Italtecnica PM5 pressure switch 230 V, 16 A, 1–5 bar, 1/4" swivel nut

Mechanical pressure switch
230 V, max. 16 A
Adjustable 1 – 5 bar
1/4" female with swivel nut
Italtecnica, Made in Italy

€17.50

(VAT included)

In stock | Brand: ItalTecnica| EAN: 8032738641899

Since 2012

4.6 (Google reviews)

Free shipping · NL from €100 · BE/DE from €200

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Description

The Italtecnica PM5 is a mechanical pressure switch for booster sets with a single-phase 230 V pump up to max. 16 A. It starts the pump when the pressure drops and stops it again once the set pressure is reached. The switching pressure is adjustable between 1 and 5 bar. From the factory, the PM5 is set to 1.4 bar on and 2.8 bar off.

The pressure connection is a 1/4" female thread with a swivel nut and gasket. You don’t need to turn the switch itself: you screw the nut onto the 1/4" male thread of, for example, a 5-way connector, and the gasket makes the seal. No PTFE tape is needed. The PM5 is supplied without a cable.

How to set the PM5:

1. First unplug the pump or switch off the circuit breaker. The switch carries 230 V.
2. Undo the screw on top of the cover and remove the cover. You will see two springs: a large one and a small one.
3. The large spring sets when the pump switches on. Turn the nut on the large spring clockwise (tighter): the pump switches on sooner, at a higher pressure. Anticlockwise (looser): the pump switches on later, at a lower pressure. Note: the large spring also moves the cut-out pressure up or down with it.
4. The small spring sets how much higher the pump switches off. This gap is called the “differential”. Turn the nut on the small spring clockwise: the pump switches off at a higher pressure, so the gap gets bigger. Anticlockwise: the pump switches off sooner, so the gap gets smaller.
5. Turn half a turn to one full turn at a time, refit the cover, switch the power back on and read on the pressure gauge at which pressure the pump starts and stops. Repeat until the values are right.
6. Set the pressure vessel pre-charge 0.2 to 0.3 bar below the cut-in pressure. For example, if the pump starts at 2.0 bar, set the vessel to 1.7–1.8 bar.

A gap of 1 to 1.5 bar between on and off works well for most domestic installations.