Operating instructions
32
• Installations with controlled earth equipotential
If the earth potential difference is small: in general, if
all elements connected to the CCN bus are installed in
the same building and if the distance between the
communicating devices is short:
1. Use of a twisted, unshielded cable is normally
sufficient. If there is a problem created by strong
radiated interference in the air (high frequency):
2. Use of a shielded cable with a 75% minimum
recovery rate can increase the immunity of the
cable to high-frequency radiated interference.
In the first instance the shielding connection is
made at a single point. If the problem persists, the
shielding must also be connected near each device
connected to the bus, on a site plan. In all cases
the shielding connection(s) must guarantee an
electrical link along the complete periphery of
the cable.
• Installations with non-controlled earth equipotential
If the machine and the display are located in different
buildings and/or if the distance between the devices is
long (>200 m): a solution can only be established after
an analysis of the installation and its specific
characteristics, and the recommendations below are
only given as basic precautions.
1. Surge absorbers must be installed at both ends of
each cable conductor to prevent the risk of light-
ning strikes.
2. Locating the closed metallic cable in a conduit, or
even locating it in the ground are good ways of
increasing the immunity of the cable against
radiated interference.
3. The installation of common cores at both ends
increases the immunity against interference. The
ferrites are then installed so that they enclose the
complete cable.
NOTE: The use of a shielded cable can cause problems.
ATTENTION: If there may be a difference in the low-
frequency potential between the local earth connections,
this can lead to a dangerous voltage (> 50 V) between the
display and the local earth. In this case the installation
of the accessory wired connection is not recommended.
To connect the 19XR chiller to the network, proceed as
follows (refer to Fig. 24):
1. Cut power to the PIC control panel.
2. Find connector J1 on the ICVC.
3. Cut a CCN wire and strip the ends of the RED,
WHITE, and BLACK conductors (Molex type
strippable connectors - supplier ref. No. 08-50-0189).
4. Using a wirenut, connect the drain wires together.
5. Insert and secure the RED wire to Terminal 1 of the
J1 connector.
6. Insert and secure the WHITE wire to Terminal 2 of
the J1 connector.
7. Insert and secure the BLACK wire to Terminal 3 of
the J1 connector.
8. Mount a terminal strip in a convenient location.
9. Connect the opposite ends of each conductor to
separate terminals on the terminal strip.
10. Cut another CCN wire and strip the ends of the
conductors.
11. Connect the RED wire to the matching location on
the terminal strip.
12. Connect the WHITE wire to the matching location on
the terminal strip.
13. Connect the BLACK wire to the matching location on
the terminal strip.
See Fig. 25 - "Machine isolation".
CAUTION: Protect insulation from weld heat damage
and weld splatter. Cover with wet canvas cover during
water piping installation.
When installing insulation at the job site, insulate the
following components:
• compressor motor
• cooler shell
• cooler tube sheets
• suction elbow
• motor cooling drain
• oil reclaim piping
• plate heat exchanger refrigerant side tubing
• refrigerant liquid line to cooler
• suction chamber waterbox covers
G
+
-
24 VAC
R
CVC
J6
SERVICE
0
J7
J1
J6
}
G
+
-
24 VAC
R
CVC
J6
SERVICE
0
J7
J1
J6
}
G
+
-
24 VAC
R
CVC
J6
SERVICE
0
J7
J1
J6
}
0. Alarm
1. Ground wire
2. Ground
3. Black
4. White
5. Red
6. Terminal strip
7. Chassis ground
8. Chiller Visual Control ICVC
9. 19XR chillers
10. Factory-wiring
11. Field-wiring