OPERATING AND MAINTENANCE MANUAL
Chapter 5 - Installation
iC 215 ÷ iC 780
26
The data in this manual are not binding and they can be modified by the manufacturer without notice.
Reproduction of this manual is strictly prohibited
ENGLISH
EN
5 . 5
E x p a n s i o n v e s s e l
In the presence of a closed hydraulic circuit an expansion vessel must be installed.
The expansion vessel must always be installed on the pump suction side.
To calculate the minimum volume of the expansion vessel use the formula shown below, which is valid if the circuit pressure
is less than or equal to 0.5 bar when the pump is idle and the maximum working pressure of the expansion vessel is greater
than or equal to 4 bar.
The volume of expansion vessel V in litres is provided by the formula:
V = 2 · Vt · (Ptmin - Ptmax)
where:
Calculation example:
Vt
=200 litres
percent ethylene glycol by volume=30%
tmin=5°C from table
Ptmin
=(1.045+1.041)/2 = 1.043
tmax=40°C from table
Ptmax
=1.0282
V=2 · 200 · (1.043 - 1.0282)=5.92 litres
When filling the circuit with liquid check to ensure the absence of air
bubbles and contaminants. If the pump runs noisily or emits anomalous noise
it may be necessary to bleed the liquid circuit in order to prime the pump.
The procedure is as follows:
•
unscrew the filler/breather plug at the top of the pump
•
fill the hydraulic circuit until water starts to overflow from the
filler hole
•
refit the plug and tighten it
Repeat the operation if the pump continuous to run noisily, in such a way as
to eliminate any air that had previously remained trapped in the impeller
vanes.
In iC 520÷535 models, special care must be taken if two pumps are fitted.
Proceed to prime the pumps, checking especially the one located at the
greatest height from the ground.
In iC 640÷660 models, fill the system as in single pump models, taking care
to ensure that both pumps are properly primed.
In iC 538÷540 and iC 770÷780 models, fill the system as in single pump
models, taking care to ensure that both pumps are properly primed.
Vt=
Total circuit volume in litres
Ptmin=
Specific density at minimum temperature that can be reached by the water throughout a twelve month
period expressed in °C (also during system shutdown)
Ptmax=
specific density at minimum temperature that can be reached by the water throughout a twelve month
period expressed in °C (also during system shutdown)
PLUG