24
TOUCH PILOT CONTROL OPERATION
e.g. unit start/stop operation, heat/cool control.
7.1 - Start/Stop control
The unit state is determined based on a number of factors,
including its operating type, active overrides, open contacts,
master/slave configuration, or alarms triggered due to
operating conditions.
The table given below summarises the unit control type and
its running status with regard to the following parameters:
• Operating type: 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: Chiller start/stop force
command can be used to control the chiller state in
the Network operating type.
- Command set to stop: The unit is halted.
- Command set to start: The unit runs in
accordance with schedule 1.
Active operating type Parameters status
Control
type
Unit
state
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
- - - - - - - - - - enabled - - o
- - - - - - - - - - - yes - o
active - - - - - - - - - - - local o
- - active - - - - - - unoccupied - - local o
- - - active - - - open - - - - remote o
- - - active - - - - - unoccupied - - remote o
- - - - active - disabled - - - - - network o
- - - - active -
- - - unoccupied - - network o
- - - - - active - - local unoccupied - - local o
- - - - - active - open remote - - - remote o
- - - - - active - - remote unoccupied - - remote o
- - - - - active disabled - network - - - network o
- - - - - active - - network unoccupied - - network o
- 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
• Remote start/stop contact status: Start/stop contact
can be used to control the chiller state in the Remote
operating type.
• Master control type: When the unit is the master unit
in a two-chiller lead/lag arrangement, the master unit
may be set to be controlled locally, remotely or via
network (see also 7.15).
• Start/stop time schedule: Occupied or unoccupied
status of the unit.
• Network emergency stop command: If activated, the
unit shuts down regardless of the active operating
type.
• General alarm: The unit shuts down due to failure.
7.2 - Unit stop function
This function controls the unit compressor capacity reduction.
If there is an alarm or a demand to stop, it forces the
compressors to the minimum capacity before stopping them.
It also gives instructions on how to perform critical operations
of the main control system.
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