19XR (PIC II) Hermetic Centrifugal Liquid Chillers 50 Hz - Carrier

Insulate Motor Terminals and Lead Wire Ends
Insulate compressor motor terminals, lead wire ends, and
electrical wires to prevent moisture condensation and electrical
arcing. For low-voltage units (up to 600 V), obtain insulation
material from machine shipping package consisting of 3 rolls
of insulation putty and one roll of vinyl tape.
Insulate each terminal by wrapping with one layer of
insulation putty.
Overwrap putty with 4 layers of vinyl tape.
High-voltage units
High-voltage units require special terminal preparation. Follow
electrical codes for high-voltage installation. Vinyl tape is not
acceptable; a high voltage terminal method must be used.
CAUTION: A cable conduit is provided in the bottom of the
control box for field wiring connections.
General remarks on Fig. 23
All field-supplied conductors, devices, field-installation
wiring, and termination of conductors and devices must be
in compliance with all applicable codes and job specifications.
The routing of field-installed conduit and conductors and
the location of field-installed devices must not interfere with
equipment access or the reading, adjusting, or servicing of
any component.
Equipment, installation, and all starting and control devices
must comply with details in equipment submittal drawings
and literature.
Contacts and switches are shown in the position they would
assume with the circuit deenergized and the chiller shut down.
Installer is responsible for any damage caused by improper
wiring between starter and machine.
Electrical connection of the starter
The compressor motor and the regulating part must be earthed
to the starter cabinet.
Control wiring
Do not use the regulating transformer to supply the pilot relays.
The wiring running between starter and regulation must be
shielded and connected on both sides (600 V/ 80ºC cables min.).
If the oil pump disconnect is not included in the starter, it must
be installed in view of the unit with appropriate wiring.
Wiring between the starter and the compressor motor
Low voltage (600 V or less) compressors have six terminal studs.
Between 3 and 6 leads must be run to the starter, depending on
the type of starter employed. If only 3 are used, jumper the
terminals as follows: 1 to 6, 2 to 4 and 3 to 5. Centre-to-centre
distance between terminals is 82/125 mm (frame 3 compressor/
frame 4 compressor). The starter must have a nameplate stamped
as conforming with the requirements of Carrier Technical
Specifications EE038.
The terminal studs must not take the weight of the leads: if
necessary, use intermediate supports. Use a torque spanner to
tighten the terminal nuts to 200 N maximum, maintaining the
terminal with an additional spanner.
Compressor Diameter Distance between terminals (from centre line)
3 15.9 82
4 15.9 82
5 22.2 125
3.6.6 - Connect the starting cabinet to the control box
See Fig. 24 - Connect the starter cabinet to the unit control box.
In addition, connect the communication cable (SIO) directly
from the control box to the starter cabinet. All regulating cables
must be shielded. Connect the communication cable (shielded
cable, type LIYCY).
Consult the job wiring diagrams for cable type and number.
Ensure that the control circuit is properly earthed in accordance
with electrical standards and with the instructions on the machine
control wiring label.
3.6.7 - Carrier Comfort Network interface (CCN)
The Carrier Comfort Network (CCN) communication bus wiring
is supplied and installed by the electrical contractor. It consists
of shielded, 3-conductor cable with metallic braiding.
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 Fig. 21 for location
of the CCN network connector on the CVC (J1) module.
When connecting the CCN communication bus to a system element,
a color code system for the entire network is recommended
to simplify installation and checkout. The following color code
is recommended:
Signal CVC connector CCN Bus conductor
type* insulation colour
+ 1 Red
Ground 2 White
- 3 Black
* Cable type to be used: shielded cable LIYCY
If a cable with a different color scheme is selected, a similar
color code should be adopted for the entire network.
At each system element, the shields of its communication bus
cables must be tied together. If the communication bus is
entirely within one building, the resulting continuous shield must
be connected to ground at only one single point (see Fig. 21).
If the communication bus cable exits from one building and
enters another, the shields must be connected to ground at the
lightening suppressor in each building where the cable enters
or exits the building (one point only).
To connect the 19XR chiller to the network, proceed as follows
(Fig. 21):
1. Cut power to the PIC II control panel.
2. Find connector J1 on the CVC.
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