Grundfos UPC UPCD 50-120 F Circulator Pump Head 240V 55533223 #4875

Grundfos UPC / UPCD 50-120 F Replacement Pump Head – 240V Circulator Head (55533223 / 96406328) #4875

This listing is for a Grundfos UPC / UPCD 50-120 F replacement pump head, marked with part number 55533223. The later replacement head reference for this UPC 50-120 240V single-phase head is commonly cited as 96406328. It is intended for compatible Grundfos UPC / UPCD 50-120 F circulator pump bodies where the motor head, hydraulic unit, voltage and body interface match the existing installation.

Condition: supplied in as new surplus condition – the unit has not been installed or used but may show minor cosmetic markings from storage and handling. Guarantee: supplied with a 2-year guarantee.

• Part type: replacement circulator pump head / motor head
• Part number on item: 55533223
• Later / replacement reference: 96406328
• Model reference: UPC / UPCD 50-120 F
• Electrical supply: 230–240 V, 1-phase, 50 Hz
• Pump style: glandless wet-rotor circulator head
• Use: replacement head for compatible UPC / UPCD 50-120 F pump assemblies
• Important: pump body, flanges and pipework connections are not included

Need help confirming compatibility?
Call us on 01803 220416 for technical advice before ordering.

Compatibility guidance

This is a replacement pump head only, not a complete circulator pump. It should be selected by matching the existing Grundfos model, head part number, voltage, hydraulic size and pump body interface.

• Check the existing pump is a compatible UPC / UPCD 50-120 F assembly
• Confirm the existing head or motor label is 230–240 V single-phase
• Confirm the replacement head interface matches the installed pump body
• Check whether the existing unit is single-head UPC or twin-head UPCD
• If unsure, send us photos of the existing pump nameplate, head label and pump body

Reference body details

For reference, UPC 50-120 F pump bodies are commonly associated with DN50 flanged pipework and a 280 mm port-to-port length. This listing is for the head only, so the existing pump body, flanges and pipework are retained.

Typical applications

• Replacement head for existing UPC / UPCD 50-120 F installations
• Heating circulation systems
• Commercial building-services circulation
• Plant-room pump repairs where the existing pump body remains installed
• Like-for-like repair where pipework changes are not required

Frequently Asked Questions

Is this a complete pump?

No. This listing is for the replacement pump head / motor head only. It does not include the pump body, flanges or pipework connections.

What is the relationship between 55533223 and 96406328?

The head supplied is marked with part number 55533223. The reference 96406328 is commonly listed as the later Grundfos replacement head number for UPC 50-120 240V single-phase pump heads. When replacing an existing head, please compare the full head label, voltage and pump body interface before ordering.

Will this fit my existing UPC / UPCD 50-120 F pump?

It may fit if your existing pump body is a compatible UPC / UPCD 50-120 F assembly and the head interface, voltage and hydraulic size match. UPC replacement heads are commonly used across compatible single-head UPC and twin-head UPCD pump bodies, but the physical interface and electrical specification must still be checked.

What is the difference between UPC and UPCD?

UPC generally refers to the single-head circulator version, while UPCD refers to the twin-head version. A compatible replacement head may be used on the matching side of a twin-head UPCD pump body, provided the head interface and electrical specification match.

Why replace the pump head instead of the full pump?

Replacing the pump head can be a practical option where the existing pump body, flanges and pipework are still serviceable. It avoids disturbing the pipework, changing flange dimensions or converting the installation to a different pump platform.

Why use an original-style replacement head instead of a modern high-efficiency replacement?

An original-style UPC / UPCD replacement head can suit sites where the existing system was designed around the older UPC / UPS wet-rotor circulator style. If the pump body, hydraulic duty, electrical supply and head interface are correct, replacing the head can be simpler and less disruptive than redesigning the installation around a new high-efficiency circulator.

Older Grundfos catalogue data for the related UPS 50-120 F 280 family gives low minimum inlet-pressure requirements, including 0.05 bar at 75 °C, 0.35 bar at 90 °C and 1.65 bar at 120 °C. This is not a substitute for checking the exact installed pump duty, but any modern replacement should be checked against its own minimum inlet pressure / NPSH requirement before substitution.

Some customers also prefer repairing older Grundfos circulators because the original pump body and installation have already proved reliable on site. Where the existing body is sound, a replacement head can keep the system closer to its original specification.

Does this pump head have a mechanical shaft seal?

No. UPC / UPCD circulators are glandless wet-rotor style pumps, meaning the pump head does not use a conventional mechanical shaft seal like a dry-rotor pump.

Is this a modern high-efficiency circulator?

No. This is an original-style replacement head for compatible UPC / UPCD circulator assemblies. If replacing the full pump with a modern high-efficiency circulator, the pipework dimensions, flange standard, electrical supply, control arrangement and hydraulic duty should all be checked carefully.

Who should install this pump head?

Installation should be carried out by a competent heating engineer or electrician. The pump must be isolated electrically and hydraulically, and the replacement head must be fitted to a compatible pump body using the correct procedure and seals.

About Our Stock

Stock code: #4875
We specialise in supplying new and unused surplus pumps, pump heads and pump spares. All units are inspected prior to dispatch and supplied with a 2-year guarantee.