Details
The Laing DDC-1RT Plus (part number 6500053) is the 18 W DDC pump with threaded connections: instead of hose barbs it has two 1/4" male threads, so you can screw on fittings of your choice. Like every DDC it uses an electronically commutated spherical motor and is only 38 mm tall; power comes from a 4-pin Molex plug, the speed signal from a 3-pin fan cable.
Properties
- Model
- DDC-1RT Plus, part number 6500053
- Max. head
- 4.7 m at 12 V
- Max. flow
- 600 L/h
- Power consumption
- 18 W
- Connections
- 2x 1/4" male thread
- Power connector
- 4-pin Molex, plus 3-pin fan cable for the speed signal
The first pump for water-cooled workstations
Xylem calls the DDC the first pump to be used in mass-produced, water-cooled workstations. Its small size and output make it a good fit for cooling processors and other electronics, in custom loops, AIO coolers and server cooling.
Threaded connections
The R in the name stands for the threaded version. Xylem's drawing shows the two connections as 1/4" R male threads, which take female fittings in place of the hose barbs of the DDC-1T models. Pumping performance is that of the DDC-1T Plus.
The spherical motor
The DDC is driven by an electronically commutated spherical motor. Its only moving part is the spherically shaped rotor and impeller unit, which sits on an ultra-hard, wear-resistant ceramic ball; there is no conventional shaft, shaft bearing or shaft seal. Xylem says bearing play, and the noise that comes with it, cannot develop, so the pump stays quiet over its whole service life. The bearing realigns itself and is lubricated by the coolant (wet rotor design), so the pump needs no maintenance.
Reliable and compact
The rotor is held in place magnetically, so small dirt particles are no problem, the rotor cannot lock under normal conditions and the pump starts reliably even after a long standstill. Because the stator wraps all the way around the rotor, the whole pump is only 38 mm tall and fits standard PC cases; separate magnetic shielding is normally not needed. Xylem expects a service life of well over 50,000 hours at 12 V, and every part in contact with the coolant is corrosion resistant.
Speed control and monitoring
Changing the supply voltage is a simple way to control the speed of the DDC over a wide output range. The tachometer output can be connected to a fan header on the motherboard or a fan controller to monitor the pump speed.
Keep the electronics dry
The electronics of the pump are not waterproof (IP32 in the standard version). Make sure no coolant reaches them when you install or service the pump. When you change the top, check that the O-ring seal sits properly, and avoid spills while filling the loop. Never run the pump dry; the coolant lubricates the bearing.
Technical data
| Model | Laing DDC-1RT Plus, part number 6500053 |
| Max. head at 12 V | 4.7 m |
| Max. flow | 600 L/h |
| Power consumption | 18 W |
| Motor | Electronically commutated spherical motor |
| Nominal voltage | 12 V DC |
| Max. system pressure | 1.5 bar (150 kPa) |
| Wetted parts | Stainless steel 1.4571, PPS GF40, EPDM gasket, aluminum oxide |
| Connections | 2x 1/4" R male thread |
| Power connector | 4-pin Molex for DC in, 3-pin fan cable for the speed signal |
| Footprint | 62 x 62 mm |
Notes
- The DDC is the pump originally designed by Laing; Xylem sells it today under its Flojet brand.
In the box
- 1x Laing DDC-1RT Plus pump
Xylem's DDC technical drawing is a PDF.
