Standard Control Operations And Options; Start/Stop Control; Cooling / Heating; Control Interlock Contact - Carrier Touch Pilot Control Series Control Manual

8 - STANDARD CONTROL OPERATIONS AND OPTIONS

8.1 - 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.
The table given below summarizes the unit control type [ctrl_typ]
and its running status with regard to the following parameters:
■ Operating type: This operation 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]: 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 according to 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
LOFF L-C L-Sc Rem
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.
Start/
Remote start/
Net Mast Stop force
stop contact
command
active disable
active
active
active
active
active disable
active
active enable
active
active
active enable

8.2 - Cooling / Heating

The table below summarises the unit operation based on the
following parameters:
■ Unit On/Off status: This parameter indicates whether the unit
is shut down (not authorised to start) or in operation (authorised
to start).
■ Control type: Indicates whether the unit operates in Local,
Remote or Network mode.
■ Heating/Cooling selection in Local mode: The operating mode
is selected via the user interface (GENUNIT menu).
■ Heat/Cool switch status in Remote mode: This contact is active
only when the unit is under remote control.
■ Heat/Cool selection in Network mode: The network command
[HC_SEL] permits heating/cooling control if the unit is in
Network operating mode.
Control Heat/Cool
Status
type
Off -
On local
On local
On remote
On remote
On network
On network

8.3 - Control interlock contact

This contact checks the status of a loop (customer safety loop).
It prevents the unit from starting if it is open when the delay at
start-up has expired. This open contact leads to an alarm shut-
down, if the unit is running (alarm 10014).
Parameters' status
Master
Start/Stop
control
schedule
type
unoccupied
open
unoccupied
unoccupied
local unoccupied
open remote
remote unoccupied
network
network unoccupied
occupied
closed occupied
occupied
local occupied
closed remote occupied
network occupied
Heat/Cool Heat/Cool
in Local in Remote in Network
- - -
cool - -
heat - -
- on_cool -
- on_heat -
- - cool
- - heat
Network
Alarm
Emergency
shutdown
Shutdown
enable
yes
disable no
disable no
disable no
disable no
disable no
disable no
disable no
Current unit
operating
mode
-
cooling
heating
cooling
heating
cooling
heating
Control Unit
type state
off
off
off
local
local off
off
remote
off
remote
off
network
off
network
off
local
off
remote
off
remote
off
network
off
network
on
local
on
local
on
remote
on
network
on
local
on
remote
on
network
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