Carrier SmartView - 6 - STANDARD CONTROL OPERATIONS AND OPTIONS; Unit Start;Stop Control Logic

6 - STANDARD CONTROL OPERATIONS AND OPTIONS
6.1 - 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 conguration, or alarms triggered due to operating
conditions.
The table given below summarises 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 off
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 Parameters 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
- - - - - - - - - - enabled - - off
- - - - - - - - - - - yes - off
active - - - - - - - - - - - local off
- - active - - - - - - unoccupied - - local off
- - - active - - - open - - - - remote off
- - - active - - - - - unoccupied - - remote off
- - - - active - disabled - - - - - network off
- - - - active - - - - unoccupied - - network off
- - - - - active - - local unoccupied - - local off
- - - - - active - open remote - - - remote off
- - - - - active - - remote unoccupied - - remote off
- - - - - active disabled - network - - - network off
- - - - - active - - network unoccupied - - network off
- active - - - - - - - - disabled no local on
- - active - - - - - - occupied disabled no local on
- - - active - - - closed - occupied disabled no remote on
- - - - active - enabled - - occupied disabled no network on
- - - - - active - - local occupied disabled no local on
- - - - - active - closed remote occupied disabled no remote on
- - - - - active enabled - network occupied disabled 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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