Carrier Comfort Network Interface; Check Starter - Carrier 19XR Start-Up, Operation And Maintenance Instructions Manual

2. On low-voltage compressors (600 v or less) connect a
voltmeter across the power wires to the compressor starter
and measure the voltage. Compare this reading to the
voltage rating on the compressor and starter
nameplates.
3. Compare the ampere rating on the starter nameplate to
rating on the compressor nameplate. The overload trip
amps must be 108% to 120% of the rated load amps.
4. The starter for a centrifugal compressor motor must con-
tain the components and terminals required for PIC II
refrigeration control. Check the certified drawings.
5. Check the voltage to the following components and
compare it to the nameplate values: oil pump contact,
pumpout compressor starter, and power panel.
6. Ensure that fused disconnects or circuit breakers have
been supplied for the oil pump, power panel, and
pumpout unit.
7. Ensure all electrical equipment and controls are prop-
erly grounded in accordance with job drawings, certi-
fied drawings, and all applicable electrical codes.
8. Ensure the customer's contractor has verified proper op-
eration of the pumps, cooling tower fans, and associated
auxiliary equipment. This includes ensuring motors are
properly lubricated and have proper electrical supply and
proper rotation.
9. For field-installed starters only, test the chiller compres-
sor motor and its power lead insulation resistance with
a 500-v insulation tester such as a megohmmeter. (Use
a 5000-v tester for motors rated over 600 v.) Factory-
mounted starters do not require a megohm test.
a. Open the starter main disconnect switch and follow
lockout/tagout rules.
If the motor starter is a solid-state starter, the
motor leads must be disconnected from the starter
before an insulation test is performed. The voltage
generated from the tester can damage the starter
solid-state components.
b. With the tester connected to the motor leads, take
10-second and 60-second megohm readings as
follows:
6-Lead Motor — Tie all 6 leads together and test be-
tween the lead group and ground. Next tie the leads
in pairs: 1 and 4, 2 and 5, and 3 and 6. Test between
each pair while grounding the third pair.
3-Lead Motor — Tie terminals 1, 2, and 3 together
and test between the group and ground.
c. 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.
If the readings on a field-installed starter are unsat-
isfactory, repeat the test at the motor with the power
leads disconnected. Satisfactory readings in this sec-
ond test indicate the fault is in the power leads.
NOTE: Unit-mounted starters do not have to be meg-
ohm tested.
10. Tighten all wiring connections to the plugs on the ISM
and CCM modules.
11. On chillers with free-standing starters, inspect the power
panel to ensure that the contractor has fed the wires into
the bottom of the panel. Wiring into the top of the panel
can cause debris to fall into the contactors. Clean and
inspect the contactors if this has occurred.
Carrier Comfort Network Interface —
Comfort Network (CCN) communication bus wiring is sup-
plied 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 installation manual.
NOTE: Conductors and drain wire must be 20 AWG
(American Wire Gage) minimum stranded, tinned copper. In-
dividual 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 tempera-
ture 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 sys-
tem element, a color code system for the entire network is
recommended to simplify installation and checkout. The fol-
lowing color code is recommended:
CCN BUS CONDUCTOR
SIGNAL TYPE
INSULATION COLOR
+
Ground
−

Check Starter

BE AWARE that certain automatic start arrangements
can engage the starter. Open the disconnect ahead of
the starter in addition to shutting off the chiller or pump.
Use the instruction and service manual supplied by the
starter manufacturer to verify the starter has been installed
correctly, to set up and calibrate the starter, and for complete
troubleshooting information.
The main disconnect on the starter front panel may not
deenergize all internal circuits. Open all internal and re-
mote disconnects before servicing the starter.
52
The Carrier
CABLE NO.
2413 or 5463
A22503
8772
02525
CVC PLUG J1
PIN NO.
Red 1
White 2
Black 3