Installation; Mounting; Open-Ended System With Direct Water Supply - Danfoss APP series User Manual

Data sheet

13. Installation

APP 16-22
Pump A (mm) B (mm)
(P) (HD)
APP 16 450 560
APP 17 450 560
APP 19 550 615
APP 22 550 680
Note: Examples of different pump/motor sizes
and drawing dimensions are only for IEC
motors and couplings. Please always check
required motor power and dimensions.

13.1 Mounting

The figure below illustrates how to mount the
pump and connect it to the electric motor/
combustion engine.
If alternative mounting is required, please
contact Danfoss RO Sales Organization for
further information.
Ensure 3-5 mm (0.12-0.2 inches) air gap
between coupling parts.
A: Flexible coupling
B: Bell housing
C: Motor shaft
13.2 Open-ended system with direct water
supply
In order to eliminate the risk of cavitation, a
positive inlet pressure is always to be maintained.
Please see technical data (section 3.) for specific
pressure values.
1. Place the filter (1) in the water supply line in
front of the pump.
2. Place a monitoring pressure switch (2) - set
at min. inlet pressure - between filter and
pump inlet.
The monitoring switch must stop the pump
at pressures lower than min. inlet pressure.
Please see technical data (section 3.) for
specific pressure values
3. Install a low pressure safety valve or a
pressure relief valve (3) in order to avoid
system or pump damage in case the pump
stops momentarilly or spinning backwards.
180R9265 / IOM APP 16-22 Appendices - v02 / 01.2013
C (mm) D (mm) E (mm)
(H) (A) (B)
225 356 286
225 356 311
250 406 349
280 457 368
To ensure easy mounting of the flexible coupling
without using tools, the tolerances must be
dimensioned accordingly.
Note: Any axial and radial loads on the pump
shaft must be avoided.
Note: If a non return valve is mounted in the
inlet line, a low pressure relief valve is also
required between non return valve and pump
as protection against high pressure peaks.
F (mm) G (mm) IEC Electric motor
(LB)
675 262 37 kW, IEC 225 S4
705 262 45 kW, IEC 225 M4
775 265 55 kW, IEC 250 M4
835 265 75 kW, IEC 280 S4
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