Installing The Product In The Usa And Canada; Electrical Connection; General Considerations; Disposing Of The Product - Grundfos LFE Instrucciones De Instalación Y Funcionamiento

28.3.6 Liquid temperature
The maximum liquid temperature depends on the material of the
mechanical shaft seal, o-rings and gaskets used:
• Temperature range for BUNA:
32-212 °F (0-100 °C).
• Temperature range for VITON
59-275 °F (15-135 °C).
• Temperature range for EPDM:
59-275 °F (15-135 °C).
28.3.7 Outlet pressure
Maximum outlet pressure
The maximum outlet pressure is the pressure for total dynamic
head (TDH) stated on the pump nameplate.
28.3.8 Inlet pressure
Minimum inlet pressure
The minimum inlet pressure must correspond to the NPSH curve
for the pump + a safety margin of minimum 1.6 ft (0.5 m) head.
Pay attention to the minimum inlet pressure to avoid cavitation.
The risk of cavitation is higher in the following situations:
• The liquid temperature is high.
• The flow rate is considerably higher than the pump's rated flow
rate.
• The pump is operating in an open system with suction lift.
• The inlet conditions are poor.
• The operating pressure is low.
Maximum inlet pressure
Inlet pressure + pump pressure must be lower than the maximum
pressure or total dynamic head (TDH) of the pump.

29. Installing the product in the USA and Canada

In order to maintain the UL/cUL approval, follow
these additional installation instructions. The UL
approval is according to UL508C.

29.1 Electrical connection

29.1.1 Conductors
Use minimum 140/167 °F (60/75 °C) copper conductors only.
29.1.2 Torques
Power terminals
Power terminal: 1.7 ft-lbs (2.3 Nm)
Relay, M2.5: 0.4 ft-lbs (0.5 Nm)
Input control, M2: 0.15 ft-lbs (0.2 Nm).
29.1.3 Line reactors
Max. line reactor size must not exceed 2 mH.
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29.1.4 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. Use a circuit breaker 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
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
29.1.5 Overload protection
Degree of overload protection provided internally by the drive, in
percent of full-load current: 102 %.

29.2 General considerations

For installation in humid environment and fluctuating
temperatures, we recommend 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).

30. Disposing of the product

This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
Circuit breaker type/model
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
Subject to alterations.