Operating instructions
62
Refer to the dimensional drawings supplied with the machine.
10.5.1 - Power connections
19XRV units have only one power connection point,
located in the VFD control box.
Cable sizing is the responsibility of the installer and must
comply with the characteristics and regulations specific to
each installation site. The connections supplied as standard
for the incoming customer power cables on the circuit
breaker/main disconnect switch are designed to receive the
number and type of wire sections defined in the table below.
19XR-506---912 3 95 to 240 34
19XR-506---922 3 95 to 240 34
19XR-506---802 4 50 to 300 42
19XR-506---812 4 50 to 300 42
The use of exible multi-standed conductors is possible, but care must be
taken to ensure that strands are not caught in the screw threads. The ends of the
conductors must be equipped with ferrules.
Before connecting the power cables (L1 - L2 - L3), ensure
that the sequence is correct.
10.5.2 - Report and control connections on site
For the site control wiring of the following elements refer
to the 19XR PIC III controls manual and the certified
wiring diagram supplied with the unit:
On the CCM board in the PIC III control box:
• Remote set point reset (4-20 mA), J5-3/4 CCM
• Demand limiter, J5-1/2 CCM
• Operating capacity percentage, J8-1/2 CCM
On the terminal strip in the compressor VFD cabinet:
• Safety shutdown, TB1-20/21
• Ice storage contact, TB1-21/22
• Remote start/stop button, TB1-23/24
• Condenser pump control, TB2-1/2
• Evaporator pump control, TB2-3/4
• Alarm report, TB2-9/10
Safety consideration reminder: Disconnect the power supply
before working on the control box. The circuit breaker/
main disconnect switch allows isolation of the complete
electrical equipment from its power supply with the excep-
tion of the power conductor connection terminals for the
installation. Specifically, it disconnects the PIC III control
box.
IMPORTANT
• Disconnecting the power equipment using the handle
of disconnect switch QF101 also disconnects the
control equipment and power supply to the oil pump.
To prevent compressor lubrication problems, do not
switch off the machine using the disconnect switch, if
the compressor is still energized.
• An emergency shutdown to protect the capacitor coils
can be initiated at any time by the control, while power
is supplied to the variable-frequency drive. This shut-
down acts on the circuit breaker/main disconnect
switch.
Never apply voltage to the variable-frequency drive
that cannot be deenergized by the circuit breaker/main
disconnect switch: connection of 400 V voltage to the
variable-frequency drive must be upstream of the
circuit breaker/main disconnect switch. Specifically,
do not:
- connect a power supply bypass circuit upstream
of the secondary disconnect switch QF in the
VFD control box.
- connect a power supply bypass circuit upstream
of the control box and the PIC III control, if the
disconnect switch QF is conducting.
11.1.1 - Opening the VFD cooling line isolation valve
The three isolation valves installed on the VFD cooling
pipes must be open:
• Valves A and B located under the condenser
• Valve C located behind the VFD control box.