Danfoss PAH 2, Installation, Operation And Maintenance Manual

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Instruction Pump instruction PAH / PAHT 2-12.5
40 | © Danfoss | DHS (im) | 2022.07 1180R9379 | AQ188686503004en-000801 | PAH 2-12.5
4. 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 .
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 .
5.1 Water quality
Water of drinking water quality, confirming to
the EEC directive 98/83/EC and without abrasive
sediments . Please contact Danfoss sales
organization in case of doubt .
5.2 Temperature
In case of lower operating tempera tures, please
contact the Danfoss Sales Organization .
5.3 Pressure
The inlet pressure must be between min . 0 barg/
0 psig and max . 4 barg/60 psig . The use of pump
outside this range damage the pump .
Max . pressure on the pump’s outlet line should
be limited at 140 barg (2030 psig) continuously .
NB: The pump unit should include a pressure
gauge on the high pressure side .
5.4 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 .
5.5 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 .
5.6 Storage
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
the Danfoss Sales Organization .
Recommended procedure
5.6.1 Water hydraulic systems, water recircu-
lated
1 . Disconnect the power pack from the
system .
2 . Empty the tank of water . Fill up the tank
with anti-freeze medium to a level well
above the suction line .
3 . Start up the power pack and, for a couple
of minutes, in a closed loop system let the
anti-freeze medium run back to tank
through the pressure relief valve or the
bypass valve .
4 . Empty the tank of the anti-freeze medium .
Empty the pump through the lower
bleeding plug .
The pump is now protected against internal
corrosion and frost .
5. Operation
Fluid
temperature
Min . +2° C to
max . +50° C
Ambient
temperature
Min . 0° C to
max . 50° C
Storage
temperature
Min . -40° C to
max . +70° C