Danfoss 060-001366 KP 44 Dual Pressure Switch G1/4

KP 44: one housing, two pressure inputs for pump control and dry-run protection

Danfoss 060-001366 is the KP 44 dual pressure switch. Two bellows, two spindles and two G 1/4 connections sit inside one IP22 housing, so a single device can watch two pressures or two points of the same system. The Danfoss KP/KPI data sheet singles out the KP 44 for water pump control and protection against dry running, where it improves pump lifetime.

The left side is set between 2 and 12 bar with an adjustable differential of 0.7 to 4 bar, the right side between 0.5 and 6 bar with a fixed 1 bar differential. The contact system is one normally open and one normally closed single-pole contact, one per side, and both sides reset automatically.

Technical specifications

Typical applications and wiring logic

In a pressure booster set the left side can hold the pump on its running window while the right side monitors the suction pressure and opens the contact when inlet pressure falls below the minimum. Because the two contacts are independent, they can be wired in series with the motor starter coil or one can feed an alarm lamp.

Check the figures from the installation guide for the KP 44: control and safety sides carry a PS/MWP of 17 bar, with test pressures of 19 and 25 bar, and the permitted ambient range is -40 to 65 C. Do not mount the switch where dirt, sediment or oil can reach the mechanism, and keep the mounting panel flat so the housing is not stressed.

Selection and order checks

This code is one of several dual-switch versions, so verify the exact ranges on the label of the old unit if you are replacing a KP 44: the values above are specific to 060-001366. Gold-plated and manual-reset variants are not this code. Cable entry and mounting position should be confirmed against the guide before drilling the panel.

Seven Star LLC is an independent supplier in Muscat. Send us the code 060-001366, quantity and the location and we will check availability and supply terms.

Projects that use 060-001366 often need related parts from the same manufacturer, such as connectors, mounting parts or spare kits. Mention them in the same enquiry so that compatibility can be checked together rather than discovered on site, when a missing part stops the work.

Choosing set points for the two sides

Before the KP 44 is installed, decide what each side of the switch has to do. In a typical booster or transfer pump arrangement the left side, with its 2 to 12 bar range and adjustable differential, handles the running window on the discharge, while the right side, with its 0.5 to 6 bar range and fixed 1 bar differential, acts as the low-pressure or dry-run cut-out. Write down the cut-in and cut-out pressure required for each duty and confirm that both values fall inside the range of the side that will serve them.

Remember that the differential on the right side cannot be changed. If the process needs a narrower or wider reset band at low pressure, the application should be reviewed before the order is placed. Also check that the highest pressure the system can reach, including pump shut-off head and any surge, stays below the 17 bar PS/MWP given for this switch.

Mounting and pipe connection

Fit the switch on a flat, vibration-free panel or bracket close to the measuring points, and connect each G 1/4 port with a suitable impulse line. Long or thin lines slow the response, while a line that collects sediment can stop the bellows reacting at all, so route the connections to stay clean and allow venting. On pump sets with strong pressure pulsation, a damping device in the impulse line is commonly used to protect the bellows and reduce contact chatter.

Follow the Danfoss installation guide for the cable entry and electrical connection, and use cable glands that keep the IP22 rating meaningful in the location chosen. Isolate the supply before opening the cover and keep the wiring diagram for each contact inside the panel documentation.

Commissioning and functional test

Set the range spindles to the planned values, then confirm the actual switching points with a calibrated gauge on the same line rather than relying on the scale alone. Raise and lower the pressure slowly on each side, note the pressure at which each contact changes state, and adjust in small steps. For the dry-run function, simulate low suction pressure where it is safe to do so and check that the pump stops and does not restart until pressure has recovered by the differential.

Working conditions in Oman and the Gulf

The ambient range of -40 to 65 °C covers most pump rooms, but switches mounted in direct sun on rooftop tanks or desert well sites can run hotter than the surrounding air. A shaded location or a simple protective enclosure keeps the housing cooler and reduces dust entry, which matters because the enclosure is only IP22. In humid coastal areas, check for condensation and corrosion on terminals during routine inspections, and verify the set points at regular intervals, especially after pump or valve work on the system.

Documents and quotation

We attach the Danfoss installation guide for the dual pressure switch type KP 44 (AN109786435044), which shows the internal layout, ambient limits and test pressures quoted above. Other switches and transmitters are listed in pressure instrumentation.