shuts down due to failure.
Active operating type Parameter status Result
LOFF L-C L-SC Rem Net Mast Start/stop
force
command
Remote
start/stop
contact
Master
control
type
Start/stop
time
schedule
Network
emergency
shutdown
General
alarm
Control
type
Unit
state
- - - - - - - - - - enable - - o
- - - - - - - - - - - yes - o
active - - - - - - local o
active - - - unoccupied - - local o
active - o - - - - remote o
active - - - unoccupied - - remote o
active disable - - - - - network o
active - - - unoccupied - - network o
active - - local unoccupied - - local o
active - o remote - - - remote o
active - -
remote unoccupied - - remote o
active disable - network - - - network o
active - - network unoccupied - - network o
active - - - - disable no local on
active - - - occupied disable no local on
active - on_cool - occupied disable no remote on
active - on_heat - occupied disable no remote on
active - on_auto - occupied disable no remote on
active enable - - occupied disable no network on
active - - local occupied disable no local on
active - on_cool remote occupied disable no remote on
active - on_heat remote occupied disable no remote on
active - on_auto remote occupied disable no remote on
active enable - network occupied disable no network on
IMPORTANT: When the unit is stopping or there is a
demand to stop the unit, compressors are stopped
consecutively.
In case of emergency stop, all compressors are stopped at
the same time.
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