Standard Control Operations And Options; Unit Start/Stop Control - Carrier SmartVu control Manual

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 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 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.
Active operating type
LOFF L-C L-SC Rem
- - - -
- - - -
active - - -
- - active
- - - active
- - - active
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- active - -
- - active -
- - - active
- - - active
- - - active
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
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.
34
Start/stop
Net Mast force
command
- - -
- - -
- - -
- - -
- - -
- - -
active - disable
active - -
- active -
- active -
- active -
- active disable
- active -
- - -
- - -
- - -
- - -
- - -
active - enable
- active -
- active -
- active -
- active -
- active enable
■ 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.
Parameter status
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
Network
General
emergency
alarm
shutdown
- enable -
- - yes
- - -
- -
- - -
- -
- - -
- -
- -
- - -
- -
- - -
- -
- disable no
disable no
disable no
disable no
disable no
disable no
disable no
disable no
disable no
disable no
disable no
Result
Unit
Control
state
type
- off
- off
local off
local off
remote off
remote off
network off
network off
local off
remote off
remote off
network off
network off
local on
local on
remote on
remote on
remote on
network on
local on
remote on
remote on
remote on
network on