Danfoss PAHT G 20, PAHT G 25, PAHT G32, PAHT G 50, PAHT G 63 Installation guide
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Instruction
Instruction
Pump instruction
PAHT G pumps
PAHT/PAHT G 20-32 and
PAHT G 20/25/32 and
PAHT G 50/63/70/80/90
PAHT/PAHT G 50-90
danfoss.high-pressurepumps.com
hpp.danfoss.com
Instruction Pump instruction PAHT G 20-32 and PAHT G 50-90
Table of Contents
1. Identication ...........................................................................3
2. System design ..........................................................................3
2.1 Closed water hydraulic systems, water recirculated ......................................3
2.2 Closed-system design ..................................................................3
2.3 Open-ended systems, water supply from tank ...........................................4
2.4 Open-ended systems with direct water supply...........................................4
2.5 Open-system design ....................................................................4
2.6 guidelines for calculation of pressure losses ...........................................6
3. Building up the pump unit ..............................................................6
3.1 Mounting...............................................................................6
3.2 Direction of rotation ....................................................................7
3.3 Orientation .............................................................................7
3.4 Protection from too high system pressures ..............................................7
3.5 Connections ............................................................................8
3.5.1 PAHT G 20-32 ...........................................................................8
3.5.2 PAHT G 50-90...........................................................................8
4. Initial start-up ...........................................................................9
5. Operation...............................................................................9
5.1 Water quality ...........................................................................9
5.2 Temperature............................................................................9
5.3 Pressure ................................................................................9
5.4 Dry running............................................................................10
5.5 Disconnection .........................................................................10
5.6 Storage ................................................................................10
5.6.1 Water hydraulic systems, water recirculated.............................................10
5.6.2 Open-ended systems with water supply from tank. .....................................10
5.6.3 Open-ended systems with direct water supply. .........................................10
6. Service.................................................................................10
7. Recommended service intervals........................................................11
7.1 General information....................................................................11
7.2 Inspection of pump parts ..............................................................11
7.3 How to inspect the pump ..............................................................11
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180R9381 | AN077186502937en-000401 | Instruction PAHT G 20-90 | 08.2020
Instruction Pump instruction PAHT G 20-32 and PAHT G 50-90
1. Identication
PAHT G
Protective cap must be removed
and thrown away before usage.
2. System design
Systems can be either:
• Water hydraulic systems, in which the water
is recirculated back to tank.
• Open-ended systems with water supply
from a tank.
• Open-ended systems with direct watersupply (boosted pressure).
The design of the system must ensure that
selfemptying of the pump during standstill is
avoided.
The minimum boost pressure is 2 barg (29 psig)
and the maximum peak pressure is 20 barg
(290 psig). The recommended normal boost
pressure is 2-6 barg (29-87 psig) (3-7 barg
[43.5-101.5 psig] abs).
2.2 Closed-system design
A Inlet line:
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).
B Inlet filter:
Install the inlet lter (1) in front of the tank
(2). Place the tank above pump and pump
inlet. Please consult the Danfoss lter data
sheet for guidance on how to select the
right lter.
C Monitoring pressure switch:
Install the monitoring pressure switch (3) in
front of the lter (1). Set the maximum inlet
pressure to 2 barg (29.0 psig). The monitoring pressure switch will stop the pump (5) if
inlet pressure is higher than 2 barg
(29.0 psig), indicating that the lter element
must be changed.
D Monitoring temperature switch:
Install the monitoring temperature switch
(4) in the tank. Set the temperature value
according to technical data, item 4. The
monitoring temperature stops the pump if
inlet temperature is higher than the set
value.
If it is unknown what the peak inlet pressure can
be, then there should be a 15 barg (218 psig)
safety relief valve on the inlet side of the pump.
Note: All mentioned pressures refer to
measures in the respective pump gauge ports.
The inlet pressure of the pump must never
exceed the outlet pressure. This may typically
occur in boosted or open-ended systems with
supply direct from the tap and where a bypass
valve is activated.
2.1 Closed water hydraulic systems, water
recirculated
(The numbers 1- 3 refer to the drawing below ).
In order to eliminate the risk of cavitation, always
ensure a minimum inlet pressure of 0 barg
(0 psig) (1 barg [14.5 psig] abs) by observing the
following guidelines:
E Hoses:
Always use exible hoses (6) to minimize
vibrations and noise.
F Inlet pressure:
In order to eliminate the risk of cavitation
and other pump damage, pump inlet
pressure must be maintained according to
specications described in item 4, technical
data.
G Non-return valve (7):
Should be installed after the outlet to
prevent pump backspin, which may ruin
the pump.
H Pressure relief valve:
As the Danfoss PAHT pump begins to
create pressure and ow immediately after
start-up regardless of any counter pressure,
a pressure relief valve (8) should be
installed to prevent system damage.
I System water filling:
To ensure proper ltration of new water
(10) supplied to the system, always use the
lling valve (9).
J Minimum level switch:
Install the minimum level switch (11) above
the outlet of the reservoir. The level switch
must stop the pump if the water in the
reservoir is below the switch, which
indicates that the reservoir is empty.
180R9381 | AN077186502937en-000401 | Instruction PAHT G 20-90 | 08.2020
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Instruction Pump instruction PAHT G 20-32 and PAHT G 50-90
2.3 Open-ended systems, water supply from
tank
(The numbers 1-3 refer to the drawing below ).
In order to eliminate the risk of cavitation, always
ensure a minimum inlet pressure of 0 barg
(0 psig) (1 barg (14.5 psig) abs) by observing the
following guidelines:
1) Place the tank above the pump (water level
in the tank should always be above the
pump).
2) Place the inlet lter before the tank.
2.4 Open-ended systems with direct water
supply
The pump is supplied with water direct from the
water supply or from a booster pump.
Recomended normal boost pressure is 2-6 barg
(29-87 psig) (3-7 barg [43.5-101.5 psig] abs).
The inlet line connection must be properly
tightened, as possible entrance of air will cause
cavitation.
2.5 Open-system design
A Inlet line:
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).
B Inlet filter:
Install the inlet lter (1) in front of the PAHT
pump (2). Please consult the Danfoss lter
data sheet for guidance on how to select
the right lter.
C Monitoring pressure switch:
Install the monitoring pressure switch (3)
between the lter and the pump inlet. Set
the minimum inlet pressure according to
specications described in item 4, technical
data. The monitoring pressure switch stops
the pump if inlet pressure is lower than the
set minimum pressure.
D Monitoring temperature switch:
Install the monitoring temperature switch
(4) between the lter and the pump, on
either side of the monitoring pressure
switch. Set the temperature value according to technical data, item 4. The monitoring temperature switch stops the pump if
inlet temperature is higher than the set
value.
E Hoses:
Always use exible hoses (5) to minimize
vibrations and noise.
F Inlet pressure:
In order to eliminate the risk of cavitation
and other pump damage, pump inlet
pressure must be maintained according to
specications described in item 4, technical
data.
G Non-return valve (6):
Should be installed after the outlet to
prevent pump backspin, which may ruin
the pump.
H Pressure relief valve:
As the Danfoss PAHT pump begins to
create pressure and ow immediately after
start-up regardless of any counter pressure,
a pressure relief valve (7) should be
installed to prevent system damage.
Note: If a non-return valve is mounted in the
inlet line, a low-pressure relief valve is also
required between the non-return valve (8) and
the pump to protect against high-pressure
peaks.
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180R9381 | AN077186502937en-000401 | Instruction PAHT G 20-90 | 08.2020
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