Danfoss APP 06-10 Pump Pure Aqua Instruction Manual

: June 17, 2024
: Danfoss

Table of Contents

Identiﬁcation
System design
Building up the pump unit
Initial start-up
Operation
Service
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Instruction
APP pump instruction
APP 0.6-1.0, APP 1.5-2.5 and
APP 3.0-3.5 Danfoss APP 06 10 Pump Pure Aqua-

Identiﬁcation

Danfoss APP 06 10 Pump Pure Aqua- Identification

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.
In order to avoid this it is recommended to install a pre-stressed check valve or a pressure switch in the pump inlet.
The opening pressure of the check valve must be bigger or equal to the inlet pressure.

Danfoss APP 06 10 Pump Pure Aqua- tank

2.2 Open-ended systems with direct water supply
The pump is supplied with water direct from a booster pump.
The water pressure must not exceed 5 barg (72.5 psig).

Danfoss APP 06 10 Pump Pure Aqua- water pressure

2.3 Problems with reversing pumps
If exposed to high pressure in the outlet while the electric motor is not energized, the pumps will start spinning backwards. This will not harm the pumps as long as the pressure in the inlet does not exceed the max. pressure of 5 barg.
If a non-return valve is mounted in the inlet line, a low-pressure relief valve will also be required.
Alternatively a high-pressure check valve could be mounted in the pump discharge line to prevent the pump from reversing.
The dotted setup ensures that the inlet pressure does not exceed the 5 barg, when a non- return valve is mounted in the inlet.

2.4 General guidelines for calculation of pressure losses
In order to avoid the risk of cavitation, the inlet pressure at the pump must be in accordance with the specifications mentioned in Data sheet (521 B1331).
The inlet line connection must be properly tightened, as possible entrance of air will cause cavitation.
The suction conditions can be optimized according to below guidelines. Danfoss APP 06 10 Pump Pure Aqua-
calculation

2.5 General comments on
Filtration
A good filtration is vital to ensure a long and trouble free life of the pump.
When selecting a filter or strainer, please note that filter materials should be compatible with water, i.e. should neither corrode or dissolve. Also be aware of the electrochemical series of the applied materials.
Main filter must have a fineness of 10 um abs.
B,, 2 5000. The pressure loss across the filter should be monitored.

Danfoss APP 06 10 Pump Pure Aqua- Monitoring
Water tank
Must be made of corrosion-proof material such as Stainless steel or plastic and must be sealed to prevent entrance of impurities from the environ- ment.
Automatic pressure equalization between tank and surroundings must be ensured.
Inlet from the water supply and inlet to the pump should be placed in opposite ends of the tank to calm and deaerate the water, and to ensure optimum opportunity for particles to settle.
Pump suction line should be placed relatively high above the tank bottom in order to prevent settled particles from being led into the pump.
We recommend a separation (“wall”) to separate the inlet from the outlet end of the tank.
Monitoring
It is recommended to continuously monitor the following conditions:

Water level in the tank
Filter contamination
Pressure (inlet- and outlet side of the pump)

Building up the pump unit

3.1 Mounting
(Please also see hints in “Right and Wrong”)
If alternative mounting is desired, please contact the Danfoss High Pressure Pumps.
Choose proper tolerances to ensure an easy mounting of the elastic coupling without use of tools.
Please take care to observe the recommended length tolerances of the chosen coupling, as an axial force on the pump will damage the pump. Danfoss APP 06
10 Pump Pure Aqua- Motor shaft1

3.2 Direction of rotation

3.3 Orientation
The pump can be mounted/oriented in any horizontal direction. Vertically only with the shaft pointing upwards.

