Port
Quantity
Description
Outlet ports
2
Diametrically opposed at bottom of jacket. Not external ports – no
outlet connection required during pump installation.
Air vent
1
Automatic. Situated at top of jacket.
Drain
1
Situated at lower part of jacket. ISO G 3/4 threaded connection.
For information regarding the fittings required to drain the cooling jacket, see
Fittings needed to drain cooling
(page 38).
Filling and draining
With integrated cooling, the cooling jacket fills automatically at pump start-up.
For instructions on draining the cooling jacket, see
Empty the coolant (integrated cooling)
(page 85).
Z-installation orientation
Z-installations using integrated cooling require a specific orientation. The drive unit must be oriented such
that the air evacuation system and the stator housing leakage sensor function properly. The cooling jacket
inspection cover marked “SENSORS” must be oriented downwards.
External Cooling
With external cooling, the drive unit is equipped with a cooling jacket. Water circulates through the jacket,
cooling the motor. The cooling water circuit may be open or closed. In both cases, it is completely isolated
from the pumped media.
The figure below shows the principle of the external cooling system.
Applications where external cooling might be used include the following:
• If the temperature of the pumped media exceeds 40°.
• When extreme amounts of concentrated sewage where grease or fats are present, is combined with
operating close to the limits of the cooling system.
• When the pumped media contains abrasive or corrosive components.
• In variable speed applications, where the lowest speed falls below the speed limit for the integrated
cooling system during longer periods of operation.
With external cooling, the cooling jacket is equipped with the following ports:
Port
Quantity
Description
Inlet port
1
Located at bottom of jacket. Threaded ISO G 3/4.
Outlet port
1
Located at top of jacket. Threaded ISO G 3/4. Also used to drain
jacket.
Air vent
1
Located at top of jacket.
For information regarding the fittings required to drain the cooling jacket, see
Fittings needed to drain cooling
(page 38).
Product Description
C3300/6x5, C/R3231, C3240, C3306, C3312, C3351, C3356, C3400, C3501, C3531, C3602, C3800 Installation,
Operation and Maintenance Manual
35