Control Transformers (T1-T4); Control And Oil Heater Voltage; Lid Operation And Menus; General - Carrier 19EF Series Start Up & Operation Manual

CONTROL TRANSFORMERS (T1-T4) — These trans-
formers convert incoming control voltage to 21 vac power
for the PSIO module and options modules, or 24 vac power
for 3 power panel contactor relays, and 3 control solenoid
valves. They are located in the power panel.
CONTROLAND OIL HEATER VOLTAGE SELECTOR (S1)
— It is possible to use 115 v incoming control power in the
power panel. The switch is set to the voltage used at the
jobsite.
LID Operation and Menus (Fig. 10-16)

GENERAL

• The LID display will automatically revert to the default
screen after 15 minutes if no softkey activity takes place
and if the machine is not in the Pumpdown mode
(Fig. 10).
• When not in the default screen, the upper right-hand cor-
ner of the LID always displays the name of the screen that
you have entered (Fig. 11).
• The LID may be configured in English or SI units, through
the LID configuration screen.
• Local Operation — By pressing the LOCAL softkey, the
PIC is now in the LOCAL operation mode and the control
will accept modification to programming from the LID only.
The PIC will use the Local Time Schedule to determine
machine start and stop times.
• CCN Operation — By pressing the CCN softkey, the
PIC is now in the CCN operation mode, and the control
will accept modifications from any CCN interface or mod-
ule (with the proper authority), as well as the LID. The
PIC will use the CCN time schedule to determine start and
stop times.
ALARMS AND ALERTS — Alarm (*) and alert (!) status
are indicated on the Default screen and the Status tables. An
alarm (*) will shut down the compressor. An alert (!) notifies
the operator that an unusual condition has occurred. The ma-
chine will continue to operate when an alert is shown.
Alarms are indicated when the control center alarm light
(!) flashes. The primary alarm message is viewed on the de-
fault screen and an additional, secondary, message and
troubleshooting information are sent to the Alarm History
table.
PRIMARY STATUS
MESSAGE
SECONDARY
STATUS
MESSAGE
ALARM LIGHT
(ILLUMINATED
WHEN POWER ON)
•
BLINKS CONTINUOUSLY
ON FOR AN ALARM
•
BLINKS ONCE TO
CONFIRM A STOP
STOP BUTTON
•
HOLD FOR ONE
SECOND TO STOP
SOFT KEYS
EACH KEY'S FUNCTION IS
DEFINED BY THE MENU DESCRIPTION
ON MENU LINE ABOVE
Fig. 10 — LID Default Screen
COMPRESSOR DATE TIME
ON TIME
RUNNING TEMP CONTROL
01-01-95 11:48
LEAVING CHILLED WATER
28.8 HOURS
CHW IN CHW OUT EVAP REF
55.1 44.1 40.7
CDW IN CDW OUT COND REF
85.0 95.0 98.1
OIL PRESS OIL TEMP MTR AMPS
21.8 132.9 93
CCN LOCAL RESET MENU
MENU
LINE
Fig. 11 — LID Service Screen
When an alarm is detected, the LID default screen will
freeze (stop updating) at the time of alarm. The freeze en-
ables the operator to view the machine conditions at the time
of alarm. The Status tables will show the updated informa-
tion. Once all alarms have been cleared (by pressing
the RESET softkey), the default LID screen will return to
normal operation.
LID DEFAULT SCREEN MENU ITEMS — To perform any
of the operations described below, the PIC must be powered
up and have successfully completed its self test.
The Default screen menu selection offers four options
(Status, Schedule, Setpoint, and Service). The Status menu
allows for viewing and limited calibration/modification of
control points and sensors, relays and contacts, and the op-
tions board. The Schedule menu allows for the viewing and
modification of the Local Control, CCN Control, and Ice Build
time schedules. Numerous set points including Base De-
mand Limit, LCW, ECW, and Ice Build can be adjusted un-
der the Setpoint menu. The Service menu can be used to re-
vise alarm history, control test, control algorithm status,
equipment configuration, equipment service, time and date,
attach to network, log out of device, controller identifica-
tion, and LID configurations. Figures 12 and 13 provide ad-
ditional information on the menu structure.
Press the MENU softkey to select from the 4 options. To
view or change parameters within any menu structure, use
the SELECT softkey to choose the desired table or item.
The softkey modification choices displayed will depend on
whether the selected item is a discrete point, analog point, or
an override point. At this point, press the softkey that cor-
responds to your configuration selection or press the
QUIT softkey. If the QUIT softkey is depressed, the
configuration will not be modified. Use the following soft-
keys to access and select the desired section.
12