Pump control Presflo VARIO pressure switching - PEDROLLO

PRESSFLO VARIO - ELECTRONIC PUMP CONTROLLER - PEDROLLO

PRESFLO® is a device that starts and stops the pump to which it is fitted, thus replacing traditional pressure switch / surge tank systems. The pump is started when, as a tap is turned on, the pressure within the system drops below the “start-up pressure” (Pm), and is stopped when the flow  rate required is zero or less than the “shut-off flow rate” (Qa). The running pressure (Pm) is mechanically adjustable via knob.

PRESFLO®’s electronics protect the pump against unsuitable operating conditions such as dry running or repeated startups due to leaks.

Technical Specification

- Voltage: ~230 Volt / ~115 Volt
- Frequency: 50-60 Hz
- Current: 12A, max 16A for 3 sec.
- Protection grade: IP 65
- Start-up pressure (Pm): 0,8 ‹–› 2,4 bar  (12 à 35 psi)
- Shut-off flow rate (Qa): 2 litres/min (0,5 gpm)
- Connections: 1” BSP / 1” NPT
- Maximum working pressure: 10 bar (145 psi)
- Bursting pressure: 40 bar (580 psi)
- Weight: 650 g
- Protection against:
- dry running (automatic restart)
- repeated start-ups
- Max room temperature: 40°C
- Max liquid temperature: 55°C
- Type of drive: 1C
- Max manual operations on push button: 1000
- Max automatic operations on relay: 100000
- Class 3A PTI
- Pollution degree : 2
- Max rated voltage pulse: 2,5 kV
- 230V 12A for EMC test
- Pressure operating  differential: 10 bar

Before installing or using PRESFLO®, read this manual carefully and thoroughly. The pump should be installed and serviced by qualified personnel, responsible for making the hydraulic and electrical connections in compliance with
the relevant regulations. PRESSFLOW® shall not be held liable for any damage relating to, or resulting from, an improper use of the product, or for any damage relating to, or resulting from, servicing or repairs carried out by unqualified personnel and/or with non-OEM spare parts.

The warranty, which is valid for 24 months from the date of purchase, will no longer be applicable should the product suffer damage as a consequence of the use of non-OEM spare parts, tampering or improper use. When starting the installation, check the following:

- the power supply is switched off.
- the power lines can withstand the maximum current.
- the cable bushings and circuit board cover have been properly assembled and secured ( see Electrical Connections ).
- Power supply network must be fitted with proper protection device (fuse or magnetothermal relay) upstream of PRESFLO®

When servicing the product, check the following:
- the system is not pressurised (turn a tap on)
- the power supply is switched off.

Emergency Stop

When in use, the pump can be stopped in the event of an emergency: press STOP/RESTART

ORIENTATION PRESSFLO VARIO

PRESFLO® can be installed at any angle depending on the flow direction.

POSITION PRESSFLO VARIO

PRESFLO® can either be fitted directly to the pump outlet or anywhere along the delivery line. Never install taps between the pump and PRESFLO®. Do not install a non-return Valve between PRESFLO® and the taps, meanwhile it is possible, although not necessary, to install a non-return valve on the suction piping of the pump.

The pressure applied by the water column above PRESFLO® must not exceed that of the pump start-up pressure (Pm). If, for example, PRESFLO® is installed at a height 18 m (60 ft) below that of the highest tap in the system, the pressure detected by PRESFLO® will be approximately 1,8 bar (25 psi). A change to Pm = 2.4 bar (35 psi) should, therefore, be applied in order to guarantee that the pump is started when a tap is turned on.

The maximum pressure produced by the pump must be at least 1 bar (15 psi) higher than the start-up pressure (Pm). If the pressure produced by the pump is too low, PRESFLO® will stop the pump and indicate a ‘dry running’ error message.

When the pressure in the system drops below the Pm, PRESFLO starts the pump. The Pm must be greater at least 0.5 bar than the pressure generated by the water column overlying PRESFLO. The value of Pm can be varied in the
range between 0.8 and 2.4 bar, incrementally, by turning the adjustment knob clockwise to increase the Pm, and counterclockwise to reduce Pm.

Factory configuration:

PRESFLO is supplied with the following standard configuration:
Running pressure: Pm = 1.5 bar
Hydraulic connections the joint in two pieces allows rapid connection to the system.
DO NOT apply sealant inside the 2-piece joint because it already has an internal o-ring