Grundfos Magna1 D 50-120 F 280 Circulator Pump 99221342 #4799 USED

GRUNDFOS MAGNA1 D 50-120 F 280 – Twin-Head Flanged Circulator Pump (99221342) #4799

This listing is for a Grundfos MAGNA1 D twin-head wet-rotor circulator pump. MAGNA1 D combines the high energy efficiency of permanent-magnet synchronous motors with integrated frequency converters and a dual-head configuration, providing flexibility for redundancy or parallel operation in HVAC circulation systems.

The pump uses a maintenance-free canned-rotor design with integrated electronics on each head. Setup and monitoring can be carried out via the onboard interfaces or wirelessly using Grundfos GO Remote.

Condition: supplied as a USED unit. The pump has previously been installed and tested; it may show signs of use consistent with its history.
Guarantee: supplied with our 6-month guarantee.

• Pump type: MAGNA1 D twin-head wet-rotor circulator
• Connection: DN50 flanged (PN6/10)
• Port-to-port length: 280 mm
• Electrical supply: 1 × 230–240 V, 50 / 60 Hz
• Motors: permanent-magnet synchronous (PM)
• Control: integrated frequency converters with user interfaces
• Communication: Grundfos GO Remote compatible

Need help confirming suitability?
Call us on 01803 220416 for technical advice.

Manufacturer product page

Full technical specifications and performance curves can be viewed on the official Grundfos product page:
View Grundfos MAGNA1 D 50-120 F (99221342) – Variant details

Frequently Asked Questions

What does the model number mean?

• MAGNA1 D – high-efficiency variable-speed twin-head wet-rotor circulator
• 50 – nominal connection size (DN50)
• 120 – hydraulic performance series / head class
• F – flanged connection version
• 280 – port-to-port installation length in millimetres

Why choose a MAGNA1 instead of a MAGNA3?

The MAGNA1 range is ideal for users who need efficient circulators without complex BMS features. Compared with MAGNA3:

• MAGNA1 offers simpler setup and operation with lower cost
• Ideal where only basic control and redundancy are required
• Still provides substantial energy savings via PM motors and integrated drives
• Includes fault relays and digital start/stop inputs

Choose MAGNA3 when you need advanced flow/energy monitoring, full building management communication (BACnet/LON), or multi-pump cascade control with advanced logic. For straightforward HVAC circulation with basic variable-speed control, MAGNA1 is usually the better value choice.

What’s the difference between MAGNA1 and MAGNA1 D?

MAGNA1 is a single-head circulator. MAGNA1 D features two independent pump heads on one common base, allowing redundancy or parallel flow installations.

Is the pump maintenance-free?

Yes. The wet-rotor canned design has no mechanical shaft seal, resulting in very low maintenance and quiet operation.

Can this replace older fixed-speed pumps?

Yes — subject to hydraulic and connection match. The variable-speed electronics in a MAGNA1 D can deliver significant energy savings compared with traditional fixed-speed circulators, but system duty and connection type should be confirmed before replacement.

About Our Stock

Stock code: #4799
We specialise in supplying quality pumps and equipment. This used unit is inspected prior to dispatch and supplied with a 6-month guarantee.