CME-3

Summary

Product Identification

The Grundfos CME 3 is a horizontal, multistage centrifugal pump designed for 50/60 Hz operation. It is part of the broader CM and CME product line.

Variants include:

• CME-A: Featuring cast iron (EN-GJL-200) construction.
• CME-I: Featuring stainless steel (EN 1.4301/AISI 304) construction.
• CME-G: Featuring stainless steel (EN 1.4401/AISI 316) construction.

Operating Limits

The 100% speed of CME pumps is approximately 3400 min⁻¹, irrespective of the input frequency.

The performance range for CM and CME pumps is illustrated with graphs showing Head (H) in meters and pressure (p) in kPa versus Flow Rate (Q) in m³/h and l/s. CME pumps offer an infinite number of performance curves between minimum and maximum limits, each representing a specific speed.

See the official PDF for exact tabulated values and performance curves.

Electrical

CME 3 pumps are available with various supply voltages and frequencies:

• Single-phase:
  • 1 x 200-240 V, 50/60 Hz (supply voltage K)
  • 1 x 208-230 V, 50/60 Hz (supply voltage M)
• Three-phase:
  • 3 x 380-480 V, 50/60 Hz (supply voltage L)
  • 3 x 460-480 V, 60 Hz (supply voltage N)
  • Note: Pumps for supply voltage I (3 x 400 V, 50/60 Hz) were noted as 60 Hz only, with a dual-frequency version expected in January 2011.

Typical motor output power (P2) values observed in the dimension tables include 0.55 kW, 1.10 kW, 1.50 kW, and 2.20 kW.

Mechanical / Hydraulic

The pumps are horizontal, multistage centrifugal units.

Construction Materials

Motor Parts:

• Motor flange: Cast iron
• Stator housing: Silumin (Alu)
• Fan cover: Composite PBT/PC
• Fan: Composite PA 66 30 % GF
• Corrugated spring: Steel
• Terminal box: Composite PC/ASA or silumin (Alu)
• Base plate: Steel, electro-coated or Steel, powder-coated, 60 to 120 μ, NCS 7005
• Diverting disc: Silicone fluid (LSR)
• Bearing cover plate: PPS

Pump Parts:

• Shaft seal:
  • Steel parts: Stainless steel 1.4301/AISI 304 or 1.4401/AISI 316 (1.4401/AISI 316 for CME-G)
  • Seal faces: Al₂O₃/carbon or SiC
• Pump shaft: Stainless steel 1.4057/AISI 431 (for CME-A) or 1.4301/AISI 304 or 1.4401/AISI 316 (1.4401/AISI 316 for CME-G)
• O-rings: EPDM, FKM or FFKM
• Gasket: Paper (only in CM(E)-I/G pumps) or Aramide fibres (nbr) (only in CM(E)-A pumps)
• Discharge part: Cast iron (only in CM(E)-A pumps)
• Inlet part: Cast iron (only in CM(E)-A pumps)
• Chamber: Stainless steel 1.4301/AISI 304 or 1.4401/AISI 316 (1.4401/AISI 316 for CME-G)
• Plug: Stainless steel 1.4404/AISI 316L
• Impeller: Stainless steel 1.4301/AISI 304 or 1.4401/AISI 316 (1.4401/AISI 316 for CME-G). Specific models (e.g., CM(E) 1-9 to 1-14) are fitted with 1.4401 impellers as standard.
• Spacing pipe: Stainless steel 1.4401/AISI 316
• Clamp: Stainless steel STX2000 (~ CrNiMO 22 19 4)
• Flange: Cast iron (only in CM(E)-I/G pumps)
• Sleeve: Stainless steel 1.4301/AISI 304 or 1.4401/AISI 316 (1.4401/AISI 316 for CME-G)
• Nut: Stainless steel A4
• Washer (NORD-LOCK®): Steel 1.4547

Dimensions and Connections

Pipe connections include Rp 1, Rp 3/8, and NPT 1.

See the official PDF for exact tabulated dimensions (A1-A4, B1-B3, H, H1, H2, L1-L9) in mm for specific pump types and variants.

Weights and Shipping Volume

Example weights for CME 3-A (1 x 200-240 V, 50/60 Hz):

• CME 3-2: Net weight 14.4 kg, Gross weight 17.9 kg, Shipping volume 0.0296 m³
• CME 3-3: Net weight 17.1 kg, Gross weight 20.6 kg, Shipping volume 0.0370 m³
• CME 3-4: Net weight 17.3 kg, Gross weight 20.8 kg, Shipping volume 0.0370 m³
• CME 3-5: Net weight 17.6 kg, Gross weight 21.1 kg, Shipping volume 0.0370 m³

See the official PDF for exact tabulated net weights, gross weights, and shipping volumes for all CME 1-A, CME 3-A, and CME 5-A models and supply voltages.

Control and Communication

CME pumps can be controlled and monitored via:

• A central building management system.
• A Grundfos R100 remote control (accessory), which uses an IR-signal transmitter.
• A control panel on the CME pump terminal box for manual setpoint adjustments.

Communication with external systems is possible through various Communication Interface Units (CIU):

• CIU 100: LON
• CIU 150: PROFIBUS DP
• CIU 200: Modbus RTU
• CIU 250: GSM
• CIU 270: GRM
• CIU 300: BACnet MS/TP

CME pumps are designed for applications with variable flow, utilizing speed control based on affinity equations to optimize operating economy.

Accessories

All listed sensors provide a 4-20 mA signal output.

Flowmeters (Siemens SITRANS FM MAGFLO MAG 5100 W):

• 1-5 m³ (DN 25)
• 3-10 m³ (DN 40)
• 6-30 m³ (DN 65)
• 20-75 m³ (DN 100)

Temperature Sensors (Carlo Gavazzi TTA, with 1/2 RG connection):

• 0 °C to +25 °C
• -25 °C to +25 °C
• +50 °C to +100 °C
• 0 °C to +150 °C
• Protecting tubes: ∅9 x 50 mm, ∅9 x 100 mm
• Cutting ring bush

Ambient Temperature Sensor (tmg WR 52):

• -50 °C to +50 °C

Differential-Temperature Sensors (Honsberg ETSD):

• 0 °C to +20 °C
• 0 °C to +50 °C

Danfoss Pressure Sensor Kits (MBS 3000):

• Pressure ranges: 0-4 bar, 0-6 bar, 0-10 bar, 0-16 bar, 0-25 bar
• Temperature range: -40 °C to +85 °C
• Connection: G 1/2 A

DPI Differential-Pressure Sensor Kit:

• Pressure ranges: 0-0.6 bar, 0-1.0 bar, 0-1.6 bar, 0-2.5 bar, 0-4.0 bar, 0-6.0 bar, 0-10 bar

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the official OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror