Installation In The Usa And Canada; General Considerations - Grundfos CRE Series Installatie- En Bedieningsinstructies
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Appendix
1. Installation in the USA and Canada
In order to maintain the UL/cURus approval, follow
these additional installation instructions.
Note
The UL approval is according to UL508C.
1.1 Electrical connection
1.1.1 Conductors
Use 140/167 °F (60/75 °C) copper conductors only.
1.1.2 Torques
Power terminals
Motor size [kW]
Thread size
Up to 7.5 kW
11-22 kW
Relay, M2.5:
0.5 Nm.
Input control, M2: 0.2 Nm.
1.1.3 Line reactors
Max line reactor size must not exceed 2 mH.
1.1.4 Fuse size/circuit breaker
If a short circuit happens the pump can be used on a mains
supply delivering not more than 5000 RMS symmetrical amperes,
600 V maximum.
Fuses
When the pump is protected by fuses they must be rated for
480 V. Maximum sizes are stated in table below.
Motors up to and including 7.5 kW require class K5 UL-listed
fuses. Any UL-listed fuse can be used for motors from 11 to
22 kW.
Circuit breaker
When the pump is protected by a circuit breaker this must be
rated for a maximum voltage of 480 V. The circuit breaker must
be of the "Inverse time" type.
The interrupting rating (RMS symmetrical amperes) must not be
less than the values stated in table below.
USA - hp
2-pole
4-pole
Fuse size
1
1
25 A
1.5
1.5
25 A
2
2
25 A
3
3
25 A
5
5
40 A
7.5
-
40 A
10
7.5
50 A
15
15
80 A
20
20
110 A
25
25
125 A
30
-
150 A
Torque [Nm]
M4
2.35
Min. 2.2
M4
Max. 2.8
Circuit breaker type/model
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
40 A / Inverse time
40 A / Inverse time
50 A / Inverse time
80 A / Inverse time
110 A / Inverse time
125 A / Inverse time
150 A / Inverse time
Europe - kW
2-pole
4-pole
Fuse size
-
0.55
25 A
0.75
0.75
25 A
1.1
1.1
25 A
1.5
1.5
25 A
2.2
2.2
25 A
3
3
25 A
4
4
40 A
5.5
-
40 A
7.5
5.5
50 A
11
11
80 A
15
15
110 A
18.5
18.5
125 A
22
-
150 A
1.1.5 Overload protection
Degree of overload protection provided internally by the drive,
in percent of full-load current: 102 %.
1.2 General considerations
For installation in humid environment and fluctuating
temperatures, it is recommended to keep the pump connected to
the power supply continuously. This will prevent moisture and
condensation build-up in the terminal box.
Start and stop must be done via the start/stop digital input
(terminal 2-3).
1
Circuit breaker type/model
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
25 A / Inverse time
40 A / Inverse time
40 A / Inverse time
50 A / Inverse time
80 A / Inverse time
110 A / Inverse time
125 A / Inverse time
150 A / Inverse time
765
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