Miele Rotary Ironer PRI 421 [EL SOM LAM IB RF] – 3N AC 400V 50-60HZ, Iron grey

A 365 mm roller working across a 2040 mm width puts the Miele PRI 421 firmly in the large-flatwork class. At 25 % residual moisture it is rated for up to 113 kg/h, and even at 50 % residual moisture the specification gives 67 kg/h, so it suits laundries where sheets and table linen arrive in continuous batches rather than sporadic small loads.

On a vessel, those throughput figures have to be weighed against power, heat and deck loading. The PRI 421 connects on a 3N AC 400V 50–60HZ supply with a total connected load of 23.5 kW and an electric heater rating of 22.9 kW, protected by a 50 A fuse rating. Heat dissipation into the room is specified at 13.7 MJ/h, a figure the HVAC engineer needs for the laundry ventilation design. Net weight is 458 kg with a maximum floor load of 4493 N, so the location and the deck structure should be checked early with the yard.

External dimensions are 1110 mm in height, 2759 mm in width and 1441 mm in depth. Gross transport dimensions of 1388 x 2866 x 1096 mm matter at the shipyard stage where access routes and door clearances are tight. The construction type is laundry infeed at the front and laundry outfeed at the back, which calls for a two-sided workflow with safe access along both long faces of the machine. In a narrow laundry where only one working side is possible, that layout quickly becomes the limiting factor.

The ironing surface combines leaf-spring padding with an ARAMID needle-felt cloth ironer cover on the 365 mm roller. Across the 2040 mm working width that padding and cover combination is specified to give consistent contact pressure, which is what allows the operator to use the upper end of the controlled ironing speed range without fighting creases. Ironing speed is adjustable between a minimum of 1.5 m/min and a maximum of 5.4 m/min, so feed can be matched to actual residual moisture, staffing and finishing standards rather than running only at nameplate capacity.

The PRI 421 sits in the Miele Professional range and is specified and approved for shipboard use as well as for offshore installations. Emission sound pressure level at the workplace is quoted as 56 dB(A) re 20 µPa, which is relevant where the ironer shares space with folding or quality control. Tested operating hours of 20000 indicate a design aimed at long-duty applications rather than occasional use. A stated recycling rate of 98 % can be factored into fleet-wide end-of-life planning when equipment replacement cycles are drawn up.

Build and control

• Laundry infeed at the front, laundry outfeed at the back
• 365 mm roller diameter with 2040 mm working width
• Leaf-spring padding with ARAMID needle-felt cloth ironer cover
• Touch display control system
• Programme setting with defined programme parameters
• Electric heating with 22.9 kW heater rating and 23.5 kW total connected load
• Electrical connection 3N AC 400V 50–60HZ with 50 A fuse rating
• Specified for offshore installations and approved for shipboard use
• Can be tied into a peak-load / energy management system

This ironer is the right choice where the laundry can support two-sided operation, where flatwork volumes approach the 113 kg/h class at 25 % residual moisture, and where a 3N AC 400V 50–60HZ, 23.5 kW supply with 50 A protection is available. It is the wrong choice for small crew laundries with modest flatwork, for spaces that cannot provide access to both front and rear within its 2759 x 1441 mm footprint, or where the deck structure or HVAC system cannot accommodate a 4493 N floor load and 13.7 MJ/h of room heat. Ordered under Miele material number 11606170 and article number 53421109SOM.