3.4 Protection from too high pressures
The pump should be protected against too high pressure by means of a pressure relief valve or a bypass/unloading valve placed on the pressure side. Danfoss
APP 06 10 Pump Pure Aqua- Pressure

3.5 Connections

Danfoss APP 06 10 Pump Pure Aqua- Connections

| APP 0.6-1.0| APP 1.5-2.5 and APP 3.0-3.5
---|---|---
P| T| C| P| T| C
Thread size| G 1/2 x 15| G 1/2 x 15| M6 Hexagon NV4| G 1/2 x 15| G 3/4 x 17| G 1/4, NV 6
14 deep
Max tighten torque| 25 Nm 18 (lbf ft)| 25 Nm 18 (lbf ft)| 5 Nm
3.5 (lbf ft)| 25 Nm 18 (lbf ft)| 25 Nm 18 (lbf ft)| 15 Nm 11 (lbf ft)

Recommended torque values refer to steel washers containing a rubber sealing element.

Initial start-up

Before start-up, loosen the top bleeding plug “C”.
When water appears from the bleeding plug, retighten the plug. With its inlet line connected to the water supply or the tank, the pump is now started with open outlet port.
At the initial start of the system, the pump should be run without pressure for about 5 minutes, thus removing possible impurities from pipes, hoses, etc. However, the system should be flushed before start-up – without the connected pump.
WARNING:
Make sure that the direction of rotation of the electric motor corresponds to the direction of rotation of the pump. Otherwise the pump will be damaged if a check valve is placed between pump and tank. Danfoss APP 06 10 Pump Pure
Aqua- Bleeding plug

Operation

5.1 Temperature
Fluid temperature:
Min. +2° C to max. +50° C
Min. +35.6° F to max. +122° F
Ambient temperature:
Min. +2° C to max. +50° C
Min. +35.6° F to max. +122° F
In case of lower operating temperatures, please contact Danfoss High Pressure Pumps.
5.2 Pressure
The inlet pressure must be min. 0.5 barg (7.25 psig) and max. 5 barg (72.5 psig). At lower pressures the pump will cavitate, resulting in damage to the pump.
Max. pressure on the pump’s outlet line should be limited at 80 barg (1160 psig) continuously.
Short-term pressure peaks (e.g. in connection with closing of a valve) of up to 100 barg (1450 psig) are acceptable.
NB:
The pump unit should include a pressure gauge on the high pressure side.
5.3 Dry running
When running, the pump must always be connected to the water supply in order to avoid damage if it should run dry.
In systems with water tank it is recommended to build in a level gauge in the tank to avoid the risk of running dry.
5.4 Disconnection
If the inlet line is disconnected from the water supply, the pump will be emptied of water through the disconnected inlet line.
When starting up again, follow the bleeding procedure described under section 4: Initial start up.

5.5 Storage
Storage temperature:
Min. -40° C to max. +70° C
Min. -40° F to max. +158° F
When preparing the pump for long-term storage or for temperatures below the freezing point, flush the pump with an anti-freeze medium type monopropylene glycol to prevent internal corrosion or frost in the pump.
For further information on anti-freeze media, please contact Danfoss High Pressure Pumps.

Recommended procedure:
5.5.1 Open-ended systems with water supply from tank

Empty the tank of water and empty the pump housing through the lower bleeding plug. When the pump is empty, retighten the plug.
Through the upper bleeding plug, fill the pump housing with anti-freeze medium.
Pour anti-freeze medium into the tank.
Connect a hose to the outlet of the pump and lead the other end of the hose back to tank.
Quickly start and stop the pump. Make sure that the pump does not run dry. The pump is now protected against internal corrosion and frost.

5.5.2 Open-ended systems with direct water supply

Disconnect the water supply to the pump.
Through the lower bleeding plug, empty the pump housing of water and close it again.
Connect the pump to a tank of e.g. 25 litre (6 gal.) of anti-freeze additive. Connect a hose to the inlet port of the pump and via another hose return the flow from the outlet port to the tank with anti-freeze additives.
Quickly start and stop the pump. Make sure that the pump does not run dry. The pump is now protected against internal corrosion and frost.

Service

6.1 Periodic maintenance
The APP pump is designed so that lubrication follows from the water itself and there is thus no oil in the pump.
The pump requires no periodic replacements of seals and valve parts.

6.2 Repair
In case of irregular function in the pump, please contact Danfoss High Pressure Pumps.

Danfoss A/S
High Pressure Pumps
DK-6430 Nordborg
Denmark

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This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed.
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