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Table 14 summarizes the unit control type and stop or go
status with regard to the following parameters:
• Operating type: this is selected by 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 (Remote mode).
• CHIL_S_S: this network command variable relates to the
chiller start/stop when the unit is in CCN control (CCN
mode). When this variable forced to Disable, then the unit is
stopped. When this variable is forced to Enable, then 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 (Sched-
ule 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 CCN (this parameter
is a Service configuration).
• CCN emergency shutdown: if this CCN command is acti-
vated, it shuts the unit down whatever the active operating
type.
• General alarm: the unit is totally stopped due to failure.
Local Mode
— To start the machine in local mode, press the
Start/Stop button on the Touch Pilot display. The Equipment
Start screen will be displayed. Select Local On. The control
will ignore the position of Enable/Off/Remote Contact switch
and all CCN network force commands, except an Emergency
Stop Command. The Run Status variable, indicating the cur-
rent status of the machine, will change to RUNNING, DELAY
or READY. The Chiller Occupied? variable will change to
YES. The Control Type variable indicates the type of control.
For this configuration, Control Type will be Local. The Oper-
ating Type variable will change to L-On (Local On).
Local Schedule
— To start the machine with a local schedule,
press the Start/Stop button on the Touch Pilot display. The
Equipment Start screen will be displayed. Select Local Sched-
ule. The unit will start and stop according to the schedule de-
fined in the Time Schedule menu. Two Internal Time Sched-
ules are available and must be field programmed. Time
Schedule 1 is used for single set point On-Off control. Time
Schedule 2 is used for Dual Set Point/Occupied-Unoccu-
pied set point control. The control will ignore the position of
Enable/Off/Remote Contact switch and all CCN network force
commands, except the Emergency Stop Command.
The Run Status variable will indicate the current status of
the machine — OFF, RUNNING, DELAY, or READY. The
Chiller Occupied? variable will indicate the occupied state of
the machine according to Time Schedule 1 and will be either
YES (occupied) or NO (unoccupied). The Control Type vari-
able will indicate the type of control. For this configuration,
Control Type will be Local. The Operating Type variable
will change to L-Sched (Local Schedule).
The schedules consist of 8 user-configurable occupied time
periods. The control supports time schedules for local control,
remote control, and ice building. These time periods can be
flagged to be in effect or not in effect on each day of the week.
The day begins at 00.00 and ends at 24.00. The machine will be
in unoccupied mode unless a scheduled time period is in effect.
If an occupied period extends past midnight, the occupied
period will automatically end at 24:00 hours (midnight) and the
new occupied period must be programmed to begin at 00:00
hours.
In the following example, the occupied period starts at 6:00
AM, Monday through Friday and 10:00 AM on Saturday and
Sunday. The occupied time ends at 6:30 PM on Monday
through Friday and 2:00 PM on Saturday and Sunday. See
Fig. 16.
NOTE: This schedule was designed to illustrate the program-
ming of the schedule function and is not intended as a
recommended schedule for chiller operation.
If the chiller is to be controlled to a single set point, use
Schedule 1 (OCCPC01S). This will start and stop the machine.
During the unoccupied times, the chiller will be off. If the chill-
er is to be controlled to 2 set points, occupied and unoccupied,
use Schedule 2 (OCCPC02S). This will cause the chiller to
control to an occupied set point and an unoccupied set point.
The machine will be able to provide cooling at any time.
To configure this option on the Touch Pilot™ display see
Table 15.
Table 14 — Touch Pilot™ Start/Stop Control
ACTIVE OPERATING TYPE PARAMETER STATUS
CONTROL
TYPE
UNIT
STATUS
Local
On
Local
On
Local
Schedule
Remote
Mode
CCN
Mode
Master
Mode
CHIL_S_S
Variable
Remote
Start/Stop
Contact
Master Unit
Control Type
Start/Stop
Schedule
Mode
CCN
Emergency
Shutdown
General
Alarm
-- - - - - - - - - Active - - Off
-- - - - - - - - - - Yes - Off
Active - - - - - - - - - - - Local Off
- - Active - - - - - - Unoccupied - - Local Off
- - - Active - - - Off - - - - Remote Off
- - - Active - - - - - Unoccupied - - Remote Off
- - - - Active - Off - - - - - CCN Off
- - - - Active - - - - - - - CCN Off
- - - - - Active - - Local Unoccupied - - Local Off
- - - - - Active - Off Remote - - - Remote Off
- - - - - Active - - Remote Unoccupied - - Remote Off
- - - - - Active Off - CCN - - - CCN Off
- - - - - Active - - CCN Unoccupied - - CCN Off
- Active - - - - - - - - Disabled No Local On
- - Active - - - - - - Occupied Disabled No Local On
- - - Active - - - On Cool - Occupied Disabled No Remote On
- - - - Active - On - - Occupied Disabled No CCN On
- - - - - Active - - Local Occupied Disabled No Local On
- - - - - Active - On Cool Remote Occupied Disabled No Remote On
- - - - - Active On - CCN Occupied Disabled No CCN On