16
English
6 - WaTer connecTIonS
6.1 - hydronic module (fig. 9/10)
The EREBA units are equipped with an integrated
hydronic module with a variable flows pump self-
controlled that allows fast installation with the aid of a few
external components.
Refer to Figure 9 for the exact connection of the water
pipes. Figure 10 describe the integrated components in
their various configurations.
nOTe: The correct dimensioning of the expansion vessel
is left to the installer as a function of the type of plant.
nOTe: The discharge of the safety valve can be
channelled to the outside of the machine using the
pre-cut holes (see Fig. 4). In this case, it is necessary to
provide an open drain funnel.
Size 004-006-008
Size 012-015
The operating red knob allows to set several pressure levels in 2 control modes :
- Variable differential pressure (Δp-v)
- Constant differential pressure (Δp-c)
The user interface allows to select between 6 pressure levels in 2 control modes:
- 3 constant pressure/power curves (CP)
- 3 proportional pressure curves (PP)
Min flow=1 ; Max flow=3
‘‘Set Up’’ procedure :
‘‘Set Up’’ procedure :
Factory pre-setting = Δp-c 8.
All functions can be set, activated or deactivated by using the operating red
knob:
- The control mode Δp-v is set on the left of the middle position (from 1 to 8).
- The control mode Δp-c is set on the right of the middle position (from 1 to 8).
- For venting the pump, turn the knob in its middle position (the venting
function is activated after 3 seconds and lasts 10 minutes before going to
Δp-c max mode).
1) Factory pre-setting
Constant Pressure Curve CP3
2) Push the button 10 sec
Pump goes to setting mode - LED
starts flashing
3) With each push the setting changes
LED 1-2-3 shines / control curve and
mode is changing
4) After 10 sec not pushing the button
Setting is adapted – pump goes back
to operation mode
5) LED 1 or 2 or 3 is permanently
shining
Pump is running with the selected
curve and mode
NOTE:
- The variable pressure mode (Δp-v or PP) is recommended in heating systems with radiators.
- The constant pressure mode (Δp-c or CP) is recommended for underfloor-heating circuits.
- All hydronic curves (Fig. 14) have been defined in constant pressure mode for min, medium and max speed.
Variable differential pressure (Δp-v)
Constant differential pressure (Δp-c)
Venting function
PP1 (flashing fast)
PP2 (flashing fast)
PP3 (flashing fast)
CP1 (flashing slow)
CP2 (flashing slow)
CP3 (flashing slow)
6.2 - Water connections (Fig. 12)
Make the plate heat exchanger hydraulic connections
with the necessary components, using material which will
guarantee that the screwed joints are leak-proof. The
figures 11 shows a typical water circuit installation.
For an application with a water circuit, the following
recommendations must be taken into account:
1. The external circulation pump must be installed in the
return water pipe work immediately before the heat
pump (unit without hydraulic module).
2. It is advisable to install shut-off valves to allow
isolation of the most important circuit components, as
well as the heat exchanger itself.
These valves (ball, globe or butterfly valves) should
produce a minimum pressure drop when they are
open.
3. Provide unit and system drains at the lowest system
point.
4. Install purges in the higher sections of the installation.
5. Pressure ports and pressure gauges should be installed
upstream and downstream of the external water
pump.
6. All piping must be adequately insulated and
supported.
Installation of the following components is obligatory:
1. The presence of particles in the water can lead to
obstructions in the heat exchanger.
It is therefore necessary to protect the heat exchanger
inlet with an extractable mesh filter. The filter mesh
gauge must be at least 10 mesh/cm
2
.
2. After assembling the system, or repairing the circuit,
the whole system must be thoroughly cleaned with
special attention paid to the state of the filters.
