CIAT PRO-DIALOG+ - Pro-Dialog+ Control Operation; Start;Stop Control Methods; Heating, Cooling, and Standby Operation; Heat Exchanger Water Pump Control

5.1 - Start/stop control
The table below summarises the unit control type and stop or
go status with regard to the following parameters.
• Operating type: this is selected using the start/stop button
on the front of the user interface.
LOFF: local off, L-C: local on, L-SC: local schedule, REM:
remote, Net.: network, MAST: Master
• Remote start/stop contacts: these contacts are used
when the unit is in remote operating type (Remote). See
sections 3.6.2 and 3.6.3.
• CHIL_S_S: this network command relates to the unit
start/stop when the unit is in network mode.
• Command set to Stop: the unit is halted.
• Command set to Start: the unit runs in accordance with
schedule 1.
• Start/Stop schedule: occupied or unoccupied status of
the unit as determined by the chiller start/stop program
(Schedule 1).
• Master control type. This parameter is used when the unit
is the master unit in a two chiller lead/lag arrangement.
The master control type determines whether the unit is to
be controlled locally, remotely or through Network (this
parameter is a Service conguration).
• Network emergency shutdown: if this network command
is activated, it shuts the unit down whatever the active
operating type.
• General alarm: the unit is totally stopped due to failure.
5.2 - Heating/cooling/standby operation
5.2.1 - General
The heating / cooling / standby selection applies to all units. But
only liquid chillers, controlling a boiler can change over to heating
mode. Heating/cooling control can be automatic or manual.
In automatic mode the outdoor temperature determines the
heating/cooling/standby changeover based on the two threshold
values congured by the user (see RESETCFG menu for cooling
and heating mode changeover thresholds).
If the unit is in standby it does not cool or heat, and no com
-
pressor can be activated. The diagram below summarises the
operating principle in automatic mode.
HEATING STANDBY COOLING
Outdoor
temperature
Heating
threshold*
Cooling
threshold
* This threshold does not apply to cooling only units that do not control a
boiler.
ACTIVE OPERATING TYPE STATUS OF PARAMETERS CONTROL
TYPE
UNIT
MODE
LOFF L-ON L-SC rEM Net. MASt CHIL_S_S REMOTE
START/
STOP
CONTACT
MASTER
CONTROL
TYPE
START/STOP
SCHEDULE
MODE
NETWORK
EMERGENCY
SHUTDOWN
GENERAL
ALARM
- - - - - - - - - - Enable - - Off
- - - - - - - - - - - Yes - Off
Active - - - - - - - - - - - Local Off
- - Active - - - - - - Unoccupied - - Local Off
- - - Active - - - Off - - - - Remote Off
- - - Active - - - - - Unoccupied - - Remote Off
- - - - Active - Disable - - - - - Network Off
- - - - Active - - - - Unoccupied - - Network Off
- - - - - Active - - Local Unoccupied - - Local Off
- - - - - Active - Off 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 - - - On cooling - Occupied Disable No Remote On
- - - Active - - - On heating - Occupied Disable No Remote On
- - - Active - - - On auto - Occupied Disable No Remote On
- - - - Active - Enable - - Occupied Disable No Network On
- - - - - Active - - Local Occupied Disable No Local On
- - - - - Active - On cooling Remote Occupied Disable No Remote On
- - - - - Active - On heating Remote Occupied Disable No Remote On
- - - - - Active - On auto Remote Occupied Disable No Remote On
- - - - - Active Enable - Network Occupied Disable No Network On
5 - PRO-DIALOG+ CONTROL OPERATION
EN - 17 EREBA ACCESS