Installation In The Usa And Canada; General Considerations - Grundfos CRE Instrucciones De Instalación Y Funcionamiento

Appendix

1. Installation in the USA and Canada

In order to retain the UL/cUL approval, follow these
additional installation procedures. The UL approval is
according to UL508C.
1.1 Electrical connection
1.1.1 Conductors
Use minimum 140/167 °F (60/75 °C) copper conductors only.
1.1.2 Torques
Power terminals
Power terminal: 1.7 ft-lbs
Relay, M2.5: 0.4 ft-lbs
Input control, M2: 0.15 ft-lbs
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 power
supply delivering not more than 5000 RMS symmetrical amperes,
480 V maximum.
Fuses
When the pump is protected by fuses they must be rated for 600
V. Maximum sizes are stated in table below.
Up to 10 hp use Class K5 UL Listed fuses. For 10 to 30 hp use
any class UL Listed fuse.
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
1.1.5 Overload protection
Degree of overload protection provided internally by the drive, in
percent of full-load current: 102 %.
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

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).
1.3 Outdoor installation
According to UL 778/C22.2 No 108-14 pumps that are intended
for outdoor use shall be marked enclosure type 3 and the product
shall be tested with rated surface temperature down to -31 °F (-
35 °C). The MLE enclosure is approved for type 3 or 4 and rated
surface temperature down to 32 °F (0 °C), thus only for indoor
use in UL 778/C22.2 No 108-14 pump applications. For ambient
temperature during operation, see section
data.
8.2 Other technical
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