Carrier AquaForce 61XWHZE, Control Manual

Page: 35 / 52

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.