English (US)
4
5.2 Packaging label
The CU331SP can also be identified by means of the label on the
packaging.
6. Mechanical installation
The individual CU331SP cabinet sizes are characterized by their
enclosures. The table in section 15.2 shows the relationship of
enclosure class and enclosure type.
6.1 Reception and storage
Check on receipt that the packaging is intact, and the unit is
complete. In case of damage during transport, contact the
transport company to file a claim.
Note that the CU331SP is delivered in a packaging which is not
suitable for outdoor storage.
6.2 Transportation and unpacking
The CU331SP must only be unpacked at the installation site to
prevent damage during the transport to the site.
The packaging contains accessory bag(s), documentation and
the unit itself. See fig 2.
Fig. 2 CU331SP packaging
6.3 Space requirements and air circulation
CU331SP units can be mounted side by side, but as a sufficient
air circulation is required for cooling these requirements must be
met:
• Sufficient free space above and below the CU331SP.
• Ambient temperature up to 122 °F (50 °C).
• Hang the CU331SP directly on the wall, or fit it with a back
plate. See fig. 3.
Fig. 3 CU331SP hung directly on the wall or fitted with a back
plate
Required free space above and below the CU331SP
For information about enclosure, see 15.1 Enclosure.
6.4 Mounting
1. Mark and drill holes. See 15.2 Main dimensions and weight.
2. Fit the screws, but leave loose. Mount the CU331SP, and
tighten the four screws.
Fig. 4 Drilling of holes
7. Electrical connection
7.1 Electrical protection
7.1.1 Protection against electric shock, indirect contact
Protective conductors must always have a yellow/green (PE) or
yellow/green/blue (PEN) color marking.
Instructions according to EN IEC 61800-5-1:
• The CU331SP must be stationary, installed permanently and
connected permanently to the mains supply.
• The ground connection must be carried out with duplicate
protective conductors or with a single reinforced protective
conductor with a cross-section of minimum AWG 7 (10 mm
2
).
7.1.2 Protection against short-circuit, fuses
The CU331SP and the supply system must be protected against
short-circuit.
Grundfos requires that the back-up fuses mentioned in15.6 Fuses
and cable cross-section are used for protection against short-
circuit.
The CU331SP offers complete short-circuit protection in case of a
short-circuit on the motor output.
TM05 5990 4012TM03 8859 2607
Enclosure Space [in (mm)]
B1 7.9 (200)
The user is responsible for mounting the
CU331SP securely on a firm surface.
TM03 8860 2607
Warning
The owner or installer is responsible for ensuring
correct grounding and protection according to
national and local standards.
Warning
Before making any work on the CU331SP, the
mains supply and other voltage inputs must be
switched off for at least as long as stated in
section 4. Safety and warnings.
The leakage current to ground exceeds 3.5 mA,
and a reinforced ground connection is required.
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