Installation and instruction manual for Laing DDC pumps

Installation and instruction manual for Laing DDC pumps
Installation and instruction manual for
Laing DDC pumps
Installation and instruction manual Laing DDC pumps
The Laing DDC series pumps are primarily used for the circulation of cooling
liquid in liquid cooled computers.
- The Laing DDC pumps are spherical motor pumps, which provide very
quiet operation and long life.
- The motor is electronically commutated and the pumps consequently
have a high efficiency.
- The electronic commutation creates a sine wave voltage, practically
eliminating commutation noises.
- The DDC pump is supplied with mounting feet and either 3/8“ hose barb
(models DDC-1, DDC-1 P and DDC1- T)or 1/4’“ male thread connections
(models DDC-1 R, DDC-1 RP and DDC1- RT)
- DDC-1: Pump with lead wire, no connector.
- DDC-1P: Pump with hard disk power connector.
- DDC-1T: Pump with hard disk power connector for power and an
additional fan connector for the tacho output. If this connector is plugged
into a fan receptacle on the motherboard, the rpm of the pump can be
monitored in the BIOS.
Expansion tank
- The pump is ideally in
stalled in the cooling loop
Heat exchanger
before the air cooled heat
Cold Plate
exchanger. In this way, the
waste heat of the pump
itself is added to the
cooling loop downstream
of the CPU
- An expansion tank needs
to be mounted on the
suction side of the pump. The expansion tank must be sized such that
there is always sufficient liquid in the system.
Installation and instruction manual Laing DDC pumps
- The pump must be mounted below the level of an open expansion tank.
- Ideally the pump should be placed at the lowest point of the system.
- The pump is mounted on a flat surface. Avoid bending the
pump by over tightening of
the screws.
Drilling dimensions for the mounting holes
Installation position
The pump can be mounted either to a wall or on the bottom of the computer.
The pump must not be mounted with the motor pointing up and it must not
be installed pumping downwards.
Installation and instruction manual Laing DDC pumps
Electrical connection
− The DDC pump runs on 12 Volt DC. If you install a pump without
connector, make sure to observe the correct polarity.
− DDC-1P and DDC-1T are equipped with a connector for the power
− The fan connector of the DDC-1T can be plugged into a fan receptacle
on the motherboard to enable monitoring of the pump rpm.
− The cooling loop must be fully operational before starting the computer
because the CPU otherwise can overheat in a very short time and can
suffer damage.
− Before starting up the pump make sure that the loop is completely filled.
− Start the pump
− If you can hear an audible noise, air is left in the pump. Switching the pump on and off several times can accelerate the purging of this air.
Disconnect the power plug and reconnect it after approx. 2 seconds.
− While purging the air observe the liquid level in the expansion tank. If
the liquid in the expansion tank is exhausted, air will be sucked back
into the loop continuously.
− If the system does not run quiet after several minutes of purging stop
the pump and re-fill the system.
− Avoid running the pump dry for prolonged periods since this will damage the bearing.
Installation and instruction manual Laing DDC pumps
− The pump does not require any maintenance. There are no user
replaceable parts in the pump.
− It is important for trouble free operation of the pump that there is always
enough liquid in the pump, since dry run damages the bearing and leads
to reduced flow or interruption of the pumping operation.
− Air in the system will cause audible noise and therefore can be easily
− If there are foreign particles or deposits in the system, please follow the
instructions listed in the troubleshooting section.
− If the pump does not operate,
please check first whether the
power supply is operating
− If this does not resolve the
problem please unplug the
pump several times.
− If this still does not result in
the pump starting, it is
probably blocked by particles
or deposits in the system.
− Drain the system and remove
the pump.
− Open the pump by removing
the four housing screws at
the bottom.
− Remove the pump housing and
pull out the rotor.
− Clean the rotor and the stator
with a clean cloth and purge
all dirt from the pump housing.
Seal ring
Installation and instruction manual Laing DDC pumps
After reinserting the rotor into the stator perform a brief run test to make
sure that the rotor is spinning up. Caution: To avoid the introduction of
water into the electronics the pump should be completely dry before this
test is done.
If the rotor is spinning in the above test, remove the o-ring from its seat
and clean it carefully.
Re-insert the seal ring, place the pump housing on top of the motor and screw it in place using the four screws.
If the pump still won’t work or if the rotor does not run during the run test the pump needs to be replaced.
Dimensional drawing (in mm)
Installation and instruction manual Laing DDC pumps
Pump head [m]
Power consumption [W]
Pump curve
Flow rate [l/h]
About us
Since the 1950s we at Laing have worked in the areas of research,
development and production of pumps and heating products. The original
R&D institute located in Southern Germany has over the years evolved into
an international company with additional locations in the US, Japan and
Hungary and with more than 400 employees.
Today, our program consists of:
Pumps (Shaftless spherical motor pumps) Heating controls
Floor heating system connection Electrical heaters
Special products
Laing GmbH · Systeme für Wärmetechnik
Klingelbrunnenweg 4 · 71686 Remseck · Germany Phone: +49(0) 7146/93-0
Fax: +49(0) 7146/93-33 · E-Mail: · Internet:
261007 Subject to change withot notice
We are a flexible and competent partner in the area of pumping and
heating. We invite you to try our high quality, economic products.
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