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35
6 - STANDARD CONTROL OPERATIONS AND OPTIONS
This section points out the most significant control functionalities,
e.g. unit start/stop operation, heat/cool control. It also gives
instructions on how to perform critical operations of the main
control system.
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.
■
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.
6.2 - 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.
6.3 - Heating/Cooling selection
61XWHZE heat pumps can operate either in Cooling or Heating.
Heating/cooling selection can be controlled in various ways,
depending on the active operating type. By default, the cooling
mode is selected. Heating/cooling control can be automatic or
manual.
Heating/Cooling selection can be determined as follows:
■
locally at the unit in the GENUNIT menu,
■
remotely via the heating/cooling selection contact if the unit is
in the Remote operating type,
■
via a network command if the unit is in the Network operating type.
Parameter status
On/off
status
Control
type
Heat/Cool
selection in
Local
Heat/Cool
selection in
Remote
Heat/Cool
selection in
Network
Operating
mode
off
-
-
-
-
-
on
local
cooling
-
-
cooling
on
local
heating
-
-
heating
on
remote
-
on cooling
-
cooling
on
remote
-
on heating
-
heating
on
network
-
-
cooling
cooling
on
network
-
-
heating
heating
Active operating type
Parameter status
Result
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
Control
type
Unit
state
-
-
-
-
-
-
-
-
-
-
enable
-
-
off
-
-
-
-
-
-
-
-
-
-
-
yes
-
off
active
-
-
-
-
-
-
-
-
-
-
-
local
off
-
-
active
-
-
-
-
-
-
unoccupied
-
-
local
off
-
-
-
active
-
-
-
open
-
-
-
-
remote
off
-
-
-
active
-
-
-
-
-
unoccupied
-
-
remote
off
-
-
-
-
active
-
disable
-
-
-
-
-
network
off
-
-
-
-
active
-
-
-
-
unoccupied
-
-
network
off
-
-
-
-
-
active
-
-
local
unoccupied
-
-
local
off
-
-
-
-
-
active
-
open
remote
-
-
-
remote
off
-
-
-
-
-
active
-
-
remote
unoccupied
-
-
remote
off
-
-
-
-
-
active
disable
-
network
-
-
-
network
off
-
-
-
-
-
active
-
-
network
unoccupied
-
-
network
off
-
active
-
-
-
-
-
-
-
-
disable
no
local
on
-
-
active
-
-
-
-
-
-
occupied
disable
no
local
on
-
-
-
active
-
-
-
closed
-
occupied
disable
no
remote
on
-
-
-
-
active
-
enable
-
-
occupied
disable
no
network
on
-
-
-
-
-
active
-
-
local
occupied
disable
no
local
on
-
-
-
-
-
active
-
closed
remote
occupied
disable
no
remote
on
-
-
-
-
-
active
enable
-
network
occupied
disable
no
network
on
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.