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5 Commissioning
5.1 Preparations
5.1.1 Before initial start up
•
The power supply should 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 protec-
tion switches
are set to ON.
The control system of the air handling unit has a pre-pro-
grammed factory setting, which makes the cooling unit
ready for operation when the basic settings have been
performed. The function for the cooling unit should be
activated, see the Operation and Maintenance Instructions
of the GOLD for particulars on how to handle the menus
in the hand-held terminal
5.1.2 Starting up
•
Set the safety isolating switch of the cooling unit to
ON.
•
Check the phase sequence, see Section 5.1.4.
•
Check that light-emitting diode L2 on the IQnomic
Plus module steadily shines (24 V supply), and that
light-emitting diode L1 is fl ashing (communication).
The function switch should be in the position given in
table below section 13 Commissioning Protocol.
•
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 DXS has been selected under
Cooling Regulation.
•
Enter the manual test menu via the hand-held termi-
nal of the air handling unit, see the Operation and
Maintenance Instructions of the GOLD.
•
Check: First start the fan, then start one cooling com-
pressor at the time, if any cooling compressor does
not start, an alarm will be initiated.
•
Set the cooling compressors to 0 (stop).
•
Go back to the main menu.
•
The cooling unit is now ready for operation and will
start when there is a cooling load.
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.
The compressor is stopped or stepped down when the
operation pressure is outside of the limit values. The text
COOL PRESSURE LIMITING is displayed in the hand-held
terminal until the pressure again comes within limit values.
The compressor is permitted to restart when the restart
delay has expired.
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5.1.4 Phase-sequence monitor
The cooling unit is equipped with phase sequence monitor
to ensure that the compressors are rotating in the correct
direction.
The phase sequence monitor is installed in the electrical
equipment cubicle, see drawing.
Alarm 164-166, COOL DXS K1-3 tripped, is displayed
in the hand-held terminal of the air handling unit. The
alarms may be due to several causes: incorrect phase se-
quence, tripped high pressure switch (BP2) or the absence
of control voltage.
Electrical equipment in the COOL DXS
1
5
5
0
0
P1
P1
1
The phase sequence is correct when LED 1 is lit.
The voltage is connected when LED 2 is lit.
5.1.5 Measure whether the phase-sequence is wrong
!
Warning
May only be performed by authorised or trained service
personnel.
•
Stop the cooling unit by selecting SHUT OFF in the
menu SETTINGS.
•
Set the safety switch to position OFF on the cooling
unit.
•
Isolate the power supply to the cooling unit.
Important
Check that the incoming power supply to the CoolDX 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).
•
Connect the power supply to the cooling unit.
•
Set the safety switch to ON.
•
Start the cooling unit as described in the section deal-
ing with starting up, see Section 5.1.2 Starting up.
6 Alarms
For a description of the alarms, see the Operation and
Maintenance Instructions for the GOLD.
We reserve the right to alter specifi cations.
GB.COOLDXS.INS.100507
L1-L2-L3
1
2
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