Xylem hydrovar, Installation, Operation And Maintenance Manual

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3.2 Product function and use
Description
HYDROVAR is a pump-mounted variable speed, microprocessor-based system controller.
It can be mounted onto virtually any model of fan cooled motor and is simple to integrate
into BMS systems with ModBus or Bacnet communication as standard.
In a variable speed controlled system, the pump works every time with the speed where it
produces at the reduced flow exactly the required head. Therefore there is no wasted
energy given to the system like on/off or bypass control.
Intended use
HYDROVAR is made for the following pump applications:
• Pressure, level, and flow regulation
• Closed loop systems
• Irrigation applications with single or multiple pumps
Improper use
The product must not be used for constant torque applications.
Approvals and certifications
The unit complies with UL508C thermal memory retention requirements.
3.3 Applications
Application alternatives
The application alternatives for the product are the following:
• Actuator
• Controller
• Cascade serial / Synchronous
• Cascade relay
3.3.1 Actuator
This mode is used for a unit in a single pump operation only. The unit operates as an
actuator according an external speed signal or continuous operation on either one or two
programmed frequencies. This is done by using the corresponding digital input.
3.3.2 Controller
This mode is set as the default operating mode and is used for a unit in a single pump
operation.
3.3.3 Cascade serial / Synchronous
In these applications, each of the pumps (up to eight pumps) must be equipped with a
unit.
The units are connected via the RS485 interface and communicate via the provided
protocol.
The combination of the different units which are used in a multi-pump-system depends on
the system requirements.
It is possible to run all pumps in cascade serial mode and synchronous mode as well. If
one unit fails, then each pump of the system can become the lead pump and can take
control.
3 Product Description
HVL 2.015-4.220 Installation, Operation, and Maintenance Manual 13