Danfoss APP 06-10 Pump Pure Aqua Instruction Manual
- June 17, 2024
- Danfoss
Table of Contents
Instruction
APP pump instruction
APP 0.6-1.0, APP 1.5-2.5 and
APP 3.0-3.5
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.
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).
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.
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.
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.
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.
3.5 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.
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
Danfoss can accept no responsibility for possible errors in catalogues,
brochures and other printed material. Danfoss reserves the right to alter its
products without notice.
This also applies to products already on order provided that such alterations
can be made without subsequential changes being necessary in specifications
already agreed.
All trademarks in this material are property of the respective companies.
Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights
reserved.
References
- Manual-Hub.com - Free PDF manuals!
- Sustainable Desalination with SWRO Technology | Danfoss
- Manual-Hub.com – Free PDF manuals!