CIAT Ereba He Series, Instruction Manual

Page: 24 / 96

EREBA He
EN-24
2 - INSTALLATION OF UNIT
2.3.3 - Minimum water loop volume
The minimum water loop volume, in litres, is
given by the following formula:
Volume (l) = CAP (kW) x N
Where CAP is the nominal cooling capacity
at nominal operating conditions.
Application N
Air conditioning 3,5
Heating or domestic hot water application 6
Industrial process cooling See note below
Note: For industrial process cooling applications, where high stability of
water temperature levels must be achieved, the values above must be
increased.We recommend consulting the factory for these particular
applications.
This volume is required to obtain temperature
stability and precision. To achieve this volume,
it may be necessary to add a storage tank to
the circuit. This tank should be equipped with
baffles to allow mixing of the fluid (water or
brine). Please refer to the examples below.
Good Bad
Bad Good
2.3.4 - Maximum water loop volume
Units with hydraulic module incorporate an
expansion tank that limits the water loop
volume. The table below gives the maximum
loop volume for pure water or ethylene glycol
with various concentrations.
If the total system volume is higher than the
values given above, the installer must add
another expansion tank, suitable for the
additional volume.
Water maximum volume (L)
EREBA He
Static pressure (bar) 1,5 3
Fresh water 200 50
Ethylen glycol 10% 150 38
Ethylen glycol 20% 110 28
Ethylen glycol 30% 90 23
Ethylen glycol 40% 76 19
2.3.5 - Hydraulic circuit
Figure 7: Typical diagram of the hydraulic circuit with the hydraulic module
1
1
2
3
3
4
6
5
7
8
9
Legend:
1 Shut-off valves 2 Line filter for water 3 Pressure gauges
4 Filling valve 5 System drain valve 6 Air flushing valve
7 3-way valve 8 Sanitary water accumulation tank 9 Inside system
The use of the hydraulic
module on open loop is
prohibited.