Grundfos UMC/D 80-60 Circulator Replacement Pump Head 415V 96406336 #5008

Grundfos UMC/D 80-60 Circulator Replacement Pump Head 415V 96406336 #5008

This listing is for a genuine Grundfos UMC/D 80-60 replacement circulator pump head, part number 96406336. Designed for compatible UMC 80-60 single-head and UMCD 80-60 twin-head commercial circulator pumps, it provides a practical way to repair an existing installation without replacing the complete pump.

UMS compatibility: Grundfos' historical replacement-parts documentation also identifies UMC heads and terminal boxes as replacements for the corresponding UMS range. This includes compatible UMS 80-60 installations, subject to the correct head/body interface, voltage and terminal box arrangement.

Important: This listing is for the replacement pump head, not the complete pump. The existing pump body, flanges and pipework are retained. Please refer to the product photographs for the components supplied.

Condition: As-new surplus condition. Unused, although minor cosmetic marks from storage and handling may be present. Supplied with a 2-year guarantee.

Technical Specifications

• Manufacturer: Grundfos
• Part type: Replacement circulator pump head
• Model: UMC/D 80-60
• Grundfos part number: 96406336
• Stock code: #5008
• Compatible pump models: UMC 80-60 / UMCD 80-60
• Additional compatibility: Corresponding UMS 80-60 installations, subject to verification
• Electrical supply: 3 × 415V, 50Hz, three-phase
• Motor type: 4-pole, three-speed circulator motor
• Pump construction: Glandless wet-rotor circulator
• Nominal pump size: DN80
• Maximum head class: Approximately 6 metres
• Speed 1: 610 rpm / 245W input / 0.46A
• Speed 2: 1050 rpm / 575W input / 1.03A
• Speed 3: 1380 rpm / 950W input / 2.14A
• Speed selection: Three-speed operation using the appropriate original terminal box arrangement
• Typical application: Commercial heating and HVAC water circulation
• Availability: Legacy Grundfos replacement part, now obsolete through normal manufacturer supply channels

Electrical data: Figures are taken from the original Grundfos UMC/UPC technical literature for the UMC 80-60 at 415V. Confirm the existing pump nameplate and electrical installation before replacement.

Need help confirming compatibility?
Call us on 01803 220416 or send photographs of your existing pump nameplate, motor head and terminal box.

Technical Documentation

Original Grundfos UMC/UPC in-line circulator technical brochure, including performance curves, electrical specifications, dimensions and installation information:

View Grundfos UMC/UPC Technical Brochure

Typical Applications

• Replacement head for Grundfos UMC 80-60 circulators
• Replacement head for Grundfos UMCD 80-60 twin-head circulators
• Replacement of compatible Grundfos UMS 80-60 heads
• Commercial heating and boiler circulation systems
• HVAC and closed-loop heating-water circulation
• Maintaining older three-phase installations without unnecessary pipework or electrical alterations

Frequently Asked Questions

Does this head fit both UMC and UMCD pumps?

Yes. Grundfos part number 96406336 is identified for the UMC 80-60 single-head and UMCD 80-60 twin-head pump ranges. On a compatible twin-head installation, the individual motor/head assembly can be replaced while retaining the existing shared pump body.

Will this replacement head fit a Grundfos UMS pump?

Yes, subject to matching the installation. Grundfos' historical replacement-parts documentation specifies the use of UMC replacement heads and terminal boxes for UMS pumps.

This means compatible UMS 80-60 installations may be repaired using the corresponding UMC replacement components. The existing pump model, voltage, head mounting arrangement and terminal box must be checked before ordering. Not every UMS installation should be assumed interchangeable without inspection.

Why replace the head instead of fitting a modern high-efficiency circulator?

One of the biggest advantages is retaining the existing 415V three-phase electrical supply.

Many modern electronically controlled commercial circulators use 230V single-phase power. Replacing an older three-phase pump with one of these models can require alterations to the electrical supply, motor protection, controls and associated wiring.

