ITT Hydrovar Operating Instructions

Operating Instruction
9
www.hydrovar.com
General information about the System
The Hydrovar-
Watercooled is suitable for constant pressure control of pumps and a
maximum system pressure of 6 bars. The variable speed drive can be used for service water,
water supply from a well or as a booster station. The requirement for using this variable
speed drive is a capable pump with an asynchronous motor suitable for a 3x230VAC supply
and isolation class F.
Mounting into the pressure line with pressure tank
For applications as water supply or booster with automatic shutoff it is necessary to mount a
check valve and a pressure tank.
To measure or control the actual system pressure it is necessary that the check valve is
mounted before the Hydrovar-
Watercooled .
The pressure tank can be mounted before or after the Hydrovar-
Watercooled or of the not
used pipe connection. Between pressure tank and Hydrovar- Watercooled it is not allowed to
mount a check valve or a pressure reduction valve to ensure storing the pressure in the system
at zero demand.
With the Hydrovar- Watercooled it is not necessary to have a large pressure tank for supply
purposes.
For selecting a pressure tank, make sure it is approved and suitable for the maximum system
pressure. The pressure tank should have a capacity of more than 10% of the maximum system
flow rate [l/min] of the pump.
Example:
Maximal capacity of the pump = 70 Liter per minute
Minimum volume of the pressure tank = 70x0.10 = 7 Liter
A certain pre-charge pressure has to be in the pressure tank when there is no water in the
tank, determined by the required pressure or the start value when activated.
Special application: Constant pressure control with external release contact:
For irrigation systems the Hydrovar-
Watercooled can be mounted without check valve and
pressure tank, if the Hydrovar-
Watercooled will be activated with an external release contact.
The Hydrovar-
Watercooled keeps the system pressure constant, while the external contact is
closed (irrigation is on) and is switched off by the external contact when the irrigation system
is not in use.
Solldruck / required
pressur
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ITT Hydrovar Specifications

General

Brand	ITT
Model	Hydrovar
Category	Inverter
Language	English