Pro-Dialog Plus Control Operation; Start/Stop Control; Heating/Cooling/Standby Operation - Carrier 30RQ Operation And Maintenance Instructions

5 - PRO-DIALOG PLUS CONTROL OPERATION

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.
• Remote start/stop contacts: these contacts are used
when the unit is in remote operating type (rEM). See
sections 3.6.2 and 3.6.3.
• CHIL_s_s: this network command relates to the chiller
start/stop when the unit is in CCN control (CCn).
Variable forced to disable: the unit is halted. Variable
forced to Enable: the unit runs in accordance with
schedule 1.
Active operating type
LOFF L-ON L-SC rEM
- - - -
- - - -
Active - - -
- - Active -
- - - Active
- - - Active
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- Active - -
- - Active -
- - - Active
- - - Active
- - - Active
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -

5.2 - Heating/cooling/standby operation

5.2.1 - General
The heating/cooling/standby selection applies to all units.
But only 30RB (liquid chillers) units, 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 configured by the user (see Setpoint menu
for cooling and heating mode changeover thresholds). If the
unit is in standby it does not cool or heat, and no compressor
can be activated. The diagram below summarises the
operating principle in automatic mode.
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Status of parameters
CCN MASt CHIL_S_S Remote
start/stop
contact
- - - -
- - - -
- - - -
- - - -
- - - Off
- - - -
Active - Disable -
Active - - -
- Active - -
- Active - Off
- Active - -
- Active Disable -
- Active - -
- - - -
- - - -
- - - On cooling
- - - On heating
- - - On auto
Active - Enable -
- Active - -
- Active - On cooling
- Active - On heating
- Active - On auto
- Active Enable -
• 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 arrange-
ment. The master control type determines whether the
unit is to be controlled locally, remotely or through
CCN (this parameter is a Service configuration).
• CCn emergency shutdown: if this CCN command is
activated, it shuts the unit down whatever the active
operating type.
• General alarm: the unit is totally stopped due to failure.
Master Start/stop CCN
control schedule emergency
type mode shutdown
- - Enable
- - -
- - -
- Unoccupied -
- - -
- Unoccupied -
- - -
- Unoccupied -
Local Unoccupied -
Remote - -
Remote Unoccupied -
CCN - -
CCN Unoccupied -
- - Disable
- Occupied Disable
- Occupied Disable
- Occupied Disable
- Occupied Disable
- Occupied Disable
Local Occupied Disable
Remote Occupied Disable
Remote Occupied Disable
Remote Occupied Disable
CCN Occupied Disable
HEATING STANDBY
Heating
threshold*
* This threshold does not apply to cooling only units that do not control a boiler.
Control Unit
type mode
General
alarm
- - Off
Yes - Off
- Local Off
- Local Off
- Remote Off
- Remote Off
- CCN Off
- CCN Off
- Local Off
- Remote Off
- Remote Off
- CCN Off
- CCN Off
No Local On
No Local On
No Remote On
No Remote On
No Remote On
No CCN On
No Local On
No Remote On
No Remote On
No Remote On
No CCN On
COOLING
Outdoor
temperature
Cooling
threshold