Carrier 30XW150-400 Touch Pilot Start/Stop Control, Active Operating Type Parameter Status, Ccn

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

Local

Local

Local

Remote

CCN

Master

CHIL_S_S

Remote

Master Unit

Start/Stop

CCN

General

CONTROL

UNIT

Start/Stop

Schedule

Emergency

TYPE

STATUS

On

On

Schedule

Mode

Mode

Mode

Variable

Control Type

Alarm

Contact

Mode

Shutdown

-

-

-

-

-

-

-

-

-

-

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

21