Calpeda NR, NR4 Close-coupled, single-impeller, centrifugal pumps - Nr, Nrs

Applications

For clean liquids without abrasives, which are non-aggressive for the pump

materials ( solids content up to 0.2%).

For heating, air-conditioning, cooling and circulation plants.

For civil and industrial applications.

When low noise operation is required (n ≈ 1450 rpm).

Operating conditions

Liquid temperature from -10 °C to +90 °C.

Ambient temperature up to 40° C.

Total suction lift up to 7 m.

Maximum permissible working pressure up to 10 bar.

Continuous duty (S3 60% for single-phase pump to 1,5 kW).

Motor

2-pole induction motor, 50 Hz (n ≈ 2900 rpm).

NR(D), NRS: three-phase 230/400 V ± 10% up to 3 kW;

400/690 V ± 10% from 4 to 37 kW;

NRM:single-phase 230 V ± 10%.

4-pole induction motor, 50 Hz (n ≈ 1450 rpm).

NR4: three-phase 230/400 V ± 10% up to 3 kW;

400/690 V ± 10% from 4 to 5,5 kW.

Insulation class F.

Protection IP 54.

Motor suitable for operation with frequency converter from 0,37 kW for NR4 and

from 1,1 kW for NR(D).

IE2 efficiency class for single-phase motors up to 1,1 kW.

IE3 efficiency class for three-phase motors (IE2 up to 0,65 kW).

Constructed in accordance with: EN 60034-1; EN 60034-30-1.

EN 60335-1, EN 60335-2-41.

Special features on request

Other voltages.

Impeller in chrome-nickel stainless steel AISI 316. (from NR. 40.. to NR. 80..)

Frequency 60 Hz (as per 60 Hz data sheet).

Protection IP 55.

Special mechanical seal

Higher or lower liquid or ambient temperatures.

Motor suitable for operation with frequency converter up to 0,33 kW for NR(D)4

and up to 0,75 kW for NR(D).

Designation

Example: NR(D)(S)(4)(M) EI 50/125A/A

NR = Series

D = Twin head

S = Series Version Stub-Shaft

4 = = 4-pole version (without indication, 2-pole version)

M = Single-phase version (no indication: three-phase)

EI = With frequency converter I-MAT

50 = Delivery port diameter in mm

125 = Nominal impeller diameter

A = Impeller diameter

/A = It refers to a revision

The electropumps comply with the European Regulation no. 547/2012.

Materials

Components                                           Materials

Pump casing                                          Cast iron GJL 200 EN 1561

Lantern bracket                                      Cast iron GJL 200 EN 1561

Impeller                                                 Cast iron GJL 200 EN 1561 (Brass CW617N EN 12165 for NR-NR4 32..., 40..., 50/200)

Shaft                                                     Chrome-nickel steel 1.4305 EN 10088 (AISI 303)

                                                             Steel 1.4104 EN 10088 AISI 430F (NR 32/12, NR, NR4 50)

Valve                                                     Chrome-nickel steel AISI 304 - NBR

Mechanical seal                                      Carbon - Ceramic - NBR

Counter-flanges                                      Steel 1.0044 EN 10025-2 (Fe 430B)