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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.
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/stop
Net
Mast
force
command
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
active
-
disable
active
-
-
-
active
-
-
active
-
-
active
-
-
active
disable
-
active
-
-
-
-
-
-
-
-
-
-
active
-
enable
-
active
-
-
active
-
-
active
enable
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
Heat/Cool
On/off
Control
selection in
status
type
Local
off
-
on
local
cooling
on
local
heating
on
remote
on
remote
on
network
on
network
Parameter status
Remote
Master
Start/stop
start/stop
control
time
contact
type
schedule
-
-
-
-
-
-
-
-
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
selection in
selection in
Remote
Network
-
-
-
-
-
on cooling
-
on heating
-
-
cooling
-
-
heating
Network
General
emergency
alarm
shutdown
-
enable
-
-
-
yes
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
disable
no
disable
no
disable
no
disable
no
disable
no
disable
no
disable
no
Operating
mode
-
-
-
cooling
-
heating
-
cooling
-
heating
cooling
heating
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
network
on
local
on
remote
on
network
on
35
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