Touch Pilot Control Operation; Start/Stop Control; Unit Stop Function - Carrier 30XA Operation Instructions Manual

7 - TOUCH PILOT CONTROL OPERATION

This.section.points.out.the.most.significant.control.functionalities,.
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
L-C
L-SC
rEM
Net.
MASt
• 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
LOFF L-C L-SC rEM
- - - -
- - - -
active - - -
- - active -
- - - active
- - - active
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- active - -
- - active -
- - - active
- - - -
- - - -
- - - -
- - - -
24
Local off
Local on
Local schedule
Remote
Network
Master unit
Parameters status
Start/stop Remote
Net. MASt force start/stop
command contact
- - - -
- - - -
- - - -
- - - -
- - - open
- - - -
active - disabled -
active - - -
- active - -
- active - open
- active - -
- active disabled -
- active - -
- - - -
- - - -
- - - closed
active - enabled -
- active - -
- active - closed
- active enabled -
It also gives instructions on how to perform critical operations
of the main control system.
• 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.
Master Start/stop time Network
control schedule emergency
type shutdown
- - enabled
- - -
- - -
- unoccupied -
- - -
- unoccupied -
- - -
- unoccupied -
local unoccupied -
remote - -
remote unoccupied -
network - -
network unoccupied -
- - disabled
- occupied disabled
- occupied disabled
- occupied disabled
local occupied disabled
remote occupied disabled
network occupied disabled
Control Unit
General
type state
alarm
- - off
yes - off
- local off
- local off
- remote off
- remote off
- network off
- network off
- local off
- remote off
- remote off
- network off
- network off
no local on
no local on
no remote on
no network on
no local on
no remote on
no network on