GB.COOLDX.IN.E.130821
We reserve the right to alter specifications.
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5
COMMISSIONING
5.1 Preparations
5.1.1 Before initial start up
• The power supply must be connected.
• The communication cable to the GOLD air handling
unit should be connected to one of the connections
marked Internal EIA-485.
•
Check that all the safety switches and motor protection
switches are switched on.
•
Check that the function selector switch on the IQnomic Plus
module is set as described in Section 13. Commissioning
Record.
The control system of the GOLD has a pre-programmed factory
setting, which makes the cooling unit ready to use after basic
settings have been entered. The COOL DX function should be
activated. See the Operation and Maintenance Instructions for
the GOLD dealing with managing the menus in the hand-held
micro terminal.
5.1.2 Starting up
• Check that light-emitting diode L2 on the IQnomic
Plus module steadily shines (24 V supply), and that
light-emitting diode L1 is flashing (communication).
• Check in the hand-held micro terminal of the GOLD
unit that Auto Operation has been selected as the air
handling unit’s cooling function (under Operation
Mode), and that COOL DX Economy or COOL DX Comfort
1)
has been selected under Cooling Regulation.
• Go to the Manual Test Menu in the hand-held micro
terminal of the GOLD unit. See the Operation and
Maintenance Instructions for the GOLD unit.
Navigate to COOL DX.
•
Check: Start one compressor at a time. If any compressor
doesn’t start, an alarm will be initiated. The direction of rotation
in the COOL DX compressors is important, see Section 5.1.4
Phase sequence guard.
• Set the compressors to 0 (stop).
• Go back to the main menu.
• COOL DX is now ready for operation and will start when
there is a cooling load.
1)
not the COOL DX Top
5.1.3 Pressure Sensor
The cooling unit has two in-service pressure switches in each
cooling circuit, one for low pressure and one for high pressure.
If the operating pressure, in any of the circuits, exceeds or drops
below a limit value, the relevant compressor is switched off. The
text COOL DX PRESSURE LIMITING is displayed in the hand-held
terminal until the pressure comes within the limit values again.
The compressor is permitted to restart when the restart delay has
expired.
Pressure sensor settings:
Value
Setting
range
Factory set-
ting
Compressor 1
Low pressure limitation
1-10 bar
4,0 bar
Low pressure alarm limit
1-10 bar
3.0 bar
High pressure limitation
25-50 bar
39,0 bar
High pressure alarm limit
25-50 bar
40,5 bar
Compressor 2
Low pressure limitation
1-10 bar
4,0 bar
Low pressure alarm limit
1-10 bar
3.0 bar
High pressure limitation
25-50 bar
39,0 bar
High pressure alarm limit
25-50 bar
40,5 bar
5.1.4 Phase-sequence monitor
The COOL DX/COOL DX Top is equipped with phase se-
quence guard for compressors (not applicable to sizes 05
and 08, capacity variant 1).
The phase sequence monitor for capacity variant 2 is in-
stalled in the electrical equipment cubicle, see illustration.
Alarm no. 171 is initiated if the phase sequence is faulty.
5.1.5 Remedial action if wrong phase sequence
Warning
May only be carried out by an authorised electrician or
trained service personnel.
• Stop the COOL DX/COOL DX Top by selecting SHUT OFF in the
menu SETTINGS.
• Set the safety switch to position OFF on the
COOL DX/COOL
DX Top.
• Isolate the power supply to the
COOL DX/COOL DX Top.
Important
Check that the incoming power supply to the
COOL DX/
COOL DX Top
is isolated by measuring.
•
Transpose the two phase wires on the incoming power
supply cable in order to obtain correct phase sequence
(direction of rotation).
• Reconnect on power supply to the
COOL DX/COOL DX Top.
• Set the safety isolating switch to the ON position.
• Start the
COOL DX/COOL DX Top as described in Section
5.1.2 Starting up.
6
ALARMS
For a description of the alarms, see the Operation and Mainte-
nance Instructions for the GOLD.
The phase sequence is correct when LED 1 is lit.
The voltage is connected when LED 2 is lit.
1
PS
C
DPA51 3-Phase monitoring relay
1
2
