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TERMINATION OF ICE BUILD — The ice build function

terminates under the following conditions:

1. Time Schedule — When the current time on the ice build

time schedule (OCCPC02S) is not set as an ice build time

period.

2. Entering Chilled Water Temperature — Ice build opera-

tion terminates, based on temperature, if the ICE BUILD

TERMINATION parameter is set to 0 (TEMP), the

ENTERING CHILLED WATER temperature is less

than the ICE BUILD SETPOINT, and the ICE BUILD

RECYCLE is set to DSABLE. If the ICE BUILD

RECYCLE OPTION is set to ENABLE, a recycle

shutdown occurs and recycle start-up depends on

the LEAVING CHILLED WATER temperature being

greater than the water/brine CONTROL POINT plus the

RESTART DELTA T temperature.

3. Remote Contacts/Ice Level Input — Ice build operation

terminates when the ICE BUILD TERMINATION param-

eter is set to 1 (CONTACTS) and the ICE BUILD

CONTACTS are open and the ICE BUILD RECYCLE is

set to DSABLE (0). In this case, the ICE BUILD

CONTACTS provide ice level termination control. The

contacts are used to stop the ice build function when a

time period on the ice build schedule (OCCPC02S) is set

for ice build operation. The remote contacts can still be

opened and closed to start and stop the chiller when a

specific time period on the ice build schedule is not set for

ice build.

4. Entering Chilled Water Temperature and ICE BUILD

Contacts — Ice Build operation terminates when the ICE

BUILD TERMINATION parameter is set to 2 (BOTH)

and the conditions described above in items 2 and 3 for

ENTERING CHILLED WATER temperature and ICE

BUILD CONTACTS have occurred.

NOTE: It is not possible to override the CHILLER START/

STOP, CONTROL POINT, and ACTIVE DEMAND LIMIT

variables from CCN devices (with a priority 4 or greater)

during the ice build period. However, a CCN device can

override these settings during 2-chiller lead/lag operation.

RETURN TO NON-ICE BUILD OPERATIONS — The ice

build function forces the chiller to start, even if all other sched-

ules indicate that the chiller should stop. When the ice build

function terminates, the chiller returns to normal temperature

control and start/stop schedule operation. The CHILLER START/

STOP and CONTROL POINT return to normal operation. If the

CHILLER START/STOP or CONTROL POINT has been forced

(with a device of less than 4 priority) before the ice build func-

tion started, when the ice build function ends, the previous forces

(of less than 4 priority) are not automatically restored.

Attach to Network Device Control — The Service

menu includes the ATTACH TO NETWORK DEVICE

screen. From this screen, the operator can:

• enter the time schedule number (if changed) for

OCCPC03S, as defined in the NET_OPT screen

• attach the ICVC to any CCN device, if the chiller has been

connected to a CCN network. This may include other PIC-

controlled chillers.

• upgrade software

Figure 25 shows the ATTACH TO NETWORK DEVICE

screen. The LOCAL parameter is always the ICVC module

address of the chiller on which it is mounted. Whenever the

controller identification of the ICVC changes, the change is

reflected automatically in the BUS and ADDRESS columns

for the local device. See Fig. 17. Default address for local

device is BUS 0 ADDRESS 1.

When the ATTACH TO NETWORK DEVICE screen is

accessed, information can not be read from the ICVC on any

device until one of the devices listed on that screen is attached.

The ICVC erases information about the module to which it was

attached to make room for information on another device.

Therefore, a CCN module must be attached when this screen is

entered.

To attach any CCN device, highlight it using the

softkey and press the softkey. The message

“UPLOADING TABLES, PLEASE WAIT” displays. The

ICVC then uploads the highlighted device or module. If

the module address cannot be found, the message “COMMU-

NICATION FAILURE” appears. The ICVC then reverts back

to the ATTACH TO DEVICE screen. Try another device or

check the address of the device that would not attach. The

upload process time for each CCN module is different. In

general, the uploading process takes 1 to 2 minutes. Before

leaving the ATTACH TO NETWORK DEVICE screen, select

the LOCAL device. Otherwise, the ICVC will be unable to

display information on the local chiller.

ATTACHING TO OTHER CCN MODULES — If the chill-

er ICVC has been connected by CCN wiring to the CCN net-

work or other PIC controlled chillers, the ICVC can be used to

view or change parameters on the other controllers. Other PIC

III chillers can be viewed and set points changed (if the other

unit is in CCN control), if desired, from this particular ICVC

module.

If the module number is not valid, the “COMMUNICA-

TION FAILURE” message will show and a new address

number must be entered or the wiring checked. If the module is

communicating properly, the “UPLOAD IN PROGRESS”

message will flash and the new module can now be viewed.

Whenever there is a question regarding which module on

the ICVC is currently being shown, check the device name

descriptor on the upper left hand corner of the ICVC screen.

See Fig. 25.

When the CCN device has been viewed, the ATTACH TO

NETWORK DEVICE table should be used to attach to the PIC

that is on the chiller. Move to the ATTACH TO NETWORK

DEVICE table (LOCAL should be highlighted) and press the

softkey to upload the LOCAL device. The ICVC

for the 19XRV will be uploaded and default screen will display.

NOTE: The ICVC will not automatically reattach to the local

module on the chiller. Press the softkey to attach to

the LOCAL device and view the chiller operation.

SELECT

AT TA C H

Fig. 25 — Example of Attach to Network

Device Screen

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Carrier XRV Specifiche Pagina 55

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