Lowara Hydrovar FCH - FCTH Controls

FCH-FCTH SERIES ELECTRIC PUMPS WITH HYDROVAR® AND HYDROVAR® SENSORLESS CONTROL SYSTEM

We recommend the use of the FC-FCT series electric pumps combined with the HYDROVAR® and HYDROVAR®
Sensorless devices.
HYDROVAR® and HYDROVAR® Sensorless are microprocessor controlled devices for pumping systems, designed to control pump operation according to system conditions and requirements.
This way the simple electric pump is transformed into a complete pumping system principally designed for airconditioning and heating applications, adapting the differential pressure of the closed circuit to the requested load.

• No special pumps or motors: HYDROVAR® is mounted directly onto a standard three-phase TEFC motor with class F insulation up to 22 kW power. (HYDROVAR® Sensorless up to 4 kW).

• HYDROVAR® Sensorless enables the control of an electric circulator pump by monitoring the power control, without requiring a differential pressure transmitter.

• No separate control panels or converters: HYDROVAR® and HYDROVAR® Sensorless, perform all the functions of a pump control panel, incorporating protections against overload, short circuit, high temperature, etc. The obly external device required is a fuse on the power supply line. Will depend upon any local electrical installation regulations.

• No by-pass lines or safety systems: With HYDROVAR® the pump switches off immediately when demand is zero or exceeds the maximum capacity of the pump. This way there is no need to install additional safety devices.

• The pump’s operation at the correct speed based on system requirements enables energy consumption to be substantially reduced.

GENERAL OPERATING PRINCIPLES OF THE HYDROVAR® SYSTEM

The basic function of the HYDROVAR® device is to control the pump to meet the system demands.
For the FC and FCT series electric pumps, typical operation consists in system regulation based on the characteristic curve (B).
HYDROVAR® performs these functions by:
1) Measuring the system pressure or flow via a transmitter mounted on the pump’s delivery side.
2) Calculating the motor speed to maintain the correct flow or pressure.
3) Sending out a signal to the pump to start the motor, increase speed, decrease speed or stop.
4) In the case of multiple pump installations,
HYDROVAR® will automatically provide for the cyclic changeover of the pumps’ starting sequence

In addition to these basic functions, HYDROVAR® can do things only by the most advanced computerised control systems, such as:

• Stop the pump(s) at zero demand.

• Stop the pump(s) in case of water failure on the suction side (protection against dry running).

• Stop the pump if the required delivery exceeds the pump’s capacity (protection against cavitation caused by excessive demand), or automatically switch on the next pump in a multiple series.

• Protect the pump and motor from overvoltage, undervoltage, overload and earth fault.

• Vary the pump speed acceleration and deceleration time.

• Compensate for increased flow resistance at high flow rates.

• Conduct automatic test starts at set intervals.

• Monitor the converter and motor operating hours.

• Display all functions on an LCD in different languages (Italian, English, French, German, Spanish, Portuguese, Dutch).

• Send a signal to a remote control system which is proportional to the pressure and frequency.

• Communicate with another HYDROVAR or control system via an RS 485 interface.