Using the correct original-style replacement head can avoid these alterations, allowing the existing three-phase installation to be retained where the wiring and controls remain suitable.

There are also potential mechanical advantages. Replacing the head allows the existing pump body, flanges and pipework to remain in position, avoiding unnecessary modifications to a functioning installation.

Modern high-efficiency pumps can offer significant energy savings, but a complete replacement should be assessed for electrical compatibility, hydraulic performance, installation dimensions and control requirements.

What about NPSH and minimum inlet pressure?

When selecting a modern replacement circulator, the minimum inlet pressure and Net Positive Suction Head (NPSH) requirements must be considered.

Different pump designs may have different inlet-pressure requirements. Insufficient inlet pressure, particularly when circulating hot water, can lead to cavitation, noise and premature component wear.

Retaining the correct original-style replacement head keeps the installation closer to its existing hydraulic design and avoids introducing a different pump with potentially different inlet-pressure requirements.

However, both original and modern circulators require adequate inlet pressure. System pressure, operating temperature and hydraulic conditions should always be checked.

What does UMC 80-60 mean?

UMC identifies the Grundfos four-pole, three-speed circulator range. The 80 refers to the nominal DN80 pump connection size, while 60 represents a nominal shut-off head of 60 kPa, approximately 6 metres.

UMCD refers to the corresponding twin-head pump arrangement.

Is this a three-speed pump head?

Yes. The UMC 80-60 was designed with three selectable operating speeds, allowing the pump performance to be adjusted to suit the installation.

The original Grundfos electrical data specifies approximately 610, 1050 and 1380 rpm, with maximum-speed electrical input of 950W per head.

Speed selection depends on the appropriate terminal box and electrical arrangement.

Should the terminal box be replaced?

Grundfos distributor guidance recommends replacing the terminal box when installing a replacement head. This is particularly important where the existing terminal box shows signs of age, overheating, water damage or electrical deterioration.

For older UMS installations, the historical Grundfos replacement guidance specifically refers to using both the corresponding UMC head and terminal box.

Please check the listing photographs to confirm whether a terminal box is supplied. If you are unsure which components are required, contact us before ordering.

Does this pump head have a mechanical shaft seal?

No. The UMC is a glandless wet-rotor circulator and does not use a conventional mechanical shaft seal like a dry-rotor centrifugal pump.

The pumped liquid provides lubrication and cooling for the rotor and bearing arrangement. The pump must therefore be correctly filled and vented before operation and must not be run dry.

What liquids can this pump circulate?

The UMC range is primarily intended for clean heating and HVAC circulation water in compatible systems.

It is not suitable for sewage, sludge, heavily contaminated water or liquids containing abrasive solids and fibres. Poor water quality can damage the rotor and bearings.

For glycol mixtures, chemical additives or unusual operating temperatures, compatibility must be checked against the complete pump specification and system conditions.

Is this replacement head obsolete?

Yes. The Grundfos UMC/UPC replacement head range has been discontinued through normal manufacturer supply channels, making genuine replacement heads increasingly difficult to source.

For installations where the existing pump body and pipework remain serviceable, an original replacement head offers an alternative to changing the entire circulator.

What should I check before ordering?

• Existing pump model: UMC 80-60, UMCD 80-60 or compatible UMS 80-60
• Replacement part number: 96406336
• Electrical supply: 415V three-phase, 50Hz
• Head mounting arrangement and pump body compatibility
• Terminal box compatibility and components supplied
• Condition of the existing pump body and system water
• Existing control and electrical protection arrangements

About Our Stock

Stock code: #5008

We specialise in supplying new and unused surplus commercial pumps, circulators and replacement pump heads, including genuine obsolete equipment that can be difficult to obtain through traditional distributors.

This item is supplied in as-new surplus condition with a 2-year guarantee. Minor cosmetic marks from storage or handling may be present.

Please confirm compatibility before purchasing. Our team can assist with identifying older Grundfos pumps and replacement heads.