Operating instructions

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8.2.2 - Lifting of the VFD control box
Precautions must be taken to prevent any damage due to a
fall or shock, if the VFD control box is removed. A fork-lift
truck or a similar lifting and transport device can be used.
Place chains on the VFD so that there is an equal load at the
lifting points. Use a lifting beam, if the angle of the chains
is less than 45° from the horizontal level. Avoid shocks when
the VFD is lifted.
CAUTION: For control box VFD 900 – 1160A, the lifting
brackets on top of the control box permit attaching chains
to the VFD control box. They must never be used to chain
and lift the chiller.
Use the following procedure to lift the VFD
• Attach a chain to each lifting hole provided at the
lifting supports (these lifting supports are factory-
installed at the top of the VFD control box. Ensure
that the chains do not form an angle of less than 45°
to the horizontal level.
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1. Condenser
2. Evaporator
3. VFD box
4. Motor terminal box (middle part)
5. Compressor motor
45° minimum
• Use an overhead or independent lifting bridge (nominal
capacity of 2 tonnes minimum), attach a fall-arresting
chain to each point to ensure safe lifting of the VFD.
• Lift to apply tension and remove the screws fixing the
VFD control box to its support on the condenser.
NOTE: To re-assemble follow these instructions in reverse
order. Connect the sensors and the cables after securing
the installation of the main parts, to avoid the risk of
damaging them.
8.2.3 - Separate the evaporator from the condenser
NOTE: If condenser and evaporator must be separated,
the heat exchangers must be kept level by placing a support
plate under the tube sheets. The support plate helps keeping
the heat exchangers level and aligning them when they
are re-assembled.
Remove all cables from the probes and sensors. Cut the
cable paths required to separate the two heat exchangers.
ATTENTION: With VFD control box 900 or 1160A the
evaporator must not be separated from the condenser
without first disconnecting and removing the control box.
The VFD control box type has a high-level centre of gravity
and can tip over at the moment when the heat exchangers
are separated, if the control box is not separated first.
This can result in material damage and a serious injury
risk for the personnel.
• Place a support plate under each tube sheet to keep
the heat exchangers level.
• Cut the motor cooling line at the point shown in Fig.
41 - "Detailed perspective view of the unit", item 2.
• Disconnect discharge elbow from the compressor.
• Disconnect liquid line flange from the float chamber,
indicated in in Fig. 41, item 8.
• Plug all openings. Disconnect all cables that cross from
one heat exchanger to the other (see Fig. 42 - "Unit
rear/side"):
- Probe and sensor cables of the water boxes.
- Motor power wiring cables from the terminal box.
- Communication and connecting cables between the
VFD and the interface box.
• Remove the connecting plates from the tube sheets
(see Fig. 41, item 5).
• Keep the disconnected heat exchangers separate.
8.2.4 - Separate the compressor from the evaporator
• Remove the suction and discharge bends (see Fig. 41,
items 1 and 10).
• Cut the motor cooling line at the point shown in Fig. 41,
item 2.
• Disconnect the motor cooling return line, as shown in
Fig. 41, item 2.