Commissioning; Preparations; Before Initial Start Up; Control Functions - Swegon COOL DX 008 Installation And Maintenance Instructions Manual

5

COMMISSIONING

5.1

Preparations

5.1.1

Before initial start up

• The power supply should be connected.
• Terminals 105 and 106 in COOL DX electrical cabi-
net must be connected (closed switch), otherwise
the cooling machine will not start despite the signal
0 – 10 V, and no compressors are activated. (These
terminals can be used to connect an external thermo-
stat to activate/deactivate signal 0 – 10 V for a specific
temperature).
• Terminals 103 and 104 shall be connected to give a
signal, 0-10 V.
A free contact for a general alarm is located on terminals
100, 101 and 102.
5.1.2

Control functions

Silver Cool DX is equipped with two controls:
• IC208CX Dixell, hardware version 7.3 or 4.2
• Siemens (model: 12/24 RC 6ED1052-1MD08-0BA0)
Signal 0-10 V is received by the Siemens control which
converts it to digital output signals (see below) and for-
wards these to control IC208CX.
Control IC208CX is set at the factory to moto-condenser
mode and starts or stops the compressors via the digital
output signals from the Siemens control. All control and
safety functions for the refrigerant circuit are regulated by
control IC208CX.
For conversion of the signal, 0 – 10 V to digital output
signals, see below.
When the 0-10 V increases:
• Point 1: Q1 and Q2 = OFF
• Point 2: signal increases to above 1 V, then Q1= ON
and Q2 = OFF
• Point 3: signal increases to above 4 V, then Q1= OFF
and Q2 = ON
• Point 4: signal increases to above 7 V, then Q1= ON
and Q2 = ON
When the 0-10 V decreases:
• Point 4: signal decreases to below 7 V, then Q1= OFF
and Q2 = ON
• Point 3: signal decreases to below 4 V, then Q1= ON
and Q2 = OFF
• Point 2: signal decreases to below 1 V, then Q1= ON
and Q2 = OFF
• Point 1: Q1 stops when the signal reaches 0 V
Q1 and Q2 are the digital output signals that are sent to
control IC208CX to activate compressor 1 and 2.
Q1= compressor with lower cooling capacity
Q2 = compressor with higher cooling capacity
For more information about control and safety functions,
see separate instructions for IC208CX control.
We reserve the right to alter specifications.
5.1.3

Pressure sensor

The chiller has two in-service pressure switches in each
cooling circuit, one for low pressure and one for high pres-
sure.
If the operating pressure, in any of the circuits, exceeds
or drops below a limit value, the relevant compressor is
switched off. See separate instructions for IC208CX con-
trol for further information.
The compressor is permitted to restart when the restart
delay has expired.
Pressure sensor settings:
Value
Compressor 1
Low pressure limitation
High pressure limitation
High pressure alarm limit
Compressor 2
Low pressure alarm limit
High pressure limitation
High pressure alarm limit
GB.COOLDX.SI.G.190603
Setting Factory
range settings
1-10 bar 4.5 bar
25-50 bar 39.0 bar
25-50 bar 42 bar
1-10 bar 4.5 bar
25-50 bar 39.0 bar
25-50 bar 42 bar
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