English (GB)
7
6.5 Avoiding condensation in the motor
If the liquid temperature falls below the ambient
temperature, condensation may form in the motor
during standstill. Condensation can occur in moist
surroundings or areas with high humidity.
In such cases, use a motor suitable for condensing
environments such as an IPX5 motor available from
Grundfos.
Alternatively, open the bottom drain hole in the motor
flange by removing the plug. See fig. 7. This reduces
the motor enclosure class to IPX5.
Fig. 7 Motor drain plug
The open drain hole helps prevent condensation in
the motor as it makes the motor self-venting and
allows water and humid air to escape.
When you install the pump outdoors, provide the
motor with a cover to avoid condensation. See fig. 8.
Fig. 8 Examples of covers (not supplied by
Grundfos)
7. Electrical installation
Carry out the electrical connection according to local
regulations.
Check that the supply voltage and frequency
correspond to the values stated on the nameplate.
7.1 Power supply cable
In order to comply with the EN 60335-1 standard, the
power supply cable must as minimum be rated for an
operating temperature of 105 °C (221 °F).
7.2 Motor protection
Single-phase motors, 1 x 115 / 230 V, 60 Hz
These motors do not incorporate motor protection
and must be connected to a motor-protective circuit
breaker which can be manually reset.
Set the motor-protective circuit breaker to maximum
1.15 x I
1/1
.
Other single-phase motors
These motors have built-in current- and
temperature-dependent motor protection in
accordance with IEC 60034-11 and require no further
motor protection. The motor protection is of the TP
211 type which reacts to both slow- and quick-rising
temperatures. The motor protection is automatically
reset.
Three-phase motors up to 3 kW
These motors must be connected to a
motor-protective circuit breaker which can be
manually reset.
Set the motor-protective circuit breaker to maximum
1.15 times full-load current.
TM06 3860 1015
Pos. Description
1 Motor drain plug
TM05 3496 3512
Warning
The electrical connection must be carried
out in accordance with local regulations.
Before starting work on the pump, switch
off the power supply. Make sure that the
power supply cannot be accidentally
switched on.
The pump must be connected to an
external all-pole mains switch according to
local regulations.
The product must be earthed and
protected against indirect contact in
accordance with local regulations.
Wires connected to supply terminals, must
be separated from each other and from the
supply by reinforced insulation.
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