Specifications

58
11. Apply power to the control center. Go to the ICVC
and access the MENU>SERVICE>VFD CONFIG
DATA>VFD_CONF screen. Confirm that the parameters
entered in VFD_CONF match the information on the
Machine Nameplate and Sales Requisition. Confirm that
the serial numbers on the chiller, Machine Nameplate,
and Sales Requisition are consistent.
Ground Fault Troubleshooting — Use this proce-
dure only if ground faults are declared:
Test the compressor motor and its power lead insulation re-
sistance with a 500-v insulation tester such as a megohmmeter.
With the tester connected to the motor leads, take 10 second
and 60 second megaohm readings as follows:
a. Tie terminals 1, 2, and 3 together and test between
the grouped motor terminals and ground.
b. Divide the 60-second resistance reading by the
10-second reading. The ratio, or polarization
index, must be one or higher. Both the 10 and
60-second readings must be at least 50 megohms.
c. If the readings are unsatisfactory, repeat the test
with the motor leads disconnected from the motor.
Satisfactory readings in this second test indicate
the fault is in the power leads.
Carrier Comfort Network
®
Interface — The Carrier
Comfort Network (CCN) communication bus wiring is
supplied and installed by the electrical contractor. It consists of
shielded, 3-conductor cable with drain wire.
The system elements are connected to the communication
bus in a daisy chain arrangement. The positive pin of each sys-
tem element communication connector must be wired to the
positive pins of the system element on either side of it. The
negative pins must be wired to the negative pins. The signal
ground pins must be wired to the signal ground pins. See the
23XRV Installation Instructions.
NOTE: Conductors and drain wire must be 20 AWG (Ameri-
can Wire Gage) minimum stranded, tinned copper. Individual
conductors must be insulated with PVC, PVC/nylon, vinyl,
Teflon, or polyethylene. An aluminum/polyester 100% foil
shield and an outer jacket of PVC, PVC/nylon, chrome vinyl,
or Teflon with a minimum operating temperature range of –4 F
to 140 F (–20 C to 60 C) is required. See table below for cables
that meet the requirements.
When connecting the CCN communication bus to a system
element, a color code system for the entire network is recom-
mended to simplify installation and checkout. The following
color code is recommended:
Power Up the Controls and Check the Oil
Heater — Ensure that an oil level is visible in the oil sump
before energizing the controls. A separate 15A Control Power
Circuit Breaker in the control center energizes the oil heater
and the control circuit. When first powered, the ICVC should
display the default screen within a short period of time.
The oil heater is energized when power is applied to the
control circuit. This should be done several hours before start-
up to minimize oil-refrigerant migration. The oil heater is
controlled by the PIC III and is powered through a contactor on
the power panel. This arrangement allows the heater to
energize when the main motor circuit breaker is off for service
work or extended shutdowns. The oil heater relay status (OIL
HEATER RELAY) can be viewed on the COMPRESS table on
the ICVC. Oil sump temperature can be viewed on the ICVC
default screen.
SOFTWARE VERSION — The software part number is
labeled on the backside of the ICVC module. The software
version also appears on the ICVC CONFIGURATION screen
as the last two digits of the software part number.
WARNING
Do not apply power unless a qualified Carrier technician is
present. Electrical shock could cause serious personal
injury or death.
CAUTION
Disconnect the motor leads from the control center before a
motor insulation test is performed. The voltage generated
from the testing equipment will damage the VFD.
Fig. 37 — Machine Electrical Data Nameplate
a23-1555
MANUFACTURER CABLE NO.
Alpha 2413 or 5463
American A22503
Belden 8772
Columbia 02525
SIGNAL TYPE
CCN BUS CONDUCTOR
INSULATION COLOR
ICVC PLUG
J1
PIN NO.
+
Red 1
Ground
White or Clear 2
–
Black 3