Standard Control Operations And Options; Unit Start/Stop Control - Carrier Touch Pilot Junior Manual

8 - STANDARD CONTROL OPERATIONS AND OPTIONS

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 configuration, 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
L-C
L-SC
Rem
Net
Mast
Active operating type
LOFF L-C L-SC
- - -
- - -
active
active
active
active
IMPORTANT: When the unit is stopping or there is a
demand to stop the unit, compressors are stopped
consecutively.
24
Local off
Local on
Local schedule
Remote
Network
Master unit
Parameter status
Rem Net Mast Start/stop
force
command
- - - -
- - - -
-
-
active -
active -
active disable
active -
active -
active -
active -
active disable
active -
-
-
active -
active -
active -
active enable
active -
active -
active -
active -
active enable
• 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.
Remote Master Start/stop
start/stop control time
contact type schedule
- - -
- - -
- - -
- - unoccupied
off
- -
- - unoccupied
- - -
- - unoccupied
- local unoccupied
off
remote -
- remote unoccupied
- network -
- network unoccupied
- - -
- - occupied
on_cool - occupied
on_heat - occupied
on_auto - occupied
- - occupied
- local occupied
on_cool remote occupied
on_heat remote occupied
on_auto remote occupied
- network occupied
In case of emergency stop, all compressors are stopped at
the same time.
Result
Network General Control
emergency alarm type
shutdown
enable - -
- yes -
- - local
- - local
- - remote
- - remote
- - network
- - network
- - local
- - remote
- - remote
- - network
- - network
disable no local
disable no local
disable no remote
disable no remote
disable no remote
disable no network
disable no local
disable no remote
disable no remote
disable no remote
disable no network
Unit
state
off
off
off
off
off
off
off
off
off
off
off
off
off
on
on
on
on
on
on
on
on
on
on
on