Pipe water content
Internal Diameter Outer diameter Liters / meter
Copper
12 mm 14 mm 0.11 l/m
14 mm 16 mm 0.15 l/m
16 mm 18 mm 0.20 l/m
20 mm 22 mm 0.31 l/m
25 mm 28 mm 0.49 l/m
32 mm 35 mm 0.80 l/m
Steel
‘‘12.7 mm (1/2’’)’’ 3/8’’ Gas 0.13 l/m
‘‘16.3 mm (5/8’’)’’ 1/2’’ Gas 0.21 l/m
‘‘21.7 mm (7/8’’)’’ 3/4’’ Gas 0.37 l/m
‘‘27.4 mm (11/16’’)’’ 1’ Gas 0.59 l/m
Unit
EREBA
004_ 006_ 008_ 012_ 015_
Std l/s 0.20 0.28 0.33 0.58 0.69
Water content
expansion vessel
Min l 14 21 28 42 49
Max l 65 65 65 95 95
Working pressure
Max kPa 300 300 300 300 300
Filling pressure
Min kPa 120 120 120 120 120
Diference in level
with unit at lowest
level
Max m 20 20 20 20 20
% Inhibited Ethylene
Glycol
10% 20% 30% 40%
Freezing
temperature(*)
-4 °C -9 °C -15 °C -23 °C
Correction
Factors
Capacity 0.996 0.991 0.983 0.974
Absorbed power 0.990 0.978 0.964 1.008
Loss of head 1,003 1,010 1,020 1,033
(*) NOTE: Temperature values are indicative.
Always refer to the temperatures indicated for the speciic product used
TABLE TO USE FOR CALCULATING
Installed Unit .............
Unit content (*) l .............
Pipe content (**) l .............
Uses (fan-coil, panels, radiators, etc.) (***) l .............
Total content (****) l .............
(*) Consult the technical data table
(**) Consult the pipe water content table
(***) Consult the manual for the installed uses
(****) The water content of the system must be greater than the minimum value for
units without hydronic kit. The minimum value is necessary to provide optimal
comfort.
3. Pump ow rate control is made through a ow control
valve, which must be installed on the delivery pipe
during installation.
4. When water has to reach temperatures below 5°C, or
the equipment is installed in areas subject to
temperatures below 0°C, it is necessary to mix water
with inhibited ethylene glycol in suitable quantity.
Anti-seizing pump
The EREBA units are equipped with protection against
the seizing of the pump motor shaft. To allow this function,
do not empty the system or disconnect the power during
long periods of inactivity.
In any case, if the pump rotor shaft seizes after a long
period of inactivity, the user must do the following to
unblock it:
- Disconnect the power.
- Remove the front panel.
- Unscrew the shaft-protection plug on the back of the
pump.
- Insert a screwdriver in the slot and turn the rotor
shaft.
- Remount the protection plug.
- Reconnect the power.
System cleaning and water characteristics
In the case of a new installation, or cleaning the circuit, it
is necessary to perform a preventive cleaning of the
system.
In order to guarantee the good operation of the product,
each time you clean the system, replace the water or add
glycol, check that the liquid appears clear, without visible
impurities and that the hardness is less than 20 °f.
See g. 12.
Anti-freeze protection
If unit is switched off during the winter period when
outdoor air temperatures below 0°C can occur and
ethylene glycol is not used, it is recommended that the
entire system is drained through the drain unit valve, Fig 9,
item 3, and the system drain, Fig 11, item 5.
6.3 - Recommended water diagram (Fig. 11)
For typical water circuit diagram for EREBA unit
see g 11.
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