Ground Fault Troubleshooting; Ccn Interface And Len Interface; Power Up Controls And Check Oil Heater - Carrier AquaEdge 23XRV Start-Up, Operation And Maintenance Instructions Manual

has occurred. Contact Carrier Service before applying power
if debris may have fallen inside of the power module.
a23-1555
Fig. 32 — Machine Electrical Data Nameplate
WARNING
Do not apply power unless a qualified Carrier technician is
present. Electrical shock could cause serious personal injury or
death.

Ground Fault Troubleshooting

Use this procedure only if ground faults are declared:
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.
Test the compressor motor and its power lead insulation resistance
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:
1. Tie terminals 1, 2, and 3 together and test between the
grouped motor terminals and ground.
2. 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.
3. If the readings are unsatisfactory, repeat the test with the
motor leads disconnected from the motor. Satisfactory read-
ings in this second test indicate the fault is in the power leads.

CCN Interface and LEN Interface

The 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 system 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 minimum
stranded, tinned copper. Individual conductors must be insulated
with PVC, PVC/nylon, vinyl, Teflon
num/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.
MANUFACTURER
ALPHA
AMERICAN
BELDEN
COLUMBIA
When connecting the CCN communication bus to a system ele-
ment, a color code system for the entire network is recommended
to simplify installation and checkout. The following color code is
recommended:
SIGNAL TYPE CCN BUS CONDUCTOR INSULATION COLOR
+
GROUND
–
For Modbus communication wire, Belden 3106A (RS-485 cable)
is recommended.

Power Up Controls and Check Oil Heater

Ensure that an oil level is visible in the oil sump before energizing
the controls. A 4 KVA control transformer located in the VFD
cabinet provides via plug CN1A power to the controls and the 1st
stage oil heater, oil pump, and HGBP. The plug providing the
power from the transformer is labeled CN1A.
Plug CN1B protected by a 25A fuse provides power to the vapor-
izer heater and the 2nd stage oil heater.When first powered, the
PIC6 should display the Home screen within a short period of
time.
The oil heater is energized when power is applied to the control
circuit. Be sure to do this at least 4 hours before start-up to mini-
mize oil-refrigerant migration. Unit will not start unless a specific
oil temperature is reached, so in colder environments the heater
may need to be on longer.
The oil heater is controlled by the PIC6 controls and primary oil
heater is powered through contactor 1C located in the controls sec-
tion of the VFD enclosure. At times PIC6 controls can, depending
on conditions, determine the need to turn on the secondary oil
heater controlled by contactor 5C in order to improve chiller oper-
ation. The power for the 4 KVA transformer which powers all
Carrier controls is pulled from upstream of the main circuit break-
er. This allows the heater to energize when the main motor circuit
breaker is off for service work or extended shutdowns. The oil
heater relay status, both primary and secondary oil heater stage,
1. Teflon is a registered trademark of DuPont.
35
, or polyethylene. An alumi-
1
CABLE NO.
2413 or 5463
A22503
8772
02525
Red
Black
White or Clear