Grundfos Pressure Manager
10
Selection
Selection of Pressure Manager
The following helps determine which Pressure Manager
type to select for a given application.
Functions
The PM 1 and PM 2 share some of the same functions,
but the PM 2 offers some additional functions. Among
other things, the start pressure for the PM 2 is
adjustable.
For further information about Functions, see page 9.
Features
A comparison of the features of the PM 1 and PM 2 can
be found in section Features on page 3 where the main
features are also described.
Technical data
The Technical data for the PM 1 and PM 2 can be found
on page 13. The maximum contact loads must be
observed when selecting a PM 1 or PM 2. Furthermore,
the height (H) between the PM unit and the highest
tapping point must not exceed the values in the table
below. See also fig. 8 on page 8.
Selection of pressure tank
Be aware that in systems where small leakages may
occur, a small pressure tank might be required in order
to minimise the number of starts and stops of the pump.
Recommended pressure tank:
PM 1
In systems with a very small consumption, the above-
mentioned pressure tank can be fitted to reduce the
number of starts/stops of the pump.
PM 2
The PM 2 has an internal pressure tank with a capacity
of 0.1 litre which reduces the number of starts/stops of
the pump when there is a very small consumption in the
system. To further reduce the number of start/stops of
the pump, an external pressure tank can be installed.
Tank sizing for PM 2
The PM 2 can be set up for operation with 1 bar
differential pressure, which reduces the pump
operating time. When this operating mode is used,
a pressure tank must be installed.
To find the correct size of the pressure tank, follow the
guidelines below:
The size of the tank can be determined on the basis of
the selection curves in fig. 9.
The selection curves are based on these values:
• Differential pressure Δp = 1 bar
• Number of starts/stops per hour = 20
• Precharge pressure = start pressure x 0.9 bar.
Sizing example
See fig. 9.
• Estimated consumption = 4 l/min.
(point A on the x-axis)
• Start pressure = 3 bar
(point B on the y-axis)
• An 18-litre pressure tank is suitable
(point C).
Fig. 9 Pressure tank selection curves
For further information about available tanks, see the
GT data booklet available in WebCAPS. See section
Further product documentation on page 10.
PM type and variant
PM 1 PM 2
1.5 bar 2.2 bar 1.5 - 5 bar
Max. height (H) between
PM unit and highest
tapping point
10 metres 17 metres 45 metres
Type
Size
Max.
pressure
Pre-
charge
pressure
Connection
Product
number
[l] [bar] [bar]
GT-H-8 V 8 10 1.5 1" 96526321
TM04 4924 2209
00.08 0.10.1 0.15 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 11 1.5 2 3
Q [m³/h]
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
[bar]
p
2 3 4 5 6 7 8 9 1010 20 30
Q [l/min]
24 l 80 l8 l 12 l 18 l 33 l 60 l 100 l
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