10
Hydraulic circuit accessories
The "(S)" symbol indicates that the option is present as standard in the unit, provided this is not in conflict with other
selected accessories.
CORM Connection for manual filling
This accessory allows the system filling procedure to be carried out directly from the unit: on the fan holder
cover, there is a 1’’ filling valve and a 1/2’’ air valve. Near the filling valve, there is also a pressure gauge for
displaying the pressure in the hydraulic circuit. This accessory can be combined only with units provided with
tank.
FVP
FLOWZER VP - Inverter for manual pump adjustment
The accessory consists of inserting an inverter in the machine to manually adjust the speed of the pump (or
pumps) in order to calibrate the pump flow rate on the head losses of the system.
This accessory is to be combined with one of the integrated hydraulic modules that can be selected for the unit.
Units equipped with integrated hydraulic module allow a certain level of available discharge head (point A) to
be obtained under nominal flow rate conditions Q
d
.
But the actual head loss level of the system (e.g. characteristic curve R') normally causes the pump to find a
different equilibrium point (point B), with a flow rate Q
r
higher than Q
d
.
In this condition, besides having a different flow rate from the nominal flow rate (and therefore also a different
thermal gradient), there is also higher pump power absorption.
Q
r
Q
d
Q [l/s]
n’
Q
min
n
Q
max
H
AV
[k
Pa
]
n
n’
Pa
[k
W
]
Q [l/s]
R
R’
Q
d
Q
r
A
B
C
A
B
C
The use of the Flowzer allows the pump speed to be set manually (e.g. at speed n' instead of n) to obtain the
design water flow rate and thermal gradient (point C).
Once the adjustment procedure has been carried out, the pump will always work at a fixed flow rate.
Use of the Flowzer VP allows the power absorption of the pump to be considerably reduced with consequent
energy saving. By way of example:
•
a 10% reduction in flow rate gives a reduction in absorbed power of about 23%
•
a 30% reduction in flow rate gives a reduction in absorbed power of about 50%
