Danfoss APP 53, APP 65, APP 78, APP 86, APP 92 Installation guide

Instruction

APP Pump Instruction APP 53 / APP 65 / APP 78 / APP 86 / APP 92

hpp.danfoss.com

Instruction | APP Pump Instruction APP 53-92

Table of Contents

1. Identication ...........................................................................2

2. System design ..........................................................................3

2.1 Open-ended systems with direct water supply...........................................3

2.2

Preferred RO system design without ERD ..................................................3

2.3 Preferred RO system design with ERD....................................................4

2.4 Preferred RO system design with pumps and ERDs in parallel.............................4

2.5 Reversible pumps .......................................................................4

3. Building up the pump unit with BoWex coupling.........................................4

3.1 Assembly of the coupling ...............................................................4

3.2 Alignment between the motor and pump shaft..........................................4

3.3 Overall assembly with coupling BoWex-ELASTIC®, type HEW compact ....................5

3.3.1 Mounting ...............................................................................6

3.4 Direction of rotation ....................................................................7

3.5 Orientation .............................................................................7

3.6 Protection from too high pressures ......................................................7

4. Building up the pump unit with jaw coupling ............................................7

4.1 Mounting...............................................................................7

4.2 Connections ............................................................................8

5. Initial start-up ...........................................................................9

6. Operation..............................................................................10

6.1 Temperature...........................................................................10

6.2 Pressure ...............................................................................10

6.3 Dry running............................................................................10

6.4 Disconnection .........................................................................10

6.5 Storage ................................................................................11

1. Identication

7. Service and warranty...................................................................11

PUMP

Type APP 78 Code no. 180BXXXX

Serial no. XXXXXX08-XXX

MADE IN DENMARK

Danfoss A/S, 6430 Nordborg, Denmark

2 | © Danfoss | DCS (im) | 2021.05 AN220686503013en-000901 | 180R9368 | 521B1392

Instruction | APP Pump Instruction APP 53-92

2. System design

The design of the system must ensure that self-emptying of the pump during standstill is avoided.

The inlet pressure of the pump must never exceed the outlet pressure. This may typically occur in boosted or open-ended systems with direct water supply.

2.1 Open-ended systems with direct water supply

Axial piston pumps require a certain inlet pressure to perform as intended. Please nd min. required feed pressure in the pump data sheet. Please also note that feed pressure must not exceed 5 barg (72.5 psig).

2.2

Preferred RO system design without ERD

1. Dimension the inlet line to obtain minimum pressure loss (large ow, minimum pipe length, minimum number of bends/ connections, and ttings with small pressure losses).

2. Place an inlet lter (1) in front of the APP pump (2). Please consult Danfoss lter data sheet for guidance on how to select the right lter. Thoroughly clean pipes and ush system prior to start-up.

3. Place a monitoring pressure switch (3) set at min. inlet pressure between lter and pump inlet. The monitoring switch must stop the pump at pressures lower than minimum pressure.

4. Use exible hoses (4) to minimize vibrations and noise.

5. In order to eliminate the risk of damage and cavitation, a positive pressure at the inlet (5) is always to be maintained at min. inlet pressure and max. inlet pressure.

To protect the pump from being damaged by peaks of high-pressure in case the pump stops momentarily, it is required to mount a lowpressure relief valve on the inlet line.

Note: The inlet connection must be properly tightened, as possible entrance of air will cause cavitation.

It is recommend to install safety valve or a pressure relief valve (9) in order to avoid high-pressure peaks in case the pump stops momentarilly or is spinning backwards.

6. For easy system bleeding and ushing, a bypass non-return valve (6) is integrated in the APP pump.

7. A non-return valve (7) in outlet can be installed in order to avoid backspin of the pump. The volume of water in the membrane vessel works as an accumulator and will send ow backwards in case of the pump stops momentarily.

8. A safety valve or a pressure relief valve (8) can be installed in order to avoid system damage as the Danfoss APP pump creates pressure and ow immediately after startup, regardless of any counter pressure.

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.

Feed

Media filter

PI PI

Fresh water

permeat flush

Brine

Permeate

Instruction | APP Pump Instruction APP 53-92

2.3 Preferred RO system design with ERD

For P&ID of a setup with an iSave, please see the iSave® Data sheet 521B1378

2.4 Preferred RO system design with pumps and ERDs in parallel

For systems with Danfoss pumps and ERDs in parallel, please see our publication 180R9354, Guideline for Parallel-coupled pumps and ERD.

2.5 Reversible pumps

If exposed to high-pressure in the outlet while the electric motor is not energized, the pumps may start spinning backwards. This will not harm the pumps as long as the pressure in the inlet does not exceed the max. pressure peak of 10 barg(145 psig).

If a non-return valve is mounted in the inlet line, a low-pressure relief valve is required as protection against high-pressure pulses and high-pressure in general.

Alternatively a high-pressure check valve can be mounted in the pump discharge line to prevent the pump from reversing.

The setup of “open-end system” ensures that the inlet pressure does not exceed 10 barg (145 psig), when a nonreturn valve is mounted in the inlet.

2.6 General comments

A good ltration is vital to ensure a long and trouble-free life of the pump.

As water has very low viscosity, the APP pumps have been designed with very narrow clearance in order to control internal leakage rates and improve component performance. Therefore it is important that the inlet water is ltered properly to minimize the wear of the pump.

The main lter must have a ltration eciency of

99.98% at 10 μm. We recommend to use precision depth lter cartridges rated 10 μm abs. β10 ≥ 5000 (equivalent to a ltration eciency of

99.98%). Bag lters and string wounded lter cartridges typically have only 50% ltration eciency. This means that for each 100,000 particles reaching the lter, 50,000 particles pass through it compared to only 20 particles in a lter with an eciency of 99.98%.

For more information on the importance of proper ltration, please see our data sheet 521B1009 on “Filtration”, which also will provide you with an explanation of ltration denitions and a guidance on how to select the right lter.

Monitoring

It is recommended to continuously monitor the following conditions:

• Filter clogging

• Pressure (inlet- and outlet side of the pump)

3. Building up the pump unit with BoWex coupling

3.1 Assembly of the coupling

We recommend to inspect bores, shaft, keyway and feather key for dimensional accuracy before assembly.

Heating the hubs lightly (approx. 80 °C) allows for an easier mounting on the shaft.

Please pay attention to the ignition risk in potentially explosive atmospheres!

3.2 Alignment between the motor and pump shaft

Touching the heated hubs causes burns. Please wear safety gloves.

With the assembly please make sure that the spline of the hub is fully covered by the internal spline of elastomer (please observe mounting dimensions L may cause damage to the coupling.

). Disregarding this advice

coupling

max. 0. 5 mm

max. 0.02 in ch

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