Installing The Unit - Bühler technologies BNK Notice De Montage

BNK
WARNING
Crushing hazard
Crushing hazard during equipment transport and set-up.
Use the correct hoisting gear to prevent injuries during hoist-
ing.
Be sure the hoisting gear is free from defects and approved
for the weight of the device.
Ensure secure fastening and mooring when transporting.
4 Installation and connection
4.1 Requirements to the installation site
Aggregate
The aggregate must be set up to allow for unobstructed air
flow and adequate room for maintenance/repairs. When in-
stalled outdoors, be sure to consider the motor protection rat-
ing (standard: IP 55) and ensure adequate protection from the
weather.
Air cooler
The aggregate must be set up to allow for unobstructed air
flow and adequate room for maintenance/repairs.
The cooler must be located in such a way that the air flowing
through the matrix has free flow on entry and exit. The dis-
tance between air intake or air outlet to the nearest surround-
ing obstacle should be at minimum half the height of the
matrix. Free air flow must be provided.If the cooler is to be
sited near to working personnel, the effect of hot draught and
noise emissions must be taken into account.
If the cooler is installed in closed space, ensure sufficient air
circulation. Avoid back flow of warmed air. If necessary, the
room must be vented.
Due to lower temperatures with respect to closed rooms, the
cooling capacity outside raises, but on the other hand higher
start up pressure may result due to higher oil viscosity. In this
case, consider a bypass valve and / or a heating.
The rotating fan might lead to static charging. Therefore sens-
itive equipment like electronics should be kept away from the
device.

4.2 Installing the unit

The units are screwed in place at the attachment points using
screws. Be sure the support structure is sized adequately. To
protect the system from damage, the connections must be
stress free. We recommend using flexible hoses. Be sure the
hose is stable against negative pressure, e.g. steel wire rein-
forced. Avoid possible leaks in the circuit to prevent environ-
mental damages. If necessary, use an oil pan. Protect the ag-
gregate from mechanical impact.
4.2.1 Additional advices for units with pump
The distance from the unit to the reservoir should be as short
as possible. Especially the suction pipe should be short and of
sufficient inner diameter.
We suggest mounting the unit in the same height as the li-
quid level. Mounting below the liquid level is possible as well.
BX360001 ◦ 10/2021
If the aggregate can only be installed above this level, the
pump will have a constant suction pressure of 0.4 bar (atmo-
sphere). Depending on the oil viscosity and temperature, this
will result in a different suction lift. A difference in value of
2 m can be used as a guide.
Until the oil is heated to operating temperature, a suction
pressure of 0.6 bar is permissible temporarily.
The diameter of the intake pipe should not be smaller than
specified in the data sheet. We recommend a max. flow speed
of 1.5 m/s.
When first starting up a hydraulic system with a long intake
pipe can cause problems due to excess air in the intake pipe.
In this case we suggest filling the suction pipe with oil and us-
ing a suction valve without spring.
Oil is sprayed into the pump housing during the assembly
process at our factory. This is necessary to seal the gerotor
from the housing with an oil film. During extended periods of
storage the pump housing may not have enough oil anymore
to create this oil film when switching on the pump. The pump
may then completely lose suction. Before connecting the suc-
tion pipe we recommend spraying some oil into the pump
housing to prevent this.
The pump may be exposed to max. 0.5 bar of pressure on the
suction side.
4.2.2 Installing swivel nuts in the fitting body
Proceed as follows:
• Carefully slide the preinstalled pipe end into the 24° cone
on the fitting body.
• Tighten the swivel nut until a considerable increase in
force can be felt (fixed point).
• Use a suitable spanner to tighten the swivel nut a 1/12
turn more (30°) beyond the fixed point. A marker line on
the swivel nut and the fitting body facilitates observing
the correct tightening angle.
Tube Thread Torque (Nm) for
A.D. straight screwed
6 G 1/8"
8 G 1/4"
10 G 1/4"
12 G 3/8"
15 G 1/2"
18 G 1/2"
22 G 3/4"
28 G 1"
35 G 1 1/4"
42 G 1 1/2"
Torque (Nm) sealing
plug
plug
18 13
35 30
35 30
70 60
90 80
90 80
180 140
310 200
450 400
540 450
Bühler Technologies GmbH